The ‘red-tailed’ Lasioglossum (Dialictus) (Hymenoptera: Halictidae) of the western Nearctic

Keywords: Apoidea, DNA barcodes, new species, revision, taxonomy


Sweat bees in the subgenus Lasioglossum (Dialictus) are one of the most diverse and abundant bee taxa, and a critically important component of bee biodiversity. Yet, the most basic taxonomic knowledge of these bees is lacking in many regions. As a step towards a better understanding of the L. (Dialictus) of the western Nearctic region, a revision of the ‘red-tailed’ L. (Dialictus) species was completed. Thirty-six species were revised, 20 of which are described as new, and two names are treated as junior subjective synonyms. Descriptions, figures, distribution maps, floral hosts, and keys to species for females and males are provided. The following 20 species are described as new: Lasioglossum (Dialictus) arenisaltans sp. nov., L. (D.) argammon sp. nov., L. (D.) austerum sp. nov., L. (D.) cactorum sp. nov., L. (D.) cembrilacus sp. nov., L. (D.) clastipedion sp. nov., L. (D.) clavicorne sp. nov., L. (D.) decorum sp. nov., L. (D.) festinum sp. nov., L. (D.) imbriumbrae sp. nov., L. (D.) julipile sp. nov., L. (D.) lilianae sp. nov., L. (D.) meteorum sp. nov., L. (D.) miltolepoides sp. nov., L. (D.) minckleyi sp. nov., L. (D.) perditum sp. nov., L. (D.) rufornatum sp. nov., L. (D. ) spivakae sp. nov., L. (D.) tessellatosum sp. nov., and L. (D.) torrens sp. nov. Previously unknown males of L. (D.) clematisellum (Cockerell, 1904), L. (D.) droegei Gibbs, 2009, L. (D.) kunzei (Cockerell, 1898), and L. (D.) pallidellum (Ellis, 1914) are described and figured for the first time. Lasioglossum (Dialictus) clarissimum (Ellis, 1914) (= Halictus clarissimus Ellis, 1914) and L. (D.) perexiguum (Sandhouse, 1924) (= Halictus (Chloralictus) perexiguus Sandhouse, 1924) are new subjective junior synonyms of L. mesillense (Cockerell, 1898) (= Halictus nymphalis var. mesillensis Cockerell, 1898). A lectotype specimen is newly designated for L. mesillense, for which the location of the type material has not previously been known. The following five new records for Mexico are reported: L. clematisellum, L. droegei, L. eophilus (Ellis, 1914), L. kunzei, and L. pallidellum.


Allred D.M. 1969. Bees of the Nevada test site. Great Basin Naturalist 29 (1): 20–24.

Ascher J.S. 2020. Digital Bee Collections Network, 2014 (and updates). Ver. 13 May 2020. National Science Foundation grant DBI 0956388; contact: Ascher J.S. (

Ascher J.S. & Pickering J. 2020. Discover Life Bee Species Guide and World Checklist (Hymenoptera: Apoidea: Anthophila). Available from [accessed 3 Apr. 2020].

Ayala R., Griswold T.L. & Bullock S.H. 1993. The Native Bees of Mexico. In: Ramamoorthy T.P., Bye R., Lot A. & Fa J. (eds) Biological Diversity of Mexico: Origins and Distribution: 179–227. Oxford University Press, New York.

Ballare K.M., Neff J.L., Ruppel R. & Jha S. 2019. Multi-scalar drivers of biodiversity: local management mediates wild bee community response to regional urbanization. Ecological Applications 29 (3): e01869.

Batáry P., Báldi A., Sárospataki M., Kohler F., Verhulst J., Knop E., Herzog F. & Kleijn D. 2010. Effect of conservation management on bees and insect-pollinated grassland plant communities in three European countries. Agriculture, Ecosystems, and Environment 136: 35–39.

Batra S.W.T. 1964. Behavior of the social bee, Lasioglossum zephyrum, within the nest. Insectes Sociaux 11 (2): 159–186.

Batra S.W.T. 1965. Organisms associated with Lasioglossum zephyrum (Hymenoptera: Halictidae). Journal of the Kansas Entomological Society 38 (4): 367–389.

Batra S.W.T. 1966. Life cycle and behavior of the primitively social bee, Lasioglossum zephyrum. University of Kansas Science Bulletin 46 (10): 359–423.

Batra S.W.T. 1987. Ethology of the vernal eusocial bee, Dialictus laevissimus (Hymenoptera: Halictidae). Journal of the Kansas Entomological Society 60 (1): 100–108.

Brown D.K. & Kaul R.B. 1981. Floral structure and mechanism in Loasaceae. American Journal of Botany 68 (3): 361–372.

