Reprinted from:
Viereck, H.L. 1904. Synopsis of bees of Oregon, Washington, British Columbia and Vancouver. — III. Canadian Entomologist 36: 189-196, 221-232.
The copyright on this work has expired.
The information below was extracted from the key to males on pp. 193-194.
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MALE. — Cheeks regularly rounded, not angulate. Joint 3 about equal to 4. First recurrent nervure received by the second submarginal cell before the middle. Dorsulum impunctate.
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