438 TERTIARY INSECTS OF NORTH AMERICA. 



A single species is known, from Green River, formerly referred to 



JEthus. 



STENOPELTA PUNCTULATA. 



PI. 7, Figs. 12, 13. 



&thus punctulattis Scudd., Bull. U. S. Geol. Geogr. Surv. Terr., IV, 769-770 (1878). 



I repeat here the original description, although it contains many 

 generic details : 



Body of nearly equal breadth throughout, the sides of the abdomen a 

 little fuller. Head rounded, small, the part behind the eyes rounded, as 

 deep as the portion in front of them ; front as seen from above, well 

 rounded, well advanced, subangulate ; eyes moderately large ; ocelli large, 

 situated close to, a little behind, and within the eyes, and about one-third 

 their diameter ; surface of head minutely and obscurely granulate. Thorax 

 nearly equal, slightly broadening posteriorly, the anterior angles well 

 rounded, the front border very deeply and roundly excised, the hind border 

 nearly straight ; the whole fully twice as broad as the head and twice as 

 broad as long. Scutellum obscure, but apparently of about equal length 

 and breadth, and regularly triangular. Abdomen well rounded, half as 

 long again as broad. Tegmina obscure or lost in all the specimens seen. 

 Thorax and scutellum minutely granulate, like the head. Posterior half, at 

 least, of the abdomen profusely covered with shallow punctures. 



Length of body, 3.75 mm ; of head, 0.6 ram ; of middle of thorax, 0.75 mm ; 

 breadth of head, 0.8 min ; of thorax, 1.7 mm ; of abdomen, 1.85 mm . 



Green River, Wyoming. Five specimens, Nos. 19' 1 , 67, 74 a , 172 (F. 

 C. A. Richardson), 4193 (S. H. Scudder). 



2. PROCYDNUS gen. nov. (n-p6, Cydnus, nom. gen.). 



Body less than twice as long as broad, ovate, with extremities more or 

 less tapering, especially in front, by the more rapid narrowing of the thorax, 

 the head sometimes completely sunken in the thorax, at other times half 

 projecting beyond the anterior curve of the body ; it is always broader 

 than long, though sometimes nearly circular ; the eyes are moderately 

 large, not very prominent, subcentral, the ocelli large and situated well 

 behind the produced anterior curve of the thorax in the deep emargination 

 for the reception of the head. Thorax subtrapezoidal, more than twice, 

 sometimes thrice, its middle length, truncate at base, the sides more or less 