Brown S.D.J., Collins R.A., Boyer S., Lefort M.C., Malumbres-Olarte J., Vink C.J. & Cruickshank R.H. 2012. SPIDER: an R package for the analysis of species identity and evolution, with particular reference to DNA barcoding. Molecular Ecology Resources 12 (3): 562–565.

Buri P., Humbert J.-Y. & Arlettaz R. 2014. Promoting pollinating insects in intensive agricultural matrices: field-scale experimental manipulation of hay-meadow mowing regimes and its effects on bees. PLoS ONE 9 (1): e85635.

Campbell J.W., Hanula J.L. & Waldrop T.A. 2007. Effects of prescribed fire and fire surrogates on floral visiting insects of the blue ridge province in North Carolina. Biological Conservation 134: 393–404.

Cockerell T.D.A. 1898a. On some small bees from Arizona. The Canadian Entomologist 30 (9): 237–239.

Cockerell T.D.A. 1898b. Tables for the determination of New Mexico bees. Bulletin of the Scientific Laboratories of Denison University 11 (3): 41–73.

Cockerell T.D.A. 1903. New bees from southern California and other records. Bulletin of the Southern California Academy of Sciences 2: 84–94.

Cockerell T.D.A. 1904. Records of American bees. The Canadian Entomologist 36 (1): 13–14.

Cockerell T.D.A. 1905. Notes on some bees in the British Museum. Transactions of the American Entomological Society 31 (4): 309–364.

Cockerell T.D.A. 1906. The bees of Florissant, Colorado. Bulletin of the American Museum of Natural History 22: 419–455.

Cockerell T.D.A. 1916. The bees of the Coronado Islands. The Canadian Entomologist 48 (2): 54–58.

Cockerell T.D.A. 1919. The bees of the Rocky Mountain National Park (Hymenop.). Entomological News, and Proceedings of the Entomological Section of the Academy of Natural Sciences of Philadelphia 30: 286–294.

Crane S. 2013. DNA Extraction from Archival Museum Insect Specimens. Available from [accessed 22 Oct. 2020].

Crawford J.C. 1902. Notes and descriptions of bees. The Canadian Entomologist 34 (9): 234–240.

Crawford J.C. 1904. Two new Halictus from New Jersey. Entomological News, and Proceedings of the Entomological Section of the Academy of Natural Sciences of Philadelphia 15 (3): 97–99.

Creedy T.J., Norman H., Tang C.Q., Qing Chin K., Andujar C., Arribas P., O’Connor R.S., Carvell C., Notton D.G. & Vogler A.P. 2020. A validated workflow for rapid taxonomic assignment and monitoring of a national fauna of bees (Apiformes) using high throughput DNA barcoding. Molecular Ecology Resources 20 (1): 40–53.

Daly H.V. 1961. Biological observations on Hemihalictus lustrans, with a description of the larva (Hymenoptera: Halictidae). Journal of the Kansas Entomological Society 34 (3): 134–141.

Danforth B.N., Conway L. & Shuqing J. 2003. Phylogeny of eusocial Lasioglossum reveals multiple losses of eusociality within a primitively eusocial clade of bees (Hymenoptera: Halictidae). Systematic Biology 52 (1): 23–36.

DeSalle R., Egan M.G. & Siddall M. 2005. The unholy trinity: taxonomy, species delimitation and DNA barcoding. Philosophical Transactions of the Royal Society of London Series B-Biological Sciences 360 (1462): 1905–1916.

Dibble A.C., Drummond F.A., Stubbs C., Veit M. & Ascher J.S. 2017. Bees of Maine, with a state species checklist. Northeastern Naturalist 24 (m15): 1–48.

Donovall L.R. & van Engelsdorp D. 2010. A checklist of the bees (Hymenoptera: Apoidea) of Pennsylvania. Journal of the Kansas Entomological Society 83 (1): 7–24.

Droege S., Tepedino V.J., LeBuhn G., Link W., Minckley R.L., Chen Q. & Conrad C. 2010. Spatial patterns of bee captures in North American bowl trapping surveys. Insect Conservation and Diversity 3: 15–23.

Ducke A. 1902. Ein neues Subgenus von Halictus Latr. Zeitschrift für Systematische Hymenopterologie und Dipterologie 2: 102–103.

Ebmer A.W. 2002. Asiatische Halictidae—10. Neue Halictidae aus China sowie diagnostische Neubeschreibungen der von Fan and Ebmer 1992 beschriebenen Lasioglossum-Arten (Insecta: Hymenoptera: Apoidea: Halictidae: Halictinae). Linzer Biologische Beiträge 34 (2): 819–934.

Eickwort G.C. 1986. First steps into eusociality: the sweat bee Dialictus lineatulus. Florida Entomologist 69 (4): 742–754.

