396 BULLETIN UNITED STATES GEOLOGICAL SUEVEY. 



der; buccul?e dull black, mimitely scabrous, and densely, minutely 

 punctate. Autennte piceous, i^ale on the edge of the incisures ; the 

 second joint longer and more slender than the third; the basal one 

 shorter and stouter than either. Under surface of the head a little con- 

 vexly prominent, roughly punctate. Pronotum highly polished, closely, a 

 little coarsely punctate, but with a large impunctate callosity each side 

 of the anterior lobe ; sides obliquely widening anteriorly, produced an- 

 teriorly into rounded lobes, which extend almost to the front of the 

 eyes; transverse line broad, the center broadly sunken; posterior mar- 

 gin very faintly curved, the humeri distinct, and the sinus narrow, lon- 

 gitudinal. Pleural pieces and sternum uneven, dull, rugose, and coarsely, 

 irregularly punctate. The coxoe and tumid areas of the epimera pol- 

 ished and rufo-piceous. Legs rufo-piceous, the spines black, and the 

 tarsi ferruginous. Scutellum coarsely, closely punctate, a little convex 

 at base, and a little depressed beyond the base ; the basal angles each 

 with around, bald, polished spot. Oorium tinged with rufous, densely 

 and coarsely punctate at base and on the sutures, but more finely and 

 obsoletely so posteriorly; the costal edge thin, closely and copiously 

 punctate ; the embolinm long, smooth, longitudinally, broadly channeled ; 

 costal area narrow, at base quite slender and elevated ; posterior margin 

 bluntly oblique, faintly waved, the outer angle a little prominent ; mem- 

 brane white, scarcely reaching the tip of the abdomen. Venter deep 

 black, polished, almost smooth, and obsoletely punctate on the disk and 

 middle line, closely and roughly punctate on the sides; sides of the pos- 

 terior edges of the segments minutely rough; the connexivum depressed , 

 the edge broadly compressed and very thin. 



Length 5 millimeters. Width of base of pronotum 2 millimeters. 



Collected in McLennan County, Texas, by G. W. Belfrage. 



This is the most singular and aberrant of all the forms of our Cyd- 

 nidce yet discovered. Its head resembles that of Eurygaster and others of 

 the less thick forms of the PacJiycoridce, while the slender form of its 

 scutellum, hemelytra, and body suggest analogies with some of the black 

 species of several genera of the Ehyparochromid Lygceidw. Thus far 

 only two specimens, both females, have been secured. 



Tribe 2.— SEHIRINI. 



Femora, exclusive of the anterior pair, terete, subfusiform ; tibiae with 

 fewer and shorter spines, the anterior pair not flattened ; tarsi stouter, 

 the second joint more slender than the basal one. 



Sehirus Amyot et Serv. 



Ovate, flattened above. Head long-semicircular, the lateral lobes 

 thin, oval, broadly upcurved, a little longer than the tylus, not meeting 

 in front of it, but leaving a narrow emargination between their tips ; 

 the edge very narrowly recurved ; the submargins neither ciliated nor 

 spinous, Tylus gradually narrowing near the tip. Autennfe rather 



