HEMIPTERA— HETEROPTERA— PENTATOMlUiE, 443 



8. Procydnus mamillanus 



PL 7, Fig. 19. 



Cydima? maniUlanuf! SciicM., Bull. 11. S. Geol. Geogr. Surv. Terr., IV, 770 (1878). 



The body is broad and convex in front, with a rapidly tapering abdo- 

 men, scarcely at all rounded, even at the tip. The head, as seen from 

 above, is nearly circular, shaped much as in Stenopelta punctulata from the 

 same beds, but more broadly and regularly rounded in front, with the cen- 

 tral lobe broad, and defined by rather strongly impressed furrows ; the 

 ocelli are large, situated just behind the anterior extension of the thoracic 

 lobes ; the surface of the head is rugulose. Thorax more than twice as 

 broad as the head, and more than half as long again ; the sides rounded, 

 being broadest at the posterior border, narrowing in front and roundly 

 excised at the anterior angles ; front border very deeply hollowed behind 

 the head, leaving prominent front lobes on either side, nearly as large as 

 the head and strongly mamillate ; hind border nearly straight The sur- 

 face is minutely granulate, besides which there is a transverse belt of rather 

 large and distant punctures midway between the mamillations and the hind 

 border. The scutellum is very large, rounded-triangular, broader than 

 long, and granulate like the thorax. Corium of tegmina, which occupies 

 their greater portion, obscurely and distantly punctulate ; abdomen trian- 

 gular, the apex bluntly pointed. 



Length of body, 4"'"' ; of head, 8°"" ; of either lateral half of thorax, 

 1.35"""'; breadth of head, 1""°; of thora.x, 2.4°"°. 



Green River, Wyoming. One specimen. No. 39 (F. C. A Richardson). 

 Florissant, Colorado. Two specimens, Nos. 1925, 11760. 



3. NEGROCYDNUS gen. nov. {vexpo?, Cydnus, nom. gen.). 



The species of this have the same oval form as those of the preceding 

 genus, and differ from them in little but the relation between the head and 

 thorax, the latter very broadly and shallowly emarginate in front, and the 

 former consequently embraced by the thorax to a much smaller degree. 

 The head is rounded, always broader, generally much broader, than long, 

 the eyes and ocelli as in Procydnus ; it is, however, sunken to some extent 

 in the thorax, and its curves and those of the sides of the thorax are such 

 as hardly to destroy the effect of a single parabolic curve to the front end of 