Ellis M.D. 1914a. New American bees of the genus Halictus (Hym.). Entomological News, and Proceedings of the Entomological Section of the Academy of Natural Sciences of Philadelphia 25 (4): 151–155.

Ellis M.D. 1914b. New bees of the genus Halictus (Hym.) from United States, Guatemala and Ecuador. Journal of the New York Entomological Society 22 (3): 218–223.

Engel M.S., Hinojosa-Díaz I.A. & Yáñez-Ordóñez O. 2007. The Augochlora-like Dialictus from Guatemala and southern Mexico (Hymenoptera: Halictidae). Acta Zoológica Mexicana 23 (3): 125–134.

Faircloth B.C., McCormack J.E., Crawford N.G., Harvey M.G., Brumfield R.T. & Glenn T.C. 2012. Ultraconserved elements anchor thousands of genetic markers spanning multiple evolutionary timescales. Systematic Biology 61 (5): 717–726.

FAO/UNESCO. 2007. Digital Soil Map of the World. Ver. 3.6. FAO, Rome.

Fick S.E. & Hijmans R.J. 2017. WorldClim 2: new 1-km spatial resolution climate surfaces for global land areas. International Journal of Climatology 37 (12): 4302–4315.

Folmer O., Black M., Hoeh W., Lutz R. & Vrijenhoek R. 1994. DNA primers for amplification of mitochondrial cytochrome c oxidase subunit I from diverse metazoan invertebrates. Molecular Marine Biology and Biotechnology 3 (5): 294–299.

Françoso E. & Arias M.C. 2013. Cytochrome c oxidase I primers for corbiculate bees: DNA barcode and mini-barcode. Molecular Ecology Resources 13: 844–850.

Frankie G.W., Thorp R.W., Schindler M., Hernandez J., Ertter B. & Rizzardi M. 2005. Ecological patterns of bees and their host ornamental flowers in two northern California cities. Journal of the Kansas Entomological Society 78 (3): 227–246.

Galbraith S.M., Cane J.H., Moldenke A.R. & Rivers J.W. 2019. Wild bee diversity increases with local fire severity in a fire-prone landscape. Ecosphere 10 (4): e02668.

Geroff R.K., Gibbs J. & McCravy K.W. 2014. Assessing bee (Hymenoptera: Apoidea) diversity of an Illinois restored tallgrass prairie: methodology and conservation considerations. Journal of Insect Conservation 18: 951–964.

Gibbs J. 2009a. Integrative taxonomy identifies new (and old) species in the Lasioglossum (Dialictus) tegulare (Robertson) species group (Hymenoptera, Halictidae). Zootaxa 2032 (1): 1–38.

Gibbs J. 2009b. New species in the Lasioglossum petrellum species group identified through an integrative taxonomic approach. The Canadian Entomologist 141: 371–396.

Gibbs J. 2010. Revision of the metallic species of Lasioglossum (Dialictus) in Canada (Hymenoptera, Halictidae, Halictini). Zootaxa 2591: 1–382.

Gibbs J. 2011. Revision of the metallic Lasioglossum (Dialictus) of eastern North America (Hymenoptera: Halictidae: Halictini). Zootaxa 3073 (1): 1–216.

Gibbs J. 2018a. Bees of the genus Lasioglossum (Hymenoptera: Halictidae) from Greater Puerto Rico, West Indies. European Journal of Taxonomy 400: 1–57.

Gibbs J. 2018b. DNA barcoding a nightmare taxon: assessing barcode index numbers and barcode gaps for sweat bees. Genome 61 (1): 21–31.

Gibbs J. 2020. Hylaeus (Hylaeana) dominicalis, a new species and the first colletid bee recorded from Dominica, Lesser Antilles. Journal of Melittology 93: 1–6.

Gibbs J., Albert J. & Packer L. 2012a. Dual origins of social parasitism in North American Dialictus (Hymenoptera: Halictidae) confirmed using a phylogenetic approach. Cladistics 28: 195–207.

Gibbs J., Brady S.G., Kanda K. & Danforth B.N. 2012b. Phylogeny of halictine bees supports a shared origin of eusociality for Halictus and Lasioglossum (Apoidea: Anthophila: Halictidae). Molecular Phylogenetics and Evolution 65: 926–939.

Gibbs J., Packer L., Dumesh S. & Danforth B.N. 2013. Revision and reclassification of Lasioglossum (Evylaeus), L. (Hemihalictus), and L. (Sphecodogastra) in eastern North America (Hymenoptera: Apoidea: Halictidae). Zootaxa 3672 (1): 1–117.

Gibbs J., Ascher J.S., Rightmyer M.G. & Isaacs R. 2017. The bees of Michigan (Hymenoptera: Apoidea: Anthophila), with notes on distribution, taxonomy, pollination, and natural history. Zootaxa 4352 (1): 1–160.

