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Tribe Osmiini

Another megachil? - Heriades - female Osmiini? - Protosmia rubifloris - male Blue Bee ID Request - Osmia - female Osmiini 01b - Osmia coloradensis Early spring bee - Osmia - male Bee with Red & Black Abdomen (either Ashmeadiella or Hoplitis) in California Osmia (Melanosmia?) - Osmia - female Bee emerging from turret - female
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Class Insecta (Insects)
Order Hymenoptera (Ants, Bees, Wasps and Sawflies)
No Taxon (Aculeata - Bees, Ants, and other Stinging Wasps)
No Taxon (Anthophila (Apoidea) - Bees)
Family Megachilidae (Leaf-cutter bees, Mason Bees, and allies)
Subfamily Megachilinae
Tribe Osmiini
Identification
have conspicuous arolia (unlike Megachile, except some rare Asian species)