1903.] NATURAL SCIENCES OF PHILADELPHIA. 603 



black; cheeks black behind; abdomen long-oval, extreme base and 

 more of sides of first segment black; second segment with large sub- 

 pyriform (pointing mesad) yellow spots; spots on third segment pres- 

 ent, but concealed by the retraction of the segment; antennae wholly 

 red, third segment almost as long as fourth; postscutellum dull orange; 

 legs clear red, not blackened, except that the coxae are largely black; 

 general color of insect conspicuously lighter than in .V. cuneata. Lat- 

 eral black mesothoracic bands may be more or less indicated anteriorly. 



Ilab. — North Carolina, collector unknown. Two in Coll. of Acad. 

 Nat. Sci. Phila. Perhaps only a race of cuneata. but obviously different 

 in appearance from any in my large series of the latter, and also from 

 a very different region. 



The remaining species discussed in this paper have simple mandibles. 

 The two following are comparatively large red and yellow species, super- 

 ficially resembling A\ zebrata and A', vinda. 

 Nomada coloradensis, sp. n. 



S . — Length about 11 mm.; general build as in zebrata, except that 

 the head and thorax are somewhat smaller; head, thorax and legs 

 bright ferruginous ^^■ithout yellow, and with little black; abdomen fer- 

 ruginous, sculptured as in zebreita but less closely, leaving the surface 

 shining; first segment witli black at extreme base, half-way along 

 sides, and in basal sulcus, but no yellow; second and third segments 

 with very large pyriform bright yellow marks pointed mesad; fourth 

 segment with a yellow l^and, broadly emarginate in the middle ante- 

 riorly, and large lateral yellow spots; fifth segment with two yellow 

 spots; venter ferruginous, inmiaculate. Labrum with a slight median 

 longitudinal carina, and a small red tubercle on apical margin; facial 

 quadrangle square; a very little black about ocelli and on inner side of 

 antennal sockets; cheeks all red; antennae entirely red, third and 

 fourth joints subequal, flagellum robust; mesothorax very densely 

 punctured, with no black band; metathorax with a black l)and, broken 

 on apical part of enclosure; enclosure very large; sides of metathorax 

 somewhat angled, not hairy (in vincta they are also l)arc, but in zebrata 

 covered with pale golden hairs); tegula3 shining, rather sparsely punc- 

 tured; wings strongly yellowish, stigma ferruginous, ncrvures ferru- 

 ginous on basal half of wing, fuscous on apical; second submarginal 

 cell very broad above, third with its outer margin bent almost to a 

 right angle, its apex greatly narrowed; basal ncrvure a moderate dis- 

 tance basad of transverso-media! ; hind tibia* rough with black bristles; 

 pygidium broad shovel-shaped. 



Ilab.— Colorado, bearing numbers 566 and 34; no further particulars 



