WALSH DESCRIPTIONS OF N. AM. HYMENOPTERA. IOI 



nearly triangular, pale brown, twice as long as wide. Areolet large, pen- 

 tagonal, the 2d recurrent vein entering it at | the way to its tip. Length 

 ^.17 ? .12 inch. Front wing o* ? .13 inch. 

 Two d", one ?. 



[Ol'thOCentms] Stigmatias, n. sp.— $.— Differs from the above $ only 

 as follows: — i. The face and the lower surface of the scape are yellowish- 

 white (not white), and the entire rlagellum is dull rufous or pale yellow- 

 ish rufous below. Joints of the flagellum a little shorter. 2. The meso- 

 sternum is sometimes entirely black. 3. The 3 fasciae on the abdomen are 

 narrower, darker and much less distinct, that on joint 1 sometimes obso- 

 lete. 4 The 1st abdominal joint has its sides gently concave on its mid- 

 dle i, but elsewhere convex, their general direction being straight. 5. 

 The hind legs are of a darker rufous. 6. In the wings both the veins and 

 stigma are black, the stigma a little hunched on the costal margin, and 

 very strongly hunched on the side adjoining the discoido-cubital cell, so 

 as to describe a circular arc of 45 . Areolet the same, but with its outer 

 vein so slender and pale as to be only visible in certain lights. Length 

 2 .15 inch. Front wing § .12 inch. 1 



Two $ ; 0" unknown to me. But for the different structure 

 of the 1 st joint of the abdomen and the hunched stigma, this 

 might be taken for a variety of the preceding. 



Genus CERATOSOMA, Cresson. 



The swelled face, which projects beyond the eyes by a space 

 about equal to f their shorter diameter, shows the connection of 

 this most anomalous genus with Exochus, etc. Air. Cresson has 

 omitted to notice one of its most remarkable characters, viz. : 

 that the mouth is rostriform as in Osprynchotus, Spin., and Lapton, 

 Nees, and in the Braconide genera Agathis and Vipio. The cly- 

 peus and mandibles are also larger and more prominent than com- 

 mon, but the mandibles have the usual subequal teeth, instead of 

 being destitute of teeth, as they are described in the two Ichneu- 

 monidous genera named above. Occasionally this rostrum is a 

 little retracted, but ordinarily it projects beyond the clypeus by a 

 space equal in length to the longer diameter of the eye. Mr. 

 Cresson speaks of a " small tooth near the tip of the tarsal claws " 

 o* 2 . This tooth exists only in ? , and it is long, acute and slender, 

 and placed on the middle of the claw beneath. In the cT the ter- 

 minal \ of the claw bears, not a tooth, but 7 or 8 fine, long pec- 

 tinations. I am not aware of any other example in Ichneumoni- 

 dce where sexual differences exist in the armature of the tarsal 

 claws. The genus is further remarkable by the entire body being 