Glad J.B. 1975. Taxonomy and Ecology of Mentzelia mollis Peck and Related Species. MSc thesis, Oregon State University.

Gonçalves R.B. & Oliviera P.S. 2013. Preliminary results of bowl trapping bees (Hymenoptera, Apoidea) in a southern Brazil forest fragment. Journal of Insect Biodiversity 1 (2): 1–9.

Gonzalez V.H., Osborn A.L., Brown E.R., Pavlick C.R., Enríquez E., Tscheulin T., Petanidou T., Hranitz J.M. & Barthell J.F. 2020. Effect of pan trap size on the diversity of sampled bees and abundance of bycatch. Journal of Insect Conservation 24: 1–12.

Grab H., Branstetter M.G., Amon N., Urban-Mead K.R., Park M.G., Gibbs J., Blitzer E.J., Poveda K., Loeb G. & Danforth B.N. 2019. Agriculturally dominated landscapes reduce bee phylogenetic diversity and pollination services. Science 363 (6424): 282–284.

Graenicher S. 1910. Wisconsin bees—new and little-known species. The Canadian Entomologist 42 (5): 157–160.

Griffin S.R., Brunninga-Socolar B., Kerr M.A., Gibbs J. & Winfree R. 2017. Wild bee community change over a 26-year chronosequence of restored tallgrass prairie. Restoration Ecology 25 (4): 650–660.

Harris R.A. 1979. Glossary of surface sculpturing. Occasional Papers in Entomology 28: 1–31.

Heron J. & Sheffield C.S. 2015. First record of the Lasioglossum (Dialictus) petrellum species group in Canada (Hymenoptera: Halictidae). Journal of the Entomological Society of British Columbia 112: 88–91.

Holmgren N.H. & Holmgren P.K. 2002. New mentzelias (Loasaceae) from the intermountain region of western United States. Systematic Botany 27 (4): 747–762.

Hung K.-L.J., Ascher J.S. & Holway D.A. 2017. Urbanization-induced habitat fragmentation erodes multiple components of temporal diversity in a Southern California native bee assemblage. PLoS ONE 12 (8): e0184136.

Hurd P.D. 1970. A new, narrowly polylectic, autumnal species of Dialictus from the flowers of Jepsonia heterandra, an endemic California saxifrage (Hymenoptera: Apoidea). The Pan-Pacific Entomologist 46: 209–212.

Hurd P.D. 1979. Superfamily Apoidea. In: Krombein K.V., Hurd P.D., Smith D.R. & Burks B.D. (eds) Catalog of Hymenoptera in America North of Mexico: 1741–2209. Smithsonian Institution Press, Washington, D.C.

International Commission of Zoological Nomenclature. 1997. Opinion 1882: Dialictus Robertson, 1902 and Chloralictus Robertson, 1902 (Insecta, Hymenoptera): given precedence over Paralictus Robertson, 1901. Bulletin of Zoological Nomenclature 54 (3): 201–202.

International Commission of Zoological Nomenclature. 1999. International Code of Zoological Nomenclature. The International Trust for Zoological Nomenclature, London.

Joshi N.K., Leslie T., Rajotte E.G., Kammerer M.A., Otieno M. & Biddinger D.J. 2015. Comparative trapping efficiency to characterize bee abundance, diversity, and community composition in apple orchards. Annals of the Entomological Society of America 108 (5): 785–799.

Kalyaanamoorthy S., Minh B.Q., Wong T.K.F., von Haeseler A. & Jermiin L.S. 2017. ModelFinder: Fast model selection for accurate phylogenetic estimates. Nature Methods 14: 587–589.

Kearse M., Moir R., Wilson A., Stones-Havas S., Cheung M., Sturrock S., Buxton S., Cooper A., Markowitz S., Duran C., Thierer T., Ashton B., Meintjes P. & Drummond A. 2012. Geneious Basic: An integrated and extendable desktop software platform for the organization and analysis of sequence data. Bioinformatics 28 (12): 1647–1649.

Keeler K.H. 1981. Function of Mentzelia nuda (Loasaceae) postfloral nectaries in seed defense. American Journal of Botany 68 (2): 295–299.

Klein A.-M., Vaissière B.E., Cane J.H., Steffan-Dewenter I., Cunningham S.A., Kremen C. & Tscharntke T. 2007. Importance of pollinators in changing landscapes for world crops. Proceedings of the Royal Society B-Biological Sciences 274: 303–313.

Knerer G. 1969. Synergistic evolution of halictine nest architecture and social behavior. Canadian Journal of Zoology 47: 925–930.

