204 Mr. T. D. A. Cockerell on 
finely punctured; rather dark ferruginous, with a curved 
stripe beneath each antenna, a large patch above antenna, 
joiming a patch enclosing ocelli, cheeks behind, sides of pro- 
thorax, space behind tubercles, area between wings and the 
four hind cox, coxee 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 _post- 
scutellum, 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. Antenne wholly terruginous. Mandibles simple. 
Tegule 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. 
Nomada Howleri, sp. n. 
9 —Length about 83 millim. 
Form ordinary, abdomen long-oval; head and thorax 
black, quite densely clothed with pale brownish-grey or dirty 
white hair; facial quadrangle broader than long; narrow 
anterior margin of clypeus and mandibles dull ferruginous ; 
mandibles simple, rather strongly curved; the only yellow 
about the insect is a small patch at the extreme lower corners 
of face, next to the eyes; scape black; flagellum black above, 
bright ferruginous beneath ; third antennal joint long, almost 
er quite as long as fourth; scutellum neither prominent nor 
bilobed ; tegulz shining ferruginous, not punctured. Wings 
dusky, especially on apical margin, the light spot neither 
conspicuous nor well defined; nervures and stigma piccous ; 
second submarginal cell very broad above, third narrowed 
almost toa point. Legs ferruginous, the cox and trochanters, 
the anterior femora mcre or less behind, the middle and hind 
femora at base in front, and behind except at apex, anda 
stripe on the outside of the anterior and middle tibize black ; 
middle and hind tarsi blackish, the tips of the joints red; 
hair on inner side of basal joint of hind tarsi very pale golden ; 
abdomen dark chestnut-red above and below, basal half of 
