Fossorud Ili/menoptera of Nortli America. 437 



outwards, niucro as usual, no distinct mesial line; near where the ru- 

 gse or shallow furrows break up posteriorly into fossulets is an oval 

 mesial line, on each side of which are transverse ruga;. Fore femora 

 whitish on the outer and terminal half; two hind pairs black; two an- 

 terior pairs of tibiae white, lineated with black beneath, anterior tarsi 

 testaceous brown, posterior pairs darker. Tegulae testaceous, nervures 

 black; the usual lateral white lines on the sides of the abdomen, those 

 succeedim: the basal pair of short spots being distinctly geminate ; tip 

 bidentate black. 



Length. .3.0 inch. 



9 • Differs in its wider front, while the silvery pubescence is not so 

 distinctly limited above. The prothorax is usually immaculate, the 

 eves are much darker; the fore femora being black, slightly tipped 

 with white, and the fore tibiae only white at base , tip of abdomen tri- 

 angular, subacute, black. 



Length, .32 inch. 



Pennsylvania, Illinois, (Coll. Ent. Soc. Phil.). 



Its broad front, black antennae, black-tipped abdomen, and white 

 legs, the diverging parallel rugae at the base of the propodeum, and the 

 black scutellum, sufficiently distinguish this species. 



Oxybelus 4-notatus, Say. 



<). i-notatus, Say, Long's Second Exp. App. p. 338. (1834). 



Harr., Cat. Ins. Mass. p. 68. (1835). 



Smith, Cat. Hym. Br. Mus. iv. p. 390. (1856). 

 % . Front a little broader than in 0. emary hiatus ; ocelli further 

 apart, but the surface is punctured in the same manner; the eyes are 

 smaller, froDt densely silvery, interantennal ridge distinct and unusu- 

 ally prominent, compressed; mandibles black; scape of antennae black, 

 flagellum brown, subfuscous towards the extremity, sericeous. Pro- 

 thorax scarcely carinate, angular on the sides, touched with yellowish, 

 adjoining the yellowish tubercle. Thorax very densely and coarsely 

 punctured, not polished, dull colored, no mesial ridge present on the 

 scutellum or meta-scutellum, which last bears two mucronate, narrow, 

 small scutello-triangular, membranous appendages, which are much 

 smaller than usual. Spine very narrow, long, deeply grooved, entire 

 at tip. sides parallel, slightly irregular, but generally parallel, ridges 

 diverge on each side of the anterior half of the propodeum, limited 

 laterally by the usual oblique promineut ridge ; below are transverse 

 unequal ridges on each side of the broad, flat, triangular, mesial fur- 

 row. Tegulae testaceous, nervures dark ferruginous, femora black, 

 fore pair tipped with yellow; fore and middle tibiae yellow externally, 



