



Fossorial Ilymcnoptcra of North America. 75 



Abdomen coarsely punctured, wings unusually convex in the middle, 

 edges emarginate, four pairs of sinuate fasciae on the four basal rings, 

 and two continuous bands on each succeeding ring; two basal fasciae 

 most sinuate and slender, those on the fourth ring are more approxi- 

 mate than those on the two proceeding rings; the broad large band 

 on the fifth ring is sometimes separated into two fascia) ; terminal 

 linear band sometimes absent. Beneath black, and a little testaceous 

 on the hind edge of terminal rings. 



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



9 . Differs in having the head more cubical, not narrowing be- 

 hind, the surface above is broad and slightly convex; ocelli in a 

 curved line, or very low triangle; eyes smaller and front more con- 

 tracted than usual ; orbits lined with a silvery pubescence as on cly- 

 peal region; clypeus a little shorter than broad, carinated mesially; 

 antenna? short and clavate; coloration as in £ , except that the five fasciae 

 are ovate and removed a considerable distance from the mesial line; 

 enclosure of propodeum well marked, subluuate. 



Length of body, .42; head and thorax together, .22; abdomen 

 .20 inch. 



Mass., Canada, 111., N. J. (Coll. Ent. Soc. Phil.) Mass., (Coll. 

 Harris, Sanborn and Shurtleff.) Conn., (Norton.) Dublin, N. H., 

 Leonard, (Harris Coll.) Va., Ridings, (Coll. Ent. Soc. Phil.) 



This species is of moderate size and readily distinguished by its 

 coarsely punctured body, by the convexity of the middle portion of 

 the abdominal rings, by the black femora tipped with yellow. Some- 

 times the prothorax is entirely black. 



St. Fargeau undoubtedly had the female of this commonly diffused 

 species in view when he described his So/ruins interruptus in 1834, in 

 this description he anticipated Say whose description was published in 

 1837. 



Should Tlvjreopus be considered as but a section of Crabro, then 

 the name Thyreopus interruptus of St. Fargeau, Ann. Soc. Ent France, 

 iii. 755, 2 % , will have to be dropped for some other name, as in the 

 same article, page 716, he describes the present species under the 

 name of Solenius interruptus. 



A specimen from Brunswick, Me., has a smooth body, especially the 

 abdomen, the basal pair of fascia) nearly obsolete, the other fascia) 

 broader aud separated farther apart than usual. 



A % specimen from Western Virginia, collected by Mr. Ridings, 

 has the mandibles entirely black, the upper side of the scape and an- 



