Studies of North American Bees 41 



basad of transverso-medial nervure. Abdomen dark red, except the 

 black base and apical margin of tergite i, the apical margins of tergites 

 1-4 broadly smooth and shining, tergite 2 laterally with large subpyri- 

 form suffusedly paler spots which at places are distinctly yellowish, indi- 

 cating spots probably wholly yellow in some specimens, 3 with similar but 

 smaller spots and 4 with tiny ones. Hind tibiae distinctly tuberculate 

 on outer margin, apically with three or four slender inconspicuous setae, 

 the inner side of hind basitarsi with pale gray hair very broadly edged 

 with black bristles on anterior margin, the hair of the femora mostly 

 pale. Tergite 5 with the apical margin somewhat reflexed and medially 

 slightly produced so as to form an obtuse angle in profile, the reflexed 

 area between the outer ends of the angle slightly flattened and thinly 

 whitish pruinose, this pruinosity obvious in certain lights but not apparent 

 in others, the sides of tergites S and 6 with black bristles, curved on 6. 



Type. — Sioux county, Nebraska, May (L. Bruner), 5. 



Apparently this species is closely related to N. velutina, just 

 described, and for a time the writer was inclined to consider it 

 but a variation of that species, but the entirely different shape 

 of the flattened pruinose area on tergite 5, the much darker red 

 color, the less defined blackish apical margins of tergites 2-4, the 

 black hind basitarsi with gray rather than golden hair within, etc., 

 seem to form good specific criteria. It is even closer to A^. sayi 

 Rob., than is velutina, but the shape of the fifth abdominal tergite 

 is very different than in that species, which has it transverse on 

 the apical margin and not depressed or pruinose but terminating 

 with a thin pale fringe. 



Nomada (Nomada) vicinalis Cresson. 



1878. Nomada vicinalis Cresson, Trans. Am. Ent. Soc, VII, pp. 



78-79, c?._ _ 

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



74 and p. 84, c?. 

 1905. Nomada vicinalis infrarubens Cockerell, ibid., p. 84, <^. 



This species was described from two male specimens from 

 Colorado, collected by Alorrison. A male from Warbonnet 

 canyon, Sioux county, Nebraska, collected May 29, 1901, by 

 ^I. A. Carriker, is quite obviously a variety of A'', vicinalis, agree- 

 ing precisely with Cresson's description of that species except 

 that the venter is wholly red without any yellow spots or bands, 

 tergite 6 is without an obvious yellow band, and the base of the 



41 



