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Genus Osmia - Mason Bees

Bee - Osmia integra Osmia? - Osmia montana Osmiini 01b - Osmia coloradensis - female bee - Osmia distincta - female Bee house, the next generation - Osmia cornifrons - male Bee - Osmia lignaria - female Metallic green bee - Osmia ribifloris - male Mason Bee - Osmia taurus - 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 Megachilidae (Leaf-cutter Bees, Mason Bees, and allies)
Subfamily Megachilinae
Tribe Osmiini
Genus Osmia (Mason Bees)
Explanation of Names
Author: Panzer, 1806
Numbers
~150 spp. in 9 subgenera our area, >350 spp. in 23 subgenera worldwide(1)
Identification
Metallic green, blue or blue-green, with short, robust body.
Key to genera of te Western Hemisphere on pg. 478 of Michener(2)(2007).
Range
Holarctic, with 1 sp. ranging into the Neotropics [map](1)
Season
Most species early-late spring, a few active in summer.
(starts flying in Jan. in sw US, and in Mar. elsewhere)
Food
Many species visit Vaccinium, including blueberries, and other Ericaceae.
Remarks
Variety of nesting; some excavate in the soil, others use hollow stems. They partition the cells with walls made of clay or other materials.
Print References
Michener, Charles D. (1949) A Revision of the American Species of Diceratosmia (Hymenoptera, Megachilidae). Annals Ent. Soc. Amer., 42(3): 258-264 (Full Text)
Rust, Richard W. (1974). The systematics and biology of the genus Osmia, subgenera Osmia, Chalcosmia and Cephalosmia (Hymenoptera: Megachilidae). Wasmann Jour. Biol. 32: 1-93 (Full Text)
Sandhouse, Grace A. (1924). Bees of the genus Osmia in the collection of the California Academy of Sciences. Proc. Calif. Acad. Sci. (4) 13: 341-372 (Full Text...early key to western species on pg. 357)
Sandhouse, Grace A. (1939). The North American bees of the genus Osmia. Memoirs of the Entomol. Soc. Wash. 1: 1-167.
Sinha, Ranendra N. (1958). A subgeneric revision of the genus Osmia in the Western Hemisphere (Hymenoptera: Megachilidae). Kans. Univ. Sci. Bul. 39 (5): 211-261 (Full Text)
Sinha, R. N. & C. D. Michener (1958). A revision of the genus Osmia, subgenus Cetrosmia (Hymenoptera: Megachilidae). Kans. Univ. Sci. Bul. 39 (7): 275-303 (Full Text)
Snelling, Roy R. (1967). Description of a new subgenus of Osmia (Hymenoptera: Megachilidae). Bull. of the Southern Calif. Acad. of Sci. 66: 103-108 (Full Text)
White, Jimmy R. (1952). A revision of the genus Osmia, subgenus Acanthosmioides (Hymenoptera: Megachilidae). Kans. Univ. Sci. Bul. 35: 219-307 (Full Text)