HEMIPTERA— BETEROPTEltA— PENTATOMID.^. 445 



triang-ular, with straiglit sides, the apex scarcely reaching more than quarter 

 way to the tip of the abdomen. Hemelytra witli. the corium reaching to 

 the middle of the apical half of the abdomen, only the costal edge, but that 

 broadly, coriaceous, the remainder semidiaphanous and faintly infumate 

 like the membrane. 



Length, 4,5""" ; breadth, 2.25°"". 



Florissant. One specimen, No. 7399. 



2. Necrocydnus gosiutensis. 



PI. 7, Fig. 22. 



Head broad, rounded, nearly twice as broad as long and with the rather 

 large and prominent eyes fully half as broad as the thorax. Thorax more than 

 three times as broad as the median length, subquadrangular, the sides taper- 

 ing only a little, the anterior lateral angles well rounded, the breadth near 

 the front (next the bottom of the apical emargination) seven-eighths that of 

 tlie basal margin, the apical emargination broad and shallow, rather more 

 than half as broad as the base of the thorax, and hardly a tenth as deep as 

 broad, very regular ; surfece even, but for a rapid slope close to the sides, 

 and apparently smooth. Scutellum very large from its breadth, much shorter 

 than broad, reaching nearly half-way to the tip of the abdomen. Corium 

 of hemelytra reaching the last abdominal segment, rather coarsely and 

 very sparsel}' granulate. 



Length, 4.60'""' ; Ijreadth, 2.5"™. 



Green River, Wyoming. One specimen. No. 13, Leslie A. Lee. 



This is the only species of Necrocydnus yet found within the limits of 

 the ancient Closiute Lake. 



3. Necrocydnus torpens. 



Head large, well rounded, nearly twice as broad as long, and nearly 

 two-tiftlis as Ijroad as base of thorax ; the antennas about as lonsr as the 

 tlu)rax. Thorax only twice as broad as the median length, tapering con- 

 siderably, the lateral angles of the front not prominent, the emargination of 

 tiie apical border half as long as the basal border, regular, and moderately 

 deep ; surface very finely punctate, even. Scutellum large, broader tlian 

 long, the apex not extending half-way to the tip of the abdomen. Heme- 

 lytra with the corium serially [)unctate, reaching the penidtiniate abdominal 