Knerer G. & Atwood C.E. 1962. An annotated check list of the non-parasitic Halictidae (Hymenoptera) of Ontario. Proceedings of the Entomological Society of Ontario 92: 160–176.

Krijthe J.H. 2015. Rtsne: T-distributed Stochastic Neighbor Embedding using a Barnes-Hut Implementation. Available from [accessed 16 Oct. 2020].

Krombein K.V. 1967. Superfamily Apoidea. In: Krombein K.V. & Burks B.D. (eds) Hymenoptera of America North of Mexico–Synoptic Catalog, Second Supplement. United States Department of Agriculture, Washington, D. C.

Kuhlman M. & Burrows S. 2017. Checklist of bees (Apoidea) from a private conservation property in west-central Montana. Biodiversity Data Journal 5: e11506.

Landaverde-González P., Moo-Valle H., Murray T.E., Paxton R.J., Quezada-Euán J.J.G. & Husemann M. 2017. Sympatric lineage divergence in cryptic Neotropical sweat bees (Hymenoptera: Halictidae: Lasioglossum). Organisms Diversity and Evolution 17 (1): 251–265.

Lettow M.C., Brudvig L.A., Bahlai C.A., Gibbs J., Jean R.P. & Landis D.A. 2018. Bee community responses to a gradient of oak savanna restoration practices. Restoration Ecology 26 (5): 882–890.

Maddison W.P. & Maddison D.R. 2019. Mesquite: a Modular System for Evolutionary Analysis. Ver. 3.61.

Maechler M., Rousseeuw P., Struyf A., Hubert M. & Hornik K. 2019. cluster: Cluster Analysis Basics and Extensions. Ver. R package ver. 2.1.0.

McGinley R.J. 2003. Studies of Halictinae (Apoidea: Halictidae), II: Revision of Sphecodogastra Ashmead, floral specialists of Onagraceae. Smithsonian Contributions to Zoology 610: 1–55.

Messinger-Carril O., Griswold T.L., Haefner J. & Wilson J.S. 2018. Wild bees of Grand Staircase-Escalante National Monument: richness, abundance, and spatio-temporal beta-diversity. PeerJ 6: e5867.

Michener C.D. 1944. Comparative external morphology, phylogeny, and a classification of the bees (Hymenoptera). Bulletin of the American Museum of Natural History 82 (6): 151–326.

Michener C.D. 1951. Superfamily Apoidea. In: Muesebeck C.F.W., Krombein K.V. & Townes H.K. (eds) Hymenoptera of America North of Mexico Synoptic Catalog: 1043–1255. United States Government Printing Office, Washington, D.C.

Michener C. D. 1960. Notes on the biology and supposed parthenogenesis of halictine bees from the Australian region. Journal of the Kansas Entomological Society 33 (2): 85–96.

Michener C.D. 1965. A classification of the bees of the Australian and South Pacific regions. Bulletin of the American Museum of Natural History 130: 1–362.

Michener C.D. 1966. The bionomics of a primitively social bee, Lasioglossum versatum (Hymenoptera: Halictidae). Journal of the Kansas Entomological Society 39 (2): 193–217.

Michener C.D. 1974. The Social Behavior of the Bees. The Belknap Press of Harvard University Press, Cambridge, MA.

Michener C.D. 1979. Biogeography of the bees. Annals of the Missouri Botanical Garden 66 (3): 277–347.

Michener C.D. 1990. Reproduction and castes in social halictine bees. In: Engels W. (ed.) Social Insects: An Evolutionary Approach to Castes and Reproduction: 77–121. Springer-Verlag, Berlin.

Michener C.D. 2007. The Bees of the World. The Johns Hopkins University Press, Baltimore, MD.

Michener C.D. & Lange R.B. 1958. Observations on the behavior of Brasilian halictid bees. V. Chlora-lictus. Insectes Sociaux 5 (4): 379–407.

Michener C.D. & Wille A. 1961. The bionomics of a primitively social bee, Lasioglossum inconspicuum. University of Kansas Science Bulletin 42 (11): 1123–1202.

Michener C.D., Brothers D.J. & Kamm D.R. 1971a. Interactions in colonies of primitively social bees: II, some queen-worker relations in Lasioglossum zephyrum. Journal of the Kansas Entomological Society 44 (2): 276–279.

Michener C.D., Brothers D.J. & Kamm D.R. 1971b. Interactions in colonies of primitively social bees: Artificial colonies of Lasioglossum zephyrum. Proceedings of the National Academy of Sciences 68 (6): 1241–1245.

Minckley R.L. 2008. Faunal composition and species richness differences of bees (Hymenoptera: Apiformes) from two north American regions. Apidologie 39 (1): 176–188.

Mitchell T.B. 1960. Bees of the eastern United States, Volume I. North Carolina Agricultural Experiment Station Technical Bulletin 141: 1–538.

