Reprinted from: Cockerell,T.A. 1903. New American hymenoptera, mostly of the genus Nomada. Ann. Mag. Nat. Hist. 64(3):203-204
? .—Length about 9| millim.
Form ordinary, with oval abdomen, which is extremely finely punctured ; rather dark ferruginous, with a curved
stripe beneath each antenna, a large patch above antenna1
joining a patch enclosing ocelli, cheeks behind, sides of prothorax,
space behind tubercles, area between wings and the
four hind coxse, coxae behind except at apex, extreme base of
first four femora and underside of hind femora, stripe on
mesothorax, broad in front, area on each side of scutellum
and sutures between scutellum and mesothorax and postscutellum,
median stripe on metathorax, base of first abdominal
segment, suffused spots at sides of first three segments near
hind margin, and three bands on ventral surface of abdomen,
not reaching sides, all black. There is no yellow about the
insect. Antennas wholly ferruginous. Mandibles simple.
Tegulaa reddish amber. Wings moderately dark, stigma dark
ferruginous, nervures piceous, second submarginal cell very
broad above. First joint of anterior tarsi with a rounded
excavation on the underside near the base, its proximal side
produced into a sort of tooth, which is larger than in some
allied species.
Hab. Corvallis, Oregon, April 6.
Received from Mr. H. L. Viereck. Named after William
Clark, the explorer.
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