

Fossorial llymcnnptera of North America. 441 



three longitudinal, oval, lanceolate fossa), -with five transverse rugae, 

 femora black, tipped with pale red, coneolorous with the rest of the 

 legs. Abdomen with two broad reddish patches, excavated on their 

 opposite faces; two other pairs of linear reddish fascia); edges of rings 

 testaceous. 



Length, .40 — .50 inch. 



Illinois, ((Boll. Ent. Soc. Phil,). Louisiana, (Norton). 



This species is characterized by the unusually long spine on the tes- 

 taceous tubercle of the propodeum, the abdominal spots are more 

 equal, antenna) paler, a slight golden pubescence on the thorax, and 

 the edge of rings of the abdomen are more distinctly testaceous than 

 in N. laterale. 



DESIDERATA. 



Nysson 5-spinosus. Say, West. Quart. Rep. ii, p. 78. 

 "Arkansas," (Say). 



Nysson armatus. Cress.. Pmc. iv. p. 145. (1SG5). 

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



STIZUS, Latr. 

 Stizus, Latr., Gen. Crust, et Ins. iv. p. 15U. (1804). 

 Hogardia, St. Farg., Hym. iii. p. 290. 



9. Head above broad oblong; vertex not acute; ocelli placed in 

 an equilateral triangle below the summit of the vertex ; front a little 

 narrower, sides more parallel than in Larra ; supra-clypeal piece 

 slightly carinated; clypeus large, broad, subtriangular, full, surface 

 convex; front edge very slightly excavated; labrum short, very broad, 

 sublunate ; mandibles incurved, unusually broad and thick, trigonate 

 at base, very unequally bidentate ; lingua short; palpi short and broad, 

 thick; antenna) with the second joint of the scape very short, sub- 

 spherical ; antenna) long, clavate, thickened towards the tip. Thorax 

 subspherical ; propodeum with the sides rounded, uniformly curved, 

 with a dense hirsuties. Legs very short, joints thickened, short, 

 strongly spined ; wings compared with Larra very short and broad, 

 triangular, outer edge being long and very oblique. Abdomen not 

 much longer, one-fourth, than broad, being shorter than usual ; above 

 cylindrical, much rounded, beneath somewhat flattened; tip acute, 

 with a distinct, large, long, stout sting. 



The species are of large size, being the largest of the group, and are 

 easily known by the hirsute body, stout legs, triangular silvery clypeus, 

 and the very long transverse vertex. The propodeum has a faintly 

 marked triangular enclosure. 



PROCEEDINGS ENT. SOC. PHILAD. FEBRUARY, 1S67. 