Mitchell T.B. 1962. Bees of the eastern United States, Volume II. North Carolina Agricultural Experiment Station Technical Bulletin 152: 1–557.

Morse R.A. 1960. The abundance of wild bees (Apoidea) in the northeastern United States. Journal of Economic Entomology 53 (4): 679–680.

Moure J.S. 1947. Novos agrupamentos genéricos e algumas espécies novas de abelhas sulamericanas. Museu Paranaense Publicações Avulsas 3: 1–37.

Moure J.S. 2001. Uma pequena abelha com cabeça e mandíbulas excepcionais (Hymenoptera, Halictidae). Revista Brasileira de Zoologia 18: 493–497.

Moure J.S. & Hurd P.D. 1987. An Annotated Catalog of the Halictid Bees of the Western Hemisphere (Hymenoptera: Halictidae). Smithsonian Institution Press, Washington, D.C.

Murao R. & Tadauchi O. 2011. Notes on colour variation of Lasioglossum (Evylaeus) politum pekingense (Hymenoptera, Halictidae). Japanese Journal of Systematic Entomology 17 (1): 55–58.

Oksanen J., Blanchet F.G., Friendly M., Kindt R., Legendre P., McGlinn D., Minchin P.R., O’Hara R.B., Simpson G.L., Solymos P., Stevens M.H.H., Szoecs E. & Wagner H. 2018. Vegan: Community Ecology Package. Ver. 2.5.2.

Ollerton J., Winfree R. & Tarrant S. 2011. How many flowering plants are pollinated by animals? Oikos 120: 321–326.

Onuferko T.M., Skandilis D.A., León Cordero R. & Richards M.H. 2017. Rapid initial recovery and long-term persistence of a bee community in a former landfill. Insect Conservation and Diversity 11 (1): 88–99.

Pabalan N., Davey K.G. & Packer L. 2000. Escalation of aggressive interactions during staged encounters in Halictus ligatus Say (Hymenoptera: Halictidae), with a comparison of circle tube behaviors with other halictine species. Journal of Insect Behavior 13 (5): 627–650.

Packer L. 1992. The social organisation of Lasioglossum (Dialictus) laevissimum (Smith) in southern Alberta. Canadian Journal of Zoology 70: 1767–1774.

Packer L. 1993. Multiple-foundress associations in sweat bees. In: Keller L. (ed.) Queen Number and Sociality in Insects: 214–233. Oxford University Press, New York.

Packer L. 1994. Lasioglossum (Dialictus) tenax (Sandhouse) (Hymenoptera: Halictidae) as a solitary sweat bee. Insectes Sociaux 41: 309–313.

Patenaude A. 2007. Diversity, Composition, and Seasonality of Wild Bees (Hymenoptera: Apoidea) in a Northern Mixed-grass Prairie Preserve. MSc thesis, University of Manitoba, Winnipeg, MB.

Pauly A. 1984. Classification des Halictidae de Madagascar et des îles voisines. I. Halictinae (Hymenoptera Apoidea). Verhandlungen der Naturforschenden Gesellschaft in Basel 94: 121–156.

Pauly A., Gibbs J. & Kuhlmann M. 2012. Capalictus, a new subgenus of Lasioglossum Curtis, 1833 from South Africa, with description of three new species (Hymenoptera, Apoidea, Halictidae). European Journal of Taxonomy 28: 1–28.

Pesenko Y.A. 2007. Subgeneric classification of the Palaearctic bees of the genus Evylaeus Robertson (Hymenoptera: Halictidae). Zootaxa 1500: 1–54.

Pesenko Y.A., Banaszak J., Radchenko V.G. & Cierzniak T. 2000. Bees of the Family Halictidae (excluding Sphecodes) of Poland: Taxonomy, Ecology, Bionomics. Wydawnictwo Uczelniane Wyzszej Szkofy Pedagogicznej w Bydgoszczy, Bydgoszcz.

Phillips S.J., Dudík M. & Schapire R.E. s.d. Maxent Software for Modeling Species Niches and Distributions. Ver. 3.4.1 [accessed 9 May 2020].

Phillips S.J., Anderson R.P. & Schapire R.E. 2006. Maximum entropy modeling of species geographic distributions. Ecological Modelling 190: 231–259.

Phillips S.J., Anderson R.P., Dudík M., Schapire R.E. & Blair M.E. 2017. Opening the black box: an open-source release of Maxent. Ecography 40: 887–893.

Pierce M.P., Branstetter M.G. & Longino J.T. 2017. Integrative taxonomy reveals multiple cryptic species within Central American Hylomyrma Forel, 1912 (Hymenoptera: Formicidae). Myrmecological News 25: 131–143.

