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Tribe Osmiini - Mason bees and relatives

 
 
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On the classification of North American Chelostoma (Hymenoptera: Megachilidae)
By Engel G.S., Griswold T.
J. Melittol. 90: 1‒6, 2019

American bees of the genus Chelostoma
By Michener C.D.
Pan-Pac. Entomol. 14: 36‒45, 1938

A subgeneric revision of the genus Osmia in the Western Hemisphere (Hymenoptera: Megachilidae)
By R. N. Sinha
Kans. Univ. Sci. Bul. Vol. 39, No. 5, pp. 211-261, 1958

The systematics and biology of the genus Osmia, subgenera Osmia, Chalcosmia and Cephalosmia
By R. W. Rust
Wasmann Journal of Biology 32(1):1-93, 1974

The North American bees of the genus Osmia
By G.A. Sandhouse
Mem. Ent. Soc. Wash. 1: 1-167, 1939
Full text viewable online and downloadable as pdf, but only one page at a time.

A Revision of the Genus Ashmeadiella (Hymen., Megachilidae)
By Michener, Charles D.
The American Midland Naturalist. 22(1): 1-84, 1939
Available online at JStor

The Megachiline Bees of California (Hymenoptera: Megachilidae)
By Paul D. Hurd, Jr., and Charles D. Michener
University of California Press, 1955
Bulletin of the California Insect Survey Vol. 3 FULL TEXT

Phylogeny of the bee family Megachilidae (Hymenoptera: Apoidea) based on adult morphology
By Gonzalez V.H., Griswold T.L., Praz C.J., Danforth B.N.
Syst. Entomol. 37: 261-286, 2012

 
 
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