Fosso7-iaI Bymenoptera of Norili America. 360 



ferred to three distinct species as soon as the sexes are identified by 

 taking them while united. 



Col. Ten-.. (Coll. Ent. Soc. Phil.) Maine, (Packard.) Connecticut, 

 ( Norton). 



Thyreopus conspicuus. Pack. 



Qrabro conspicuus, Cross., Proc. iv. p. -ISO. (1S65.) 

 Col. Terr. (Coll. Ent. Soc. Phil.) 



Thyreopus succinctus, Pack. 



Qrabro succinctus. Cress., Proc. iv. p. 479. (1805.) 

 Col. Terr., (Coll. Ent. Soc. Phil.) 



Thyreopus vernalis, n. sp. 



9 . Head very short and broad, not one-half as long as broad. 

 Eyes reach behind the middle of the head, and the ocelli are set 

 farther back on the head than usual, and in a curved line upon a tri- 

 angular area, distinctly marked in front by two lines meeting to form 

 the apex of the triangle. Vertex depressed in front of the ocelli, a 

 well-marked mesial impressed line extends down to the antenna 1 

 groove; a slight long and silvery pubescence lines the orbits, not ex- 

 tending so high up on each side of the antenna! groove as usual, above 

 whicli are a few long, sparse, sandy hairs. Head broad in front, 

 rounded towards the insertion of the mandibles; clypeal region broad, 

 but short ; clvpeus shorter than usual, less than one-half as long as 

 broad, flattened, but slightly ridged, not carinated ; mandibles long 

 and slender, unequally bidentate; lower tooth the smallest. Antennae, 

 slender, scape dilated clavate, black, tip yellow; flagellum black, 

 hardlv clavate. sutures not well defined. 



Prothorax narrow, sides angular, but not dentate, mesial notch quite 

 well marked, flat on each side, not carinated, greenish yellow. Sur- 

 face of thorax finely, minutely and sparsely puueto-striated, with long 

 hairs arising from them ; a brown-yellow stripe on the meso-scutellum 

 and meta-scutellum ; on front part of the scutum is a long, distinct 

 impressed mesial line; no Bubmesial lines present. A large, very dis- 

 tinct lunate enclosure on propodeum, finely puncto-lineated on each 

 side of the broad, shallow mesial furrow, which below extends triangu- 

 larly towards insertion of abdomen, forming an unusually broad, 

 smooth, depressed area, while the two halves of the scutum are irregu- 

 larly striated, covered by an irregular net-work of ridges ; tegula* 

 black, as are the hinge-pieces of wings which last are clear, not clouded, 

 nervures bright ferruginous. Legs rather stout, femora unusually 

 swelled, black, tibiae rather short, thickening towards the tip; fore and 



PROCEEDINGS EXT. SOC. PUILAD. FEBRUARY, 1867. 



