1864.] 173 



Closely resembles Irh. suturnlis Say, but is at once distinguished 

 from that species by the slightly transverse subquadrate central area 

 of the metathorax. I have before me numerous specimens of siitio-a/is 

 from Mass., N. Y., N. J., Penn., Del., Va., and Illinois, and all of them 

 have the central area large and elongate ; they vary in the black sutu- 

 ral bands of the abdomen being sometimes indistinct, and at other 

 times broad, especially that on the 4th segment. 



56. Ich. stibfuscus, n. sp. 



Reddish-brown: face, basal half of antennse, and scutellura tinged with yel- 

 lowish : apical half of antennce, sutures of thorax, and base of 2nd and 3rd ab- 

 dominal segments, blackish ; wings fusco-hyaline ; central area of metathorax 

 large, elongate. 



Femdle. — Reddish-brown ; the face and frontal orbits tinged with 

 yellowish ; antennae two-thirds the length of the body, slender, the 

 basal half pale rufous, the remainder black. Thorax finely and indis- 

 tinctly punctured, the mesothorax polished, the pleura indistinctly 

 aciculate ; all the sutures, except those in front of the wings, blackish ; 

 scutellum flat, polished, tinged with yellowish, the space on each side, 

 including the postscutellum, blackish ; metathorax densely and finely 

 punctured, the elevated lines well defined, the central area large and 

 elongate. Wings long, fusco-hyaline ; nervures fuscous, testaceous at 

 base, stigma fulvous ; areolet 5-angular. Legs rufo-fuscous, the poste- 

 rior tibiai at tip blackish. Abdomen rather short, robust, shining, 

 very minutely punctured ; first segment rather broad, bilineated and 

 finely aciculate, petiole moderate, blackish at base ; basal foveae of the 

 2nd segment small, slightly impressed, coarsely aciculate and blackish ; 

 base of the 3rd and 4th segments above with a blackish band not reach- 

 ing the lateral margins, that on the 4th segment occupies almost the 

 basal half and is twice as broad as that on the 3rd segment ; apical 

 segments polished ; beneath same color as above, the apical margins of 

 the segments with a darker stain ; ovipositor subexserted. Length 6 

 lines; expanse of wings ll^ lines. 



Hal). — Rocky Mountains, Colorado Territory. 



This species is allied to Ich. suturah's Say and Ich. propinquus n. sp. ; 

 from the former it differs by the darker color, the longer antennae and 

 wings, and the more robust form ; from propinquus it differs by the 

 darker color, the longer antennae and in the shape of the central area 

 of the metathorax. 