Plateaux-Quénu C. 1959. Un nouveau type de société d’insectes: Halictus marginatus Brullé (Hym., Apoidea). Année biologique 35: 325–444.

Portman Z.M., Brunninga-Socolar B. & Cariveau D.P. 2020. The state of bee monitoring in the United States: a call to refocus away from bowl traps and towards more effective methods. Annals of the Entomological Society of America 113 (5): 1–6. 2020. QGIS Geographic Information System. Ver. 3.12. Open Source Geospatial Foundation Project, Beaverton, OR.

R Core Team. 2020. R: A Language and Environment for Statistical Computing. Ver. 4.0.0. R Foundation for Statistical Computing, Vienna, Austria.

Ratnasingham S. & Hebert P.D.N. 2007. BOLD: the Barcode of Life Data System ( Molecular Ecology Notes 7 (3): 355–364.

Ratnasingham S. & Hebert P.D.N. 2013. A DNA-based registry for all animal species: the barcode index number (BIN) system. PLoS ONE 8 (7): e66213.

Reilly J.R., Artz D.R., Biddinger D.J., Bobiwash K., Boyle N.K., Brittain C., Brokaw J., Campbell J.W., Daniels J., Elle E., Ellis J.D., Fleischer S.J., Gibbs J., Gillespie R.L., Gundersen K.B., Gut L., Hoffman G., Joshi N.K., Lundin O., Mason K., McGrady C.M., Peterson S.S., Pitts-Singer T.L., Rao S., Rothwell N., Rowe L., Ward K.L., Williams N.M., Wilson J.K., Isaacs R. & Winfree R. 2020. Crop production in the USA is frequently limited by a lack of pollinators. Proceedings of the Royal Society B-Biological Sciences 287 (1931): e20200922.

Rhoades P., Griswold T.L., Ikerd H., Waits L., Bosque-Pérez N.A. & Eigenbrode S.D. 2017a. The native bee fauna of the Palouse Prairie (Hymenoptera: Apoidea). Journal of Melittology 66: 1–20.

Rhoades P., Griswold T.L., Waits L., Bosque-Pérez N.A., Kennedy C.M. & Eigenbrode S.D. 2017b. Sampling technique affects detection of habitat factors influencing wild bee communities. Journal of Insect Conservation 21: 703–714.

Richards M.H. 2000. Evidence for geographic variation in colony social organization in an obligately social sweat bee, Lasioglossum malachurum (Kirby) (Hymenoptera; Halictidae). Canadian Journal of Zoology 78: 1259–1266.

Robertson C. 1895. Notes on bees, with descriptions of new species. Transactions of the American Entomological Society 22 (2): 115–128.

Robertson C. 1897. North American bees—descriptions and synonyms. Transactions of the Academy of Science of St. Louis 7 (14): 315–356.

Robertson C. 1901. Some new or little-known bees. The Canadian Entomologist 33 (8): 229–231.

Robertson C. 1902. Synopsis of Halictinae. The Canadian Entomologist 34 (9): 243–250.

Ronquist F., Teslenko M., Van Der Mark P., Ayres D.L., Darling A., Höhna S., Larget B., Liu L., Suchard M.A. & Huelsenbeck J.P. 2012. MrBayes 3.2: efficient Bayesian phylogenetic inference and model choice across a large model space. Systematic Biology 61 (3): 539–542.

Sakagami S.F. & Munakata M. 1972. Distribution and bionomics of a transpalaearctic eusocial halictine bee, Lasioglossum (Evylaeus) calceatum, in northern Japan, with reference to its solitary life cycle at high altitude. Journal of the Faculty of Science, Hokkaido University, Series 6, Zoology 18 (3): 411–439.

Sakagami S.F., Laroca S. & Moure J.S. 1967. Wild bee biocoenotics in São Jose dos Pinhais (PR), south Brazil. Preliminary report. Journal of the Faculty of Science, Hokkaido University, Series 6, Zoology 16: 253–291.

Sandhouse G.A. 1923. The bee-genus Dialictus. The Canadian Entomologist 55 (8): 193–195.

Sandhouse G.A. 1924. New North American species of bees belonging to the genus Halictus (Chloralictus). Proceedings of the United States National Museum 65 (19): 1–43.

Schrottky C. 1911. Descripção de abelhas novas do Brazil e de regiões visinhas. Revista do Museu Paulista 8: 71–88.

Schwarz M.P., Richards M.H. & Danforth B.N. 2007. Changing paradigms in insect social evolution: insights from halictine and allodapine bees. Annual Review of Entomology 52: 127–150.

Scott V.L., Ascher J.S., Griswold T.L. & Nufio C.R. 2011. The bees of Colorado. Natural History Inventory of Colorado 23: 1–100.

