Studies of North American Bees 87 



1905. Nomada aquUanim Cockerell, Bull. 94, Colorado Exp. Sta., p. 

 74, c?. 



This species has for several years been known only from the 

 unique male type collected at 8,000 feet in the White mountains 

 of New Mexico, August 18, at flowers of Erigeron macranthus. 

 The writer has before him a pair collected at Fargo, North 

 Dakota, by O. A. Stevens, the male August 13, 1910, at flowers 

 of Solidago serotina (No. 2154) and the female July 31, 1910, at 

 flowers of Lactiica pidchella (No. 2023). The male agrees 

 exactly with the type in the U. S. National Aluseum except that 

 the mesoscutellum has two coalesced cream colored spots, the 

 labrum is cream colored basally (but becomes brownish apically), 

 the cream colored spots on the legs are slightly more extended 

 (on one hind tibia the basal and apical marks are connected by a 

 narrow line), and the flagellum is darker, being black above and 

 dark reddish brown beneath, with the third antennal joint con- 

 colorous with the rest of the flagellum. The female, which has 

 never been described, has the following characters : 



?. Length 6 mm. Black, rather shining. Head entirely black, clypeus 

 finely and closely punctured, the face, vertex, and cheeks more coarsely 

 and closely punctured, the thorax similarly but still more coarsely 

 punctured, all practically devoid of pubescence. Tubercles, and two spots 

 on the mesoscutellum which are coalesced to form a diamond-shaped 

 patch, cream color. Antennae black above, dark reddish below, joint 3 

 distinctly longer than 4. Legs black, the anterior femora and tibiae in 

 front, the first four tarsi, all the knees, and a line on middle tibiae in 

 front, reddish testaceous to yellowish red. Outer face of hind' tibiae 

 strongly tuberculate, the apex of the joint with three or four very short in- 

 conspicuous straight bristles. Tegulae shining dark red. Wings hyaline, 

 heavily darkened on a broad apical margin and in marginal and sub- 

 marginal cells, a clear area beyond the latter, nervures blackish, stigma 

 fuscous, basal nervure interstitial with transverso-medial. Abdomen 

 conical, black, the sides of tergite 2 with large cuneate cream colored 

 spots, 3 with similar spots, 4 with a narrowly interrupted band, 5 with a 

 complete band, the anterior margin of the bands on 4 and 5 emarginate 

 on each side. Pygidial area long, acuminate, not distinctly pubescent, 

 densely punctured. Venter shining black, sternite 4 with narrow curved 

 lateral cream colored lines. 



87 



