454 BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



2. C. interrupta. 



Corixa interrupta Say, Journ. Acad. Phila., iv, 328, No. 1. 

 A few examples were taken ia Sloan's Lake, on the highlands west of 

 Denver, in July by Dr. Packard, and in August by myself. 



3. G. tumida, new sp. 



Pale fuscous, elongated, the whitish lines generally broader than the 

 brown spaces ; the surface very obsoletely rastrated on the prouotum, 

 and not rastrated, but faintly uneven, on the clavus and corium. Head 

 longer than wide, white, the vertex tumid, subconically rounded in front, 

 with a blunt ridge along the middle line, which terminates in a carina an- 

 teriorly, and in an angular production of the occiput posteriorly ; each side 

 of this ridge is a line of coarse punctures, connecting anteriorly with some 

 finer ones ; next the inner margin of the eyes the surface is linearly im- 

 pressed and finely punctate; the occipital margin carinately elevated, and 

 having the angle next the eye depressed and punctate; front long,ovately 

 excavated in its whole length, and in its width below the first third ; a 

 large elliptical fossa next the lower angle of each eye invaded by a group 

 of coarse punctures. Pronotum of medium length, somewhat obliquely 

 arcuated behind, pale yellowish, highly polished, with nine very slender, 

 brown, complete lines, and about three shorter ones (sometimes with 

 fewer full lines and more sharp ones); the first line interrupted ia the 

 middle; clavus margined with brown basally on the outer margin, and 

 with a slender brown line on the inner subinargin; the surface yellow- 

 ish-white, with a few straight, very short, brown, slender lines at base, 

 some connected with the inner margin and others with the outer mar- 

 gin ; the brown lines behind the base slender, wavy, arranged in two 

 series, each starting from the opposite margins, and along the middle 

 coalescing in part, and forming a longitudinal, wavy line; corium 

 highly polished, yellowish-white, the brown lines slender, wavy, form- 

 ing generally about three transverse series, and coalescing posteriorly 

 to form two longitudinal lines ; the costal edge brown, with the epi- 

 plenra whitish, and having the transverse nervure and a spot before the 

 apex fuscous; membrane with vermiculate brown line behind the mid- 

 dle, more or less coalescing posteriorly. Legs yellowish- white, the pos- 

 terior ones long, with the hindmost tarsi and tip of tibite piceous; palse 

 of the male very short, tinged with tawny, depressed near the tip, 

 shaped like a shovel, with a round base, very obliquely truncated, leav- 

 ing the tip quite acute, the inner margin with a few moderately long 

 bristles ; fore tibiae compressed, a little incurved, longer than wide, the 

 outer margins a little arcuated, the posterior submargin with an im- 

 pressed line, and the anterior margin cariuated. Tergum blackish, with 

 the couuexivum yellowish ; venter blackish, with the surface very mi- 

 nutely, whitish pubescent; the posterior margins of the segments and 

 the connexivum yellowish. 



Length to tip of hemelytra 6-6i millimeters. Width of base of prono- 

 tum 1^-2 millimeters. 



