40 Myron Harmon Szvenk 



a trapezoidal area, all three of the areas in different planes, and all 

 covered with a snowy white pruinosity which is conspicuous in certain 

 profile lights and apparent in any aspect. Hind tibiae moderately 

 tuberculate on the outer side and with three or four short slender incon- 

 spicuous setae at tip, the dense hair on the inner side of hind basitarsi 

 golden with the anterior margin thickly set with black bristles, the hair 

 on the femora very thin, ochreous with a scattering of very inconspicuous 

 black bristles on the hind femora. 



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



The peculiar conformation and pruinosity of the fifth ab- 

 dominal tergite is the ear-mark of this species, which in this char- 

 acter shows a slight resemblance to A^. depressicauda, but which 

 is otherwise very distinct from that species. It is apparently 

 most closely related to A^. sayi Rob., agreeing with it in antennal 

 structure, red face, etc., but differing at once in the yellow- 

 spotted, apically flattened and pruinose fifth abdominal tergite. 

 It also resembles A^. illinoiensis Rob., but the third antennal joint 

 is shorter than in that species and the face lacks the yellow of 

 the lower corners usually present in illinoiensis, while the fifth 

 abdominal tergite is differently shaped, though it has the yellow 

 spot. It is distinctly larger than the parva group and smaller 

 than the cressonii group. From the allied N. cyinbalariae Ckll., 

 it differs in the lack of yellow marks on tergites 3-4, no black 

 on enclosure, base of tergite i black right across, etc. 



Nomada (Nomada) angulata h. sp. 



?. Length 7 mm. Dark red, the cheeks behind, an ocellar spot, a facial 

 spot surrounding the bases of antennae and extending narrowly downward 

 in the clypeal sutures so as to form a semicircle, prothorax except 

 collar, large spots on mesosternum, metapleura and adjacent portions 

 of propodeum as far as the outer margin of the spiracle and a narrow 

 curved line under the spiracle, triangular area at extreme apex of pro- 

 podeum, line on middle of mesoscutum, depressed sides of mesoscutellum, 

 whole of metanotum except a narrow median streak, basal half and nar- 

 row apical margin of tergite i, the bases of the femora beneath, a broad 

 line on posterior face of hind tibiae, and whole outer face of hind 

 basitarsi, black. Antennae red, joint 3 about two-thirds as long as 4, 

 the scape thinly pale haired. Mesopleura, coxae, sternum, and extreme 

 angles of propodeum with very thin, short, silvery white hair. Wings 

 uniformly faintly clouded except for a clear spot beyond submarginals, 

 the nervures and stigma brown, the basal nervure slightly but distinctly 



40 



