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Subgenus Dialictus, Metallic-Sweat Bees

Which bee is this, please? - Lasioglossum Bee - Agapostemon - Lasioglossum semicaeruleum - female Bump Headed Bee - Lasioglossum Bees near asters in November - Lasioglossum - female bee - Lasioglossum subviridatum Lasioglossum - female Golden - Lasioglossum Anthophila (Apoidea) - Bees - Lasioglossum - male
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Hymenoptera (Ants, Bees, Wasps and Sawflies)
No Taxon (Aculeata - Ants, Bees and Stinging Wasps)
No Taxon (Anthophila (Apoidea) - Bees)
Family Halictidae (Sweat Bees)
Subfamily Halictinae
Tribe Halictini
Genus Lasioglossum
No Taxon Subgenus Dialictus, Metallic-Sweat Bees
Numbers
~200 spp. in our area, ~600 spp. worldwide(1)
Range
mostly holarctic and neotropical (a few spp. in SE Asia); in our area, all but 4 spp. in the US, 91 spp. in Canada(1)
Remarks
Extremely difficult to ID to species, even under the microscope. They are so morphologically monotonous that breaking them into species groups is only an option for some. Many species can only be IDed by the relative density of punctures on the surface of the bee.
However: "The limiting factor is resolution of the images. If we could clearly see antennal proportions and scutal sculpturing many species identifications would become possible." (Comment by John Ascher).
Male and female