400 Dr. A. S. Packard, Jr's Revision of the 



of the clypeus, which is subtriangular, and above, very broadly so ; 

 front edge transverse, nearly straight, the front contracts rather rapidly 

 towards tbe clypeus ; between the insertion of the antennae a slight 

 mesial carina; antennae subclavate, almost filiform, black, mandibles 

 black, hirsute at base. Prothorax well carinated on the anterior edo-e, 

 behind densely hirsute; mesoscutum dull, densely puncto-lineated ; 

 mesial and submesial grooves distinct; meta-scutellum hirsute; propo- 

 deum with a broadly triangular, very transverse enclosure, with three 

 high ridges on each side of the mesial line; bottom of the fossae broad 

 and highly polished; mesial furrow very small, contracted, sublozenge- 

 shaped, nearly obsolete beyond the enclosure, with irregular transverse 

 rugae at bottom; posteriorly the rather tumid sides are covered with a 

 coarse net-work of broad shallow fossulets, with a long thin, fiue hir- 

 suties. Tegulae and base of wings dark brown, nervures black; pteros- 

 tigma black-brown, legs black, base and tip of tibiae brown-black; tarsi 

 fuscous, rather light. Abdomen nearly twice as long as the head and 

 thorax together; pedicel longer than the width of the abdomen, grooved 

 inside, polished; the body of the abdomen oval acute, longer than the 

 head and thorax together, being of unusual length; sutures very 

 slightly impressed ; hind edge of the rings slightly emarginate, hirsute 

 posteriorly; edge of tip slightly emarginate on the sides; penis exserted, 

 upcurved. 



Length of body, .18; head and thorax, .07; abdomen, .11 inch. 



The 9 differs in its more cubical head, clavate antennas, longer carina, 

 thinner pubescence on the front, which is wider, in the more polished 

 surface of the head and thorax ; the propodeum is less striated, and the 

 legs are uniformly black-brown, the tarsi scarcely paler, tibial spur 

 white. 



Length of body, .18; head and thorax, .08; abdomen, .10 inch. 



Virginia, Ridings, (Coll. Ent. Soc. Phil.). 



Differs in its larger size, the unusually long pedicel of the abdomen, 

 the puncto-lineated surface of the thorax, especially marked in the 

 male, and which does not usually occur except in Say's P. mellipes, 

 which he states is longitudinally striated. It also differs in the 2d 

 subcostal cell being broader and squarer, and less trapezoidal than 

 usual. 



Psen elongatus, n. sp. 



9 . Head subcubical, sides retreating more posteriorly than the two 

 preceding species; vertex high, convex; ocelli placed in an equilateral 

 triangle, not very contiguous; front much broader than usual; eyes 



