92 THE ENTOMOLOGIST. 



NEW AMERICAN BEES.— VIII. 

 By T. D. a. Cockerell. 



Nomada vexator, n. sj). 



? . Length, 7 to 8 mm. ; ferruginous red ; head, thorax, and 

 legs marked (not heavily) with black, but with no yellow ; abdomen 

 shining light ferruginous, with no black except three spots (one basal 

 and two lateral) on first segment, and even these sometimes hardly 

 developed ; second abdominal segment with a variable but always 

 large cream-coloured patch on each side ; third segment with much 

 smaller spots, sometimes reduced to dots ; fourth with two transverse 

 subdorsal spots, sometimes absent ; fifth with a pair of large spots, 

 usually confluent ; apex with a rather narrow band of silvery tomen- 

 tum. Antennae entirely clear ferruginous, third joint a little longer 

 than fourth, flagellum rather thick ; mandibles simple ; first joint of 

 labial palpi much longer than the other three united ; middle of face, 

 connecting with a large area enclosing ocelli, and hind part of cheeks, 

 black ; scutellum strongly bilobed ; mesothorax very densely punc- 

 tured, with a median black band, broadening anteriorly ; metathorax 

 .with a black band, and its sides with white hair ; tegulae bright 

 ferruginous ; wings dusky hyaline,- clear subapically and strongly 

 dusky at apex ; stigma ferruginous, nervures fuscous ; b. n. meeting 

 t. m. ; second s. m. large, receiving the r. n. far beyond its middle ; 

 third s. m. naxTowed greatly above ; tibiae and tarsi without black, 

 but the femora marked wath black, especially the hind ones ; venter 

 of abdomen red without markings. In my table of Rocky Mountain 

 Nomada (Bulletin 94, Colo. Exp. Sta.) this runs nearest to N. luteo- 

 incta, but differs in the proportions of the antennal joints, and the 

 pale yellow abdominal markings. The same characters, and the 

 venation (b. n. meeting t. m.) readily separate it from N. cymbalarice 

 and N. mera, which run to the same point in the table. In many 

 respects N. vexator resembles N. acccpta, but the abdomen is much 

 darker and more copiously ornamented with cream-colour in accepta, 

 while the mesothorax is three banded, and there are yellow spots at 

 the lower corners of the face. 



$ . Length, 7 mm. ; head and thorax black, without any red ; 

 both densely punctured, and with quite abundant white hair, which 

 is appressed and bright silvery on face ; thorax with no light mark- 

 ings except a cream-coloured spot on the tubercles ; clypeus with the 

 lower half (narrowest in the middle), lateral marks sending linear up- 

 ward extensions to level of antennae, scape in front, labrum, and 

 mandibles except apex, light yellow ; third antennal joint about as 

 long as fourth on upper side, but much shorter below ; scape and first 

 four joints of flagellum black above, remaining joiiats showing succes- 

 sively decreasing infuscation : legs red, anterior and middle femora 

 black basally beneath, hind femora black with the apex red ; second 

 s. m. narrower than in female, receiving r. n. in middle ; abdomen 

 marked nearly as in female, but basal half of first segment nearly all 

 black, and blackish transverse stains on third and fourth ; apical seg- 

 ments with thin white pubescence ; apical plate very narrow and 



