ICHNEUMONID^. 105 



T. signatipes. — 9. Black; a spot on each side of face, clypens, and mandi- 

 bles, except tips, yellowish ; palpi pale, blackish at base : antennse about as long 

 as the body, black; scutellum prominent, convex; metathorax with sharply 

 defined carinse; tegnlse white; wings hyaline, iridescent, nervures and stigma 

 black, areolet oblique, petiolated; legs ferruginous, the two anterior pair paler, 

 posterior trochanters above, extreme tips of their femora, tips of their tibise 

 and their tarsi entirely, black, remainder of posterior tibise white, claws sim- 

 ple ; abdomen subpetiolated, ovate, depressed, shining, second segment dark ru- 

 fous, first segment with a central longitudinal channel, apex broadly dilated. 

 Length 2^ lines. 



i7a6.— Hudson's Bay Territory. (Coll. Mr. E. Norton,) One 9 specimen. 

 Allied to tibialis, but quite distinct. 



T. compressiventris. — 9- Black, shining; eyes prominent; spot or stain on 

 middle of face, sometimes indistinct or wanting, clypeus, most of mandibles, 

 and the palpi, lemon-yellow; antennae brown, paler beneath; a large, broad, 

 more or less hooked mark on each side of metathorax, tegulre, a spot before 

 and another beneath insertion of hind wings, lemon-yellow ; metathorax opa- 

 que, rugulose, without distinct elevated lines; wings hyaline, iridescent, ner- 

 vures brown, at base of wings whitish, stigma brown, areolet wanting; legs 

 long and slender, honey-yellow, the four anterior cox£e and trochanters lemon- 

 yellow, claws simple; abdomen sessile, very much compressed at tip, and pol- 

 ished ; basal segment quadrate, opaque, black, tip more or less reddish, second 

 to fifth segments honey-yellow, the remainder, sometimes including part of the 

 fourth or fifth segments, black; base of second segment sometimes black; apex 

 of abdomen truncate when viewed laterally, ovipositor short. Length 2i lines. 



"J, . — Colored like the 9 > except that the face entirely and anterior orbits are 

 yellow; the abdomen is depressed and not at all compressed at tip, the first seg- 

 ment is more elongate and the stigmatic tubercles, which are situated near the 

 base, are very prominent. Length 2i lines. 



Hub. — Mass., Conn. Six 9 > two'^ , specimens. The sessile abdomen, strongly 

 compressed at tip, in 9) will distinguish this species from any other of this ge- 

 nus known to me. 



T. submarginatus varies by having only the sides of the face, or a spot above 

 clypeus, white; by the scutellum having a Y-shaped white mark, or only its 

 sides and tips white; by the thorax beneath being sometimes entirely black, 

 by the posterior tibife being black, with a broad white annulus, and by the 

 whitish apical margin of the abdominal segments being sometimes distinct and 

 entire, sometimes more or less obsolete, and the venter white, spotted laterally 

 with black. The % has the abdomen narrow and almost cylindrical- Seven 

 specimens, from Great Slave Lake, British America, Maine, Massachusetts, 

 Connecticut and Illinois. 



T. Burgessi. — %■ Black, subopaque ; head transverse, face convex; all be- 

 neath antenna, anterior orbits, cheeks, scape beneath, collai-, a hook-shaped 

 line on each side of mesothorax, a large spot on the disk, furcate anteriorly, 

 apex and sides of scutellum, postseutellum, tegulse, spot before and another be- 

 neath, two spots behind posterior wing, tip of metathorax, pleura except large 

 mark beneath wings, four anterior coxee and trochanters, and apical margin of 

 abdominal segments, white; antennae longer than body, slen ler ; metathorax 

 smooth and rounded, a fulvous spot on each side behind ; wings hyaline, irides- 

 cent, nervures brown-black, areolet small, triangular, petiolated; legs long 

 and slender, especially posterior pair, posterior coxa, and all the femora except 



TRAXS. AMER. ENT. SOC. (14) JULY, 1868. 



