1865.] 181 



with yellowish; the two round spots before the middle coxae are yellow; 

 the anterior wings have a fuscous cloud at their apex ; the fifth segment 

 of the abdomen has a continuous yellow band, the remaining segments 

 immaculate and pubescent, and the apical segment obtusely pointed 

 and depressed. Same size as the female. 



Collection. — Ent. Soc. Philad. % ; Dr. J. Gundlach 9 . Five speci- 

 mens. 



Nomada flaviceps, n. sp. 



Pieeous-black ; most of head, collar, tubercles, tegulfe, large mark on pleura, 

 scutellums, two spots on metathorax, most of legs, and three bands on abdomen 

 above, bright yellow ; wings subhyaltne, apex fuscous. 



Male. — Head bright yellow, polished, with a few very indistinct scat- 

 tered punctures; a large quadrate spot, commencing at the insertion of 

 the antennas, extending back and covering the ocelli, the labrum, tips 

 of mandibles, throat, and the extreme posterior margin of the cheeks, 

 piceous-black ; a minute spot before each posterior ocellus and two ap- 

 proximate spots before the anterior ocellus, yellow ; antennas nearly as 

 long as the head and thorax, rufo-piceous, the tips blackish. Thorax 

 piceous-black, polished, the mesothorax finely and sparsely punctured, 

 pleura apparently impunctured; collar, tubercles, tegulas, and a large 

 mark on pleura deeply emarginate beneath, bright yellow; scutellum 

 subbilobate, entirely bright yellow, as well as a minute spot on each 

 extreme basal corner and a transverse line on postscutellum ; metatho- 

 rax very finely punctured, slightly pubescent, with a subtriangular 

 yellow spot on each side behind. Wings pale fusco-hyaline, faintly 

 iridescent, a fuscous cloud at the extreme tip ; nervures pale ferrugi- 

 nous, stigma and the costal nerve of the marginal cell yellowish-fulvous. 

 Legs yellowish ; coxae piceous, with a yellow spot beneath, very large 

 on the posterior pair; the tour anterior trochanters and femora dull 

 ferruginous; posterior trochanters and femora except tips, fuscous; tips 

 of tarsi dusky. Abdomen piceous-black, smooth and polished, slightly 

 pubescent; a broad, continuous, bright yellow band on the middle of 

 the two basal segments and a narrow one on the fourth, almost hidden 

 by the third segment; apical segment depressed and obtusely pointed; 

 beneath, the third segment has a continuous, bright yellow band, gra- 

 dually attenuated on the middle posteriorly. Length 4 lines; expanse 

 of wings 7 lines. 



Collection. — Dr. J. Gundlach. One specimen. 



This elegant species is allied to A r . cubensis, but is easily distinguished 

 by the sparse punctation and the almost entirely yellow head; the 

 markings of the abdomen are also different. 



