292 [September 



the posterior tibi?e and all the tarsi, brownish. Abdomen rather short, 

 robust, subovate ; basal segment strongly arcuated, rather longer than 

 the second, flattened, broad at tip and somewhat bilineated; ovipositor 

 longer than the abdomen, rufous, valves black. Length 42 lines; ex- 

 panse of wings 8 lines. 



Huh. — Rocky Mountains, Colorado Territory. 



Allied to C. luctuosus but is easily distinguished from that species by 

 the band on the wino;s. 



o 



5. Cryptus crassicornis. n. sp. 



Black: antennpe much thickened, opaque: frontal orbits white; legs rufous, 

 the tarsi yellowish : wings subhyaline : abdomen slender. 



Male. — Deep black, slightly pubescent ; face rather long, eyes promi- 

 nent; the orbits, more or less interrupted on each side near the vertex 

 and beneath the eyes, sometimes ending in a spot on each side of the 

 clypeus, narrowly whitish ; clypcus small, prominent, polished ; man- 

 dibles projecting; basal joint of palpi yellowish; the front behind the 

 antennae deeply excavated ; antennai nearly as long as the body, opaque 

 black, much thickened at base, and gradually attenuated towards the 

 tip, which is very slender, basal joint robust, subglobular, clothed with 

 black pubescence, 3rd joint about Hh longer than the 4th, the 5th and 

 6th joints each as long as the 4th, remaining joints gradually diminish 

 in length, the incisures indistinct. Thorax above shining, not densely 

 punctured, the doi'sal lines not deeply impressed, on the pleura the 

 punctures are very dense ; beneath the posterior wings a smooth, pol- 

 ished spot, as well as the surface between the anterior and middle coxae; 

 scutellum subconvex, shining, rather densely punctured ; metathorax 

 opaque, scabrous, pubescent, the elevated lines and lateral tubercles 

 not well defined, in some specimens there is a fiiint indication of a sub- 

 quadrate central area. Wings subhyaline, faintly tinged with fuligi- 

 nous, and having a slight bluish gloss ; nervures and stigma black ; 

 areolet 5-angular or somewhat 4-angular, the cubifcil nervvxre with a 

 process within the first submarginal cell. Legs long and I'ather slender, 

 rufous ; four anterior tibiae in front and the tarsi toward the tips more 

 or less tinged with yellowish, the posterior tibiae and tarsi sometimes 

 brownish ; all the coxae and the trochanters, black. Abdomen elon- 

 gate, slender, shining ; the basal segment as long as the 2nd, polished, 

 the apical third subquadrate, not much dilated, the lateral tubercles 



