WALSH — DESCRIPTIONS OF N. AM. HYMENOPTERA. 163 



The tf differs from the $ only as follows: — 1. The entire face, front 

 up to the ocelli, and clypeus, are yellow; and the mandibles, except their 

 teeth, and palpi are tinged with yellow. 2. The antennae are nearly as 

 long as the body, immaculate except the black tip, and except that 1st 

 joint of the scapus is yellowish beneath. 3. The parts of the thorax 

 that in $ are tinged with yellow are here yellow; and in addition there is 

 a large yellow spot on the upper part of the mesothoracic pleura, and an 

 indistinct yellowish vitta on its lower part; and the lateral disk of the 

 collare is yellow. Moreover the sutures are more generally and more 

 strongly black, and there is a black line dividing the two yellow spots on 

 the mesothoracic pleura. 4. The tip of the abdomen is almost micro- 

 scopically punctured and subpolished. Joint 1 is 3! times as long as wide, 

 and joint 2 is | longer than wide. The tip of joints 1-5 is yellow, less 

 widely and distinctly in each successive joint. In the venter the tip of 

 1-5 is yellowish. 5. In all 6 legs the tarsal joints are proportioned as 

 10, 6, 5, 2. 6. The wings are subhyaline, except that the principal veins 

 are clouded with brown, and the tip beyond the areolet in the front wing, 

 and a corresponding portion in the hind wing, is brown. The areolet is 

 also more strongly truncate in front, so as to be almost rhomboido-penta- 

 gonal, and the bullae are much less distinct. Length o* .4S inch. Front 

 wing o* .41 inch. 



One d\ taken at large ; one ?, bred from Hickory- wood infested 

 by the Coleopterous Cerasphorus cinctus^ Fabr., and one ? from 

 Coll. Ent. Soc. The genus may perhaps inhabit other timber- 

 trees as well, but like the genus Carya (Hickory) it seems to be 

 peculiar to America, the only other known species — rufus, Brulle 

 — occurring in Guiana. Bridle's specimen was taken in Caro- 

 lina. His specimen ($) approximated to the 6* somewhat more 

 than mine in the yellow markings of the mouth and thorax, and 

 he says nothing of the hyaline markings of the wings, nor of the 

 black tip to the ovipositor. This is the only Ichneumonidous 

 species known to me where the abdomen is more strongly sculp- 

 tured and more opaque behind than before. 



Genus ODONTOMERUS, Gravenhorst. 



There are here three very distinct but very small bullae, C, D, 

 and E — C and D widely separated from each other, and E rather 

 nearer to the angle of its vein than to the areolet — besides two 

 indistinct semi-bullae occupying the position of A and B. It is 

 singular that Say should have noticed the bulla? in Od. mellipes, 

 when they are so very much more obvious in many other species 

 where he has said nothing at all about them. 