Smith B.A., Brown R.L., LaBerge W.E. & Griswold T.L. 2012. A faunistic survey of bees (Hymenoptera: Apoidea) in the Black Belt Prairie of Mississippi. Journal of the Kansas Entomological Society 85 (1): 32–47.

Smith F. 1853. Catalogue of Hymenopterous Insects in the Collection of the British Museum. Part I. Andrenidae and Apidae. Taylor and Francis, London.

Smyth B.B. 1897. Floral horologe for Kansas. In: Smyth B.B. (ed.) Transactions of the Annual Meetings of the Kansas Academy of Science: 106–108. JSTOR, Topeka, KS.

Stockhammer K.A. 1967. Some notes on the biology of the blue sweat bee, Lasioglossum coeruleum (Apoidea: Halictidae). Journal of the Kansas Entomological Society 40: 177–189.

Tepedino V.J., Bradley B.A. & Griswold T.L. 2008. Might flowers of invasive plants increase native bee carrying capacity? Intimations from Capitol Reef National Park, Utah. Natural Areas Journal 28 (1): 44–50.;2

Toler T.R., Evans E.W. & Tepedino V.J. 2005. Pan-trapping for bees (Hymenoptera: Apiformes) in Utah’s West Desert: the importance of colour diversity. The Pan-Pacific Entomologist 81 (3/4): 103–113.

Tommasi D., Miro A., Higo H.A. & Winston M.L. 2004. Bee diversity and abundance in an urban setting. The Canadian Entomologist 136 (6): 851–869.

van der Maaten L.J.P. 2014. Accelerating t-SNE using tree-based algorithms. Journal of Machine Learning Research 15: 3221–3245.

van der Maaten L.J.P. & Hinton G.E. 2008. Visualizing high-dDimensional data using t-SNE. Journal of Machine Learning Research 9: 2579–2605.

Venables W.N. & Ripley B.D. 2002. Modern Applied Statistics with S. Springer, New York.

Viereck H.L., MacGillivray A.D., Brues C.T., Wheeler W.M. & Rohwer S.A. 1916. The Hymenoptera, or wasp-like insects, of Connecticut. In: Britton W.E. (ed.) Guide to the Insects of Connecticut: 824. Connecticut Geological and Natural History Survey, Hartford, CT.

Walker K. 1995. Revision of the Australian native bee subgenus Lasioglossum (Chilalictus) (Hymenoptera: Halictidae). Memoirs of the Museum of Victoria 55 (1–2): 1–423.

Warncke K. 1975. Beiträge zur Systematik und Verbreitung der Furchenbienen in der Türkei (Hymenoptera, Apoidea, Halictus). Polskie Pismo Entomologiczne 45: 81–123.

Wcislo W.T. 1997. Invasion of nests of Lasioglossum imitatum by a social parasite, Paralictus asteris (Hymenoptera: Halictidae). Ethology 103: 1–11.

Webb D.W. 1980. Primary insect types in the Illinois Natural History Survey Collection, exclusive of the Collembola and Thysanoptera. Illinois Natural History Survey Bulletin 32 (2): 51–191.

WFO. 2020. World Flora Online. Available from [accessed 9 May 2020].

Wiley E.O. & Mayden R.L. 2000. The evolutionary species concept. In: Wheeler Q.D. & Meier R. (eds) Species Concepts and Phylogenetic Theory: A Debate: 70–89. Columbia University Press, New York.

Wille A. & Orozco E. 1970. The life cycle and behavior of the social bee Lasioglossum (Dialictus) umbripenne (Hymenoptera: Halictidae). Revista de Biologia Tropical 17 (2): 199–245.

Williams P. H., Brown M.J.F., Carolan J.C., An J., Goulson D., Aytekin A.M., Best L.R., Byvaltsev A.M., Cederberg B., Dawson R., Huang J., Ito M., Monfared A., Raina R.H., Schmid-Hempel P., Sheffield C.S., Šima P. & Xie Z. 2012. Unveiling cryptic species of the bumblebee subgenus Bombus s. str. worldwide with COI barcodes (Hymenoptera: Apidae). Systematics and Biodiversity 10 (1): 21–56.

Wilson J.S., Kelly M. & Messinger-Carril O. 2018. Reducing protected lands in a hotspot of bee biodiversity: bees of Grand

Staircase-Escalante National Monument. PeerJ 6: e6057.

Wolf A.T. & Ascher J.S. 2009. Bees of Wisconsin (Hymenoptera: Apoidea: Anthophila). Great Lakes Entomologist 41: 129–168.

How to Cite
Gardner, J., & Gibbs, J. (2020). The ‘red-tailed’ Lasioglossum (Dialictus) (Hymenoptera: Halictidae) of the western Nearctic. European Journal of Taxonomy, 725(1), 1-242.