ICHNEUMONTD.^. 301 



or less dusky at tips; abdomen convex, the basal segment broadly dilated at 

 tip, subeonvex, shining, not rough; apical half of all the segments yellow; the 

 apical segments are often indistinctly banded. Length 5 — SV lines. 



Hab. — Mass., Conn. Fifteen % specimens. Very much like hxUis Brulle, but 

 is smaller and more convex. 



I. comes. — This species is distinguished by the a??/erior part of the second and 

 tliird segments of the abdomen being more or less yellow. The type sjiecimen is 

 larger and more robust than usual and is the only specimen out of 35 that has 

 the yellow longitudinal lines fully developed, i. e. extending to the anterior 

 margin and joining the sutural line on each side; generally the mesothorax is 

 immaculate and the lateral sutural lines more or less distinct, often reduced to 

 a mere dot just before the tegulae; some specimens have a yellow spot on tlie 

 disk of the mesothorax and others two short lines. The scutellum is always 

 yellow, but the post-scutellum is occasionally black. The metathorax varies 

 from immaculate to more or less yellow; the four anterior femora are often 

 more or less black behind; the posterior cox^ are sometimes varied with yel- 

 low, while in other specimens the four anterior coxse are more or less black. 

 The basal segment of the abdomen is always black, sometimes wi h a yellow 

 dot on each side of the dilated tip; the second segment generally has its ante- 

 rior one-half or two-thirds yellow, with the posterior margin of the yellow band 

 ol'ten undulate or uneven, occasionally the yellow extends almost to the tip of 

 the segment, which is more or less unevenly marked with black; the third seg- 

 ment is sometimes entirely yellow, sometimes with the posterior margin nar- 

 rowly black, sometimes with only a black dot on each side, sometimes the jjos- 

 teriiir one-third to one-half is black; four specimens from West Virginia have 

 tlie yellow bands on the second and third segnients narrow and more or less ob- 

 scaue : the fourth and following segments are generally entirely black, but in 

 two or three specimens the sides of the fourth segment are more or less distinct- 

 ly marked with yellow, and three specimens, identical with the aleatorius of 

 Harris' Catalogue, have a triangular yellow mark on each side of the fourth 

 segment, almost contiguous in one specimen; occasionally the pleura has a 

 more or less developed yellow spot on each side; the wings vary from hyaline 

 to dusky. Length 7- — S^ lines. Tiiirty-five '^ specimens from Can., Mass., Del., 

 W. Va. and Ills. 



I. feralis. — 9 • Black, head quadrate, not narrowed beneath; face sometimes 

 more or less brownish; antennse short, robust, joints thick-set, black, a rather 

 broad white or yellowish annulus about the middle; mesothorax flattened, 

 shining, coarsely punctured; scutellum flat, polished, white ; metathorax ru- 

 gulose, the central area large, quadrate ; tegulse brownish; wings subhyaline, 

 uniformly tinged with pale fuscous, stigma and nervures brown; legs black, 

 tips of anterior femora, the four anterior tibiae, except tips which are brown, 

 and a bi'oad annulus on posterior tibiae, white ; tarsi brownish: abdomen white, 

 second segment with a broad apical white band, and the two terminal segments 

 with a white spot on their apical middle; sometimes all the markings are yel- 

 low and the third segment has a narrow apical band or a central spot, and the 

 fiftli segment an apical spot, like those on the two following segments; in one 

 specimen the second and third segments are tinged with brownish. Length ii 

 — 5 lines. 



Hab. — Canada, Massachusetts. Four J specimens. 



