Fossorial Ui/menoptera of North America. 439 



Mesothorax convex above ; scutum quadrangular, somewhat shorter 

 than broad; scutellum about half as long as broad; meta-scutellum 

 very short, transversely long linear; enclosure of propodeum sub-tri- 

 angular, narrowing behind, with lateral notal ridges, and at the base 

 many numerous ridges slightly diverging from the middle on either 

 side, with a lateral, sharp, conical tubercle situated a little behind the 

 middle, in front of the middle pair of legs; flanks of the meso-thorax 

 bulging, being very convex, while those of the meta-thorax retreat sud- 

 denly and are flattened ; sternal portion of the meso-episternum more 

 produced than the rest of the thorax, and minutely dentated. Prima- 

 ries with the apex obtuse, outer margin convex as usual ; 1st costal 

 space very long and. narrow ; discal space long, the two lower sides 

 equal in length ; 2d costal with the lower sides nearly equal in length, 

 the inner hardly shorter than the outer side ; 1st subcostal space lon- 

 gitudinal, one-third as broad as long, irregularly five-sided ; 2d sub- 

 costal space very small, not reaching to the 2d costal, forming very 

 nearly an equilateral triangle, outer recurrent very sigmoid, the 3d 

 space five-sided, narrowing less than a half of its length upon the 2d 

 costal space ; 1st median space more than a third the length of the 

 wing ; 2d internal space one-third as broad as long. Secondaries long 

 and narrow, the recurrent that closes the basal internal space is 

 very oblique; coxae stout, long ; trochanters as long as the coxae are 

 broad; femora flattened, swelled beneath; tibiae and tarsi long and 

 slender; fore tibia with one large curved spur, larger than the two 

 middle tibial ones ; fore tarsi with lateral setaa, some being mere cilice ; 

 hind tibial spurs very slender, long, unequal ; 1st joint of tarsus quite 

 as long as the remaining ones, remaining joints long, triangular; lobes 

 setiferous. Abdomen a little longer than the head and thorax together ; 

 a little more than a third as broad as long; 1st joint about as long as 

 broad, sub-triangular; 2d joint beneath very much enlarged, obtusely 

 or acutely angulated on the anterior margin, convex, or somewhat flat- 

 tened on the lower surface ; tip curved downwards and inwards. The 

 anal stylets are rather large and prominent. 



In the narrowness of the body this genus is very different from Oxy- 

 belus. Its front narrowing to the clypeus, and the stout antennas with 

 the last joint excavated and flattened beneath, and the enlarged, basal 

 ring of the abdomen which is angulated in front, distinguish this 

 genus from its allies. 



