Studies of North American Bees 71 



c?. Length 9 mm. More slender than the ?. Black, opaque; the face 

 below level of antennae except black curved lines encroaching in the 

 upper clypeal sutures, scape in front, labrum, mandibles except tips, 

 inferior orbits extending a short distance upward behind eye, collar, 

 tubercles, tegulae, elevated portions of mesoscutellum and metanotum, a 

 large transverse irregular patch on pleura which is much narrowed in 

 the middle, tiny dot below wings, small spots on the sides of propodeum, 

 broad complete bands on tergites 1-6 which are fairly even except on 2 

 where the band is considerably narrowed medially, urn-shaped mark on 

 sternite i and broad bands involving most of sternites 2-6, and whole of 

 apex, bright lemon yellow. Antennae bright red, above with a blackish 

 line, joint 3 slightly less than one-half as long as 4. Head and thorax 

 coarsely, closely and shallowly punctured, very sparingly short thin pale 

 haired on cheeks, lower pleura, mesoscutellum and sides of propodeum. 

 Legs yellow, strongly suffused with reddish on trochanters and femora; 

 the coxae behind, last four trochanters behind, middle femora behind, 

 whole of posterior femora except knees, and stripes on last four tibiae 

 behind, black or blackish. Wings hyaline, feebly darkened apically, nerv- 

 ures and stigma yellowish, basal nervure interstitial with transverso- 

 medial. Apex feebly notched. 



Type. — West Point, Nebraska, $. 

 Allotype. — Type locality, J*. 



Nomada (Heminomada) fragilis Cresson. 



1878. Nomada fragilis Cresson, Trans. Am. Ent. Soc, VII, p. 79, c^. 

 1903. Nomada (Xauthidium) fragilis Cockerell, Proc. Acad. Nat. Set. 



Phil., p. 593, c?. 

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



73, <S- 

 1907. Nomada fragilis Cockerell, University of Colorado Studies, IV, 

 p. 248, c?. 



The writer recognizes this species, hitherto recorded only from 

 Colorado and New Mexico, in two males from Sioux county, 

 Nebraska, collected in the Bad Lands at the mouth of Monroe 

 canyon, May 28, 1901, on Homalohus tenelhis, by L. Bruner. 



SPECIES FROM OUTSIDE NEBRASKA 



Nomada (Heminomada) alpha Cockerell, var. 



1905. Nomada alpha Cockerell, Bull. 94, Colorado Exp. Sta., pp. 

 84-85, ?• 

 This species was described from a unique female type col- 

 lected at Fort Collins, Colorado, May 20, 1903, at flowers of 



71 



