Fossorial Ilymcnoptcra of North America. 95 



more finely punctured head and thorax ; enclosure of propodeuin 

 lunate, coarsely punctured, with Blight radiating rugae between the 

 punctures, behind much shioother than in the % , but still rough. 

 Legs and wings colored as in % . On second ring of abdomen the fasciae 

 are more oblique and ovate than in % ; those present on the third ring 

 very small, on fourth they never form a continuous band ; on fifth two 

 broad ovate fasciae meet nearly on median line ; tips much as in fore- 

 going species, very acuminate, deeply channelled, more so than in 

 O. Q-maadatus. 



Differs from the proceeding species in the more rugose propodeum 

 and otherwise as in t . In one specimen the fasciae on the third ring 

 are absent and it might thus be easily mistaken for C. Q-maculatits, 

 but the flatter abdomen, smaller size and a glance at the sculpturing 

 of the propodeum will distinguish it. 



Length of body, .36, head and thorax together .18 ; abdomen .16 

 inch. 



Maine, Packard. Mass., Sanborn, Shurtlefl', (Coll. Harris. Ent. 



Soc. Phil.). 



Group F. 

 Crabro pauper, n. sp. 



% . Head transversely cubical, much as in 0. parvulus little more 

 than one half as long as broad ; vertex more so than in C. parvulus, 

 antenna] groove deep, with a very distinct ridge on the clypeal region. 

 Clypeus large, long, being two-thirds as long as broad, distinctly 

 though not sharply carinated, larger than in C. parvulus. Mandibles 

 equally bidentate, black throughout. xVntenuae thick, scape clavate, 

 thickened sensibly towards the tip, above black, yellow at tip, beneath 

 basal half black, but towards the base becoming fuscous, terminal half 

 yellow ; second to fifth joints of flagellum toothed beneath. Surface 

 of body and thorax finely punctured and polished. 



On each side of the prothorax, separated by the mesial notch are 

 three ridges; that on the anterior edge forms a sharp carina, the 

 two behind are rounded above and diverge from the front carina, the 

 two anterior ones terminating in slight denticles. The scutum has the 

 anterior raphe and two submesial ridges well marked, the scutellum 

 is rather coarsely striated, black ; on the meta-scutellum is a conspicuous 

 yellow stripe. 



The mesial furrow on the enclosure of the propodeum is well 

 marked, broad, and widening towards the base, and again forms a 

 lozeuge-shaped area on the posterior portion ; each side of the 

 enclosure, which is long and large, forms a quadrant in shape, the 



