1910] Cockerell — Bees of the Genus Nomada 91 
SOME BEES OF THE GENUS NOMADA FROM 
WASHINGTON STATE. 
By T. D. A. CocKERELL. 
The University of Colorado. 
Nomada mutans Sp. nov. 
@. Length about 7 mm.; black with creamy-white markings, and hardly 
any hair; anterior coxe without spines; head and thorax strongly 
punctured; head broad, with the following light markings: lateral 
marks, broad below, with a little notch on each side near to black 
part of clypeus, extending upward above level of antenne, ending in 
a rather obtuse point, a little away from orbital margin; lower two 
thirds of clypeus, the margin of the light area broadly angled in 
the middle above; labrum, but the lower half suffused with reddish; 
basal half of mandibles (apical half reddish); and narrow posterior 
orbits; mandibles simple; second joint of labial palpi much less than 
half length of first; scape blackish behind, reddish in front, with an 
obscure yellowish mark; flagellum thick, dark reddish above, light 
ferruginous below, first joint paler; third antennal joint conspicuously 
longer than fourth; mesothorax shining between the strong punctures; 
light markings of thorax as follows: upper margin of prothorax, 
tubercles, tegulz, scutellum, postscutellum, and a triangular spot on 
anterior part of pleura; scutellum little elevated; wings dusky, stigma 
ferruginous, nervures fuscous; t. m. a short distance basad of b. n.; 
first r. n. reaching second s. m. well beyond middle; legs black, with 
creamy-white spots on hind coxe, apices of femora and apices and 
bases of tibiz; anterior legs light ferruginous in front; middle legs 
nearly the same; hind femora with a reddish stripe; anterior tarsi 
entirely pale reddish; spurs white; abdomen very minutely punctured, 
with five entire broad creamy-white bands, the first with a pair of 
spots; band of silver-white hair on fifth segment rather narrow; 
venter with light bands. 
Var. a. Postscutellum all black; band on first abdominal segment with- 
out enclosed spots, but with a ferruginous notch on each side behind. 
Var. b. Smaller, length about 5%4 mm.; lateral marks not extending above 
antenne; scutellum with two large light spots; postscutellum black; 
fourth and fifth abdominal bands broadly excavated in front on each 
side. 
Hab.— Pullman, Washington State, 1908 (W. M. Mann). Two 
typical, Aug. 9; one var. a., Aug. 9; two var. b., Aug. 9 and 30. A 
