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Osmia coloradensis Cresson, 1878


Scientific Name: Osmia coloradensis Cresson, 1878

Common Name: Colorado Mason Bee


Osmia coloradensis Cresson, 1878: 105 [♀].

     Lectotype ♀, desginated by Cresson (1916: 115). USA, Colorado, by Ridings and Morrison [ANSP no 2513].

Osmia hypochrysea Cockerell, 1906: 449 [♀]. Synonymy by Cockerell (1928: 120), as a subspecies of Osmia coloradensis Cresson, 1878; synonymy by Sandhouse (1939: 18).

     Holotype ♀. USA, Colorado, Florissant, 12 July 1906, by S.A. Rohwer [CAS no. 15671].

Osmia hypochrysea Rohweri Cockerell, 1907: 366 [♀]. Synonymy by Sandhouse (1939: 18).

     Holotype ♀. USA, Colorado, Boulder, May 1906, by S.A. Rohwer [CAS no. 15672].

Osmia pasadenae Cockerell, 1910: 122 [♂]. Synonymy by Sandhouse (1939: 18).

     Holotype ♂. USA, California, Pasadena, 2 April 1909, by F. Grinnell, Jr. [USNM no. 27844].


Taxonomic Notes: Though Michener (1936: 26) reportedly recognized and described the male, Sandhouse (1939: 19) indicated that his treatment was not detailed enough to associate it with certainty.

DNA Barcode Index Number (BIN): BOLD:AAB2770

Biology: Cripps and Rust (1989) indiacted that this species was a Asteraceae specialist. Tepidino et al. (2022) indicated that this species is parsivoltine, with populations containing individuals that will winter for one or two years. It nests in pre-existing cavities, and will accept trapnests (Tepidino et al. 2022).

Distribution in Canada: Gibson 1912 [BC], 1916 [BC]; Buckell 1950 [BC]; Sheffield and Heron 2019 [BC]. AB ,SK


Cripps C, Rust RW (1989) Pollen preferences of seven Osmia species (Hymenoptera: Megachilidae). Environmental Entomology 18(1): 133-138.

Wong LH, Forrest JRK (2021) The earlier the better? Nesting timing and reproductive success in subalpine cavity-nesting bees. Journal of Animal Ecology 90(5): 1353-1366.

Sociality: Solitary
Nesting: Cavity Renter
Pollen Specialization: Broad Oligolecty
Wintering Stage: Adult, Mature Larva

Crop Preference: Not Available
Non Crop Preference: Not Available

Distribution: Alberta, British Columbia, Saskatchewan
Ecozone: Montane Cordillera, Prairie, Western Interior Basin