228 Mr. T. D. A. Cockerell — Dcscripliouft ami 



autcniite wholly black ; head broad ; clypeus squarely trun- 

 cate, the sides sloping away, and presenting a concave edge 

 on each side of the truncation ; two little tufts of orange 

 liair beneath clypous ; tcguhe sliglitly reddish, with a broad 

 jnmctate marijinal or submarginal area. Wings sligl)tly 

 stained with l)iown, with conspicuous stains in the marginal 

 and first submarginal cells ; b. n. meeting t.-ra. ; first r. n. 

 joining second s.m. far from its base, the distance being 

 quite as great as the length of the first t.-c. ; second r. n. 

 joining second s.m. not far from the end. Legs black, with 

 bhick iiair ; hind spurs straight. AI)domen rather broad and 

 convex, well punctured; hair on first segment above, and 

 basal middle of second, long and white, rest of hair, including 

 ventral scopa, black. Allied to O. grandior, Ckll., but the 

 colour of the thoracic hair above is quite different, and it is 

 not nearly so large. The general appearance is quite like 

 (). nigrifruns. Cress., but gaillardice differs from that in having 

 the punctures of the third abdominal segment much more 

 distinct and separate, the hair at sides of metathorax white, 

 a t\ift of long white hair on and around tubercles, and the 

 sides of face greener. 



Hub. Boulder, Colorado, at flowers of GaUIardia, July 6, 

 1905 (ir. P. Cuckcrell). 



O.smia Wilmattce, sp. n. 



? . — Length a little over 9 mm. 



Dark indigo-blue, the mesothorax slightly greenish, and 



abdominal segments 2 to 4 with brassy tints ; head and 



thorax extremely densely punctured ; head rather large ; 



mandibles very broad, with two sharp teeth, and a broad, 



obscurely bieuspidate, inner tooth ; lower edge of clypeus 



straight and simple ; no brushes of orange hair under margin ; 



antenme black; hair of face abundant and coarse, entirely 



black, as is also that of cheeks ; front (the tegument) black ; 



hair of vertex black, giving way to white on occiput; hair of 



pleura black, but of tubercles, tuft behind wings, and sides of 



metathorax white, of thoracic dorsum white, with black hairs 



rather copiously intermixed, producing a grey effect; tegulse 



black, with a blue spot in front, submarginal area densely 



punctured. Wings dusky; b. n. meeting t.-m.; first r. n 



joining second s.m. about the end of its first third, second 



r. n. joining it about the beginning of its last sixth. Legs 



black, with black hair, but that on anterior and middle tarsi 



largely pallid. Abdomen well punctured, shining, with short 



black hairs ; that on first segment long and white, and on 



