Fossorial Hymenoptera of North America. 435 



Illinois, (Coll. Ent. Soc. Phil.). North Carolina, (Hentz, Harr. 

 Coll.). 



This is the largest and stoutest species yet known to us. Its red 

 antennae and the red tip of the abdomen, the very short black legs, 

 with dark tarsi, except the reddish unguinal joint, the very short and' 

 broad abdomen, scarcely longer than the thorax, the shiny crust, and 

 quadrant-shaped yellow spot on the scutellum. will further distinguish 

 it. Its head is also higher and more convex on the vertex, less coarsely 

 punctured and less thickly pubescent tban in 0. mucronatus. 



Our specimens agree well with Say's description, though nearly 

 twice as larire as his, which, according to his statements, measured one- 

 fifth of an inch. Otherwise, except in not noticing the regular, quad- 

 rant-shaped yellow spots in the meso-scutellum, our specimens corres- 

 pond well. 



A specimen of 0. Isetus collected by Hentz in North Carolina, has 

 the antennae entirely fuscous, and the quadrant-shaped spots much 

 smaller than in the specimens from Illinois. 



Oxybelus analis. Cresson. 



0. analis, Cress., Proc. iv. p. 149. (1865). 



Cuba, (Coll. Ent, Soc. Phil.). 



Oxybelus emarginatus, Say. 



0. emarginatus, Say, Bost. Jour. Xat. Hist., vol. i, p. 375. (1837). 



Harr., Cat. Ins. Mass. p. 68. (1S55). 



Smith, Cat. Hym. Br. Mus. iv. p. 390. (1S56). 

 9 • Front very narrow, densely puuetured, punctures of moderate 

 size, silvery from the ocelli down ; head a little shorter and vertex a 

 little more elevated and convex than in 0. analis; clypeal region 

 longer than usual, mandibles testaceous reddish, outer fourth blackish ; 

 antenna? short and stout, scape black, two terminal joints testaceous at 

 tip; flagellum glaucous brown above, sericeous; beneath whitish tes- 

 taceous. Prothorax well carinated, angular on the sides, smooth above, 

 sericeous, pale yellow on the sides, meso-scutum densely, coarsely punc- 

 tured, pilose, scutellum with a raised mesial line, and remote lateral 

 yellow dots on each side ; meta-scutellum with a mesial ridae. and a 

 few transverse rugae on each side; membraneous expansions oval emar- 

 ginate. with a sharp latero-terminal mucro excavated at the end. Pro- 

 podeal spine large, square, broadly bifurcate at tip. surface channeled, 

 with high, thin sides. Propodeum with fine, regular rugje diverging 

 from the base, limited posteriorly by an oblique lateral ridge; posteri- 

 orly the rugae run transversely on each side of the mesial furrow into 

 an elongated hexagon. Teaula? reddish testaceous; nervures dark 



