Fossorial ITi/menoptcra of North America. 97 



Two % specimens from Maine differ from those described above, in 

 being a little longer and slenderer, scape blacker; hind tibia? a little 

 blacker within. One of the specimens has no yellow stripe on the 

 meta-scutellum; the band on the front edge of the sixth abdominal 

 ring is a little larger and better marked aud the abdominal fascia? in 

 front are smaller. 



Crabro denticulatus, n. sp. 



% . Head much as in C. pauper, but the eyes reach farther back 

 on the vertex, which is flatter, otherwise the shape and puueturation 

 of the head is much as in C. pauper. Clypeal region silvery, clypeus 

 longer than in the other species, subacutely produced. Antennae long 

 aud slender, scape almost entirely yellow, slightly stained with brown 

 on the inside ; second joint of flagellum one half as long as scape, 

 with two remote, acute, prominent teeth on the under side, the basal 

 one the larger ; remaining joints separated by slight sutures, black ; 

 mandibles black, smoother than in G. pauper. 



Prothorax not very broad, rounded at the sides, a convex ridge on 

 hinder margin. Meso-thorax finely puncto-striated, submesial ridges 

 slight, between which the surface is plainly depressed; parapsidal 

 grooves distinct though minute ; two yellow dots on each side of the 

 front edge of the scutellum, a transverse stripe on meta-scutellum. 

 On meta-scutellum a lunate enclosure with five rugae on each side of 

 broad mesial furrow, at the base of which is an abbreviated ridge. The 

 sculpturing of the meta-thorax on much the same plan as in C. pauper, 

 but the posterior ovate areas are crossed thoughout by oblique ridges. 

 Wings as in the proceeding species. Fore and middle femora black, 

 tipped broadly with yellow; hind femora entirely black; fore tibia? 

 yellow, slightly stained with pale fuscous brown on the inner side ; 

 middle tibia? with an ovate black spot near the tip, aud the hinder 

 pair arc yellow tipped with black : fore and middle tarsi yellow, tinged 

 slightly with fuscous, ungues brown; hind pair yellow on basal half of 

 first joint, beyond glaucous brown. 



Abdomen as li »ng as the head and thorax together, with ovate fascia? on 

 the second to fifth segments, the spots acute inwards, not very remote 

 from each other, those on fifth ring forming a continuous band. 



Length of body, 34 j of head and thorax together, .17; abdomen, 

 .17 inch. 



Virginia, Hidings, (Coll. Ent. Soc. Phil.). N. Y., (Mr. Norton). 



Closely allied to ft pauper , but differing in the sculpturing of the 

 aetathorax, in that the fore femora are broadly tipped with yellow, 



PBOCEEDINGS KNT. SOC. PHILAD. MAY, 1866. 



