96 Myron Hannon Szvenk 



British Museum and has identified specimens of this species from 

 Wisconsin, New York and Colorado. Four Nebraska males 

 before the writer are the same as the specimens from Wisconsin 

 and New York determined by him, which are now in the U. S. 

 National Museum. Two of the Nebraska males were collected 

 at Cedar Bluffs in company with six specimens of lepida and 

 seventeen specimens of carolinae. Another male was taken at 

 Bellevue, ]May 9, 1908, in company with two males of lepida, 

 while the fourth male was collected at Lincoln, April 28, 1901, 

 on plum blossoms in company with eight females and four males 

 of lepida and one female of carolinae. It would not prove sur- 

 prising if alhofasciata eventually proved to be simply another 

 extreme variation of the plastic A^. lepida. 



Nomada (Gnathias) siouxensis n. sp. 



?. Length 9 mm. Light red ; a large oval spot above insertion of 

 antennae, a similar spot involving ocelli, the cheeks except for a broad 

 orbital line, most of propleura, an X-shaped area on mesosternum which 

 extends up in the pro-mesopleural suture, whole of metapleura, posterior 

 face of last four coxae, bases of all of the femora more or less, sutures 

 about wing bases, and a median line on mesoscutum and propodeum, 

 sharply contrasting black. Clypeus, lower sides of face, labrum and 

 mandibles conspicuously suffused with yellowish. Antennae red except 

 a black line on scape behind. Tegulae red. Wings moderately darkened 

 about marginal and submarginal cells and on apical border but with a 

 clear area between, the nervures fuscous, stigma dark brown, basal nerv- 

 ure much basad of transverso-medial nervure, third submarginal cell 

 much narrowed above. Abdomen light red except for a small black area 

 at extreme base, immaculate. 



Type. — Warbonnet canyon, Sioux county, Nebraska, June 21, 

 1901, on "borage" (M. Cary), $. 



This species is allied to A^. louisianac Ckll., but differs in larger 

 size, paler red coloration, shape of black mark on propodeum and 

 lack of spots at base of abdomen. From A'", rhodalis Ckll., it 

 differs in the possession of a median line on mesoscutum, of a 

 black area at extreme base of abdomen above but none on the 

 ventral side, and the third submarginal cell much narrower above 

 than the second. From N. perplexa Cresson, it differs in the 

 light red head and thorax, the scape light red in front, the 



96 



