1864.] 291 



joint robust and polls'hed. the 3rd and 4th joints about equal in length, 

 the 5th a little shorter. Thorax above polished, minutely punctured, 

 the dorsal lines very deep and large, beneath the wings very densely 

 punctured, a polished spot beneath the posterior wings, as well as the 

 space between the anterior and middle coxoe ; scutellum polished ; meta- 

 thorax somewhat rugose, opaque, truncate behind, the carina bordering 

 the truncation sharply defined, the lateral tubercles prominent and 

 subacute. Wings uniformly tinged with fuliginous, and having a blu- 

 ish gloss ; nervures and stigma black ; areolet 5-angular, the lower ner- 

 vure bro:idly angular. Legs black, polished, all the femora, and the 

 anterior tibia) and tarsi, rufous. Abdomen short and robust, subovate, 

 shining ; the basal segment flattened, strongly arcuated, broad at tip, 

 the peduncle short and polished ; ovipositor rather longer than the 

 first segment, rufous, valves black. Length 5 lines ; expanse of wings 

 81 lines. 



Hah. — Rocky Mountains, Colorado Territory. 



Shorter and stouter than C proximus, and without any central area 

 on the metathorax. 



4. Cryptus nubilipennis. n. sp. 



Black: antenn£e with a wliite annulus: wings with a fuliginous band across 

 their apical third ; legs mostly rufous: ovipositor longer than the body. 



Female. — Black ; face short and broad, finely punctured ; the orbits 

 behind subobsoletely rufous ; the front not depressed behind the an- 

 tennae; clypeus small, transverse, polishod, with a deep puncture on 

 each side; mandibles small, polished, which, as well as the clypeus, is 

 tinged with piceous ; antennae more than half the length of the body, 

 subporrect, rather slender, black, the 8th to 11th joints more or less 

 white, basal joint robust, the 3rd and 4th joints subequal, the 5th and 

 6th shorter, subequal. Thorax densely and very finely punctured, shin- 

 ing, the dorsal lines not deep; scutellum slightly convex, densely punc- 

 tured ; metathorax finely scabrous, somewhat rounded behind, the ele- 

 vated lines indistinctly defined, and forming a large, nearly obsolete, 

 rhomboidal central area, the lateral tubercles small. Wings smoky- 

 hyaline, the extreme tips and a broad band on the apical third, not 

 quite reaching the posterior margin of the wing, fuliginous ; nervures 

 and stigma black ; areolet 5-angular. Legs rather slender, rufous ; the 

 coxae and trochanters black ; the four anterior femora at base, apex of 



