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Subgenus Chelostomoides

Cavity nesting native bee - Megachile Bees feeding another in Palo Verde tree - Megachile Megachile - nest site competition? - Megachile angelarum - female unknown bee 2 - Megachile Unknown Bee - Megachile megachilid of Agastache - Megachile Native bee, maybe Megachile? - Megachile Male resin bee - Megachile exilis? - Megachile - male
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 Megachilidae (Leafcutter, Mason, and Resin Bees, and allies)
Subfamily Megachilinae
Tribe Megachilini
Genus Megachile (Leafcutter, Resin, and Mortar Bees)
No Taxon Subgenus Chelostomoides
17 spp. in our area, 35 spp. total(1)
Canada to Peru(1)
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)