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For Insects, Spiders & Their Kin
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Subgenus Chelostomoides

Small bee 2 - Megachile campanulae Megachile rotundata ? - Megachile angelarum - male Bee - Megachile megachile? - Megachile Very small Megachilidae - Megachile - female leafcutter bees fighting - Megachile Tiny Megachile with coppery accents on abdomen - Megachile Megachile or Hoplitis, maybe? - Megachile
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 (Apoidea (clade Anthophila) - Bees)
Family Megachilidae (Leafcutter, Mason, and Resin Bees, and allies)
Subfamily Megachilinae (Leafcutter, Resin, Mortar, Sharptail, Mason, and Woolcarder bees and relatives)
Tribe Megachilini (Leafcutter, Resin, Mortar, and Sharptail bees)
Genus Megachile (Leafcutter and Resin Bees)
No Taxon Subgenus Chelostomoides
Numbers
17 spp. in our area, 35 spp. total(1)
Range
Canada to Peru(1)
Remarks
Apparently most or all use plant resins to build nest cell walls.
Internet References
J. Kansas Entomoll. Soc. Armbrust, E. Resource Use and Nesting Behavior of Megachile prosopidis and M. chilopsidis with Notes on M. discorhina (Hymenoptera: Megachilidae)