504 TERTIARY INSECTS OF NORTH AMERICA. 



border slightly concave, the outer margin a little convex, the posterior 

 angles and posterior border exactly as in Oxytelus rugosus (Grav.) ; the 

 surface is delicately punctulate as in the species named, and there is a very 

 slight, shallow, and broad median longitudinal sulcation, whose walls, how- 

 ever, are not elevated into ridges, as usual in the species of Oxytelus. The 

 right elytron is expanded, and is therefore in the most favorable position for 

 examination; it is more than half as long again as broad, the humeral 

 angle well rounded off, the outer margin very gently convex, the apex 

 squarely truncate but slightly convex ; the surface is covered rather pro- 

 fusely and uniformly with shallow circular punctures resembling those of 

 the prothorax, and averaging about 0.04 mm in diameter. The abdomen is 

 much as usual in Oxytelus, the sides slightly convex, and the tip of the 

 abdomen bluntly and rather regularly rounded ; it was evidently furnished 

 rather abundantly with very fine, short hairs. 



Length of body, 4.2 mm ; of head, 0.78 mm ; breadth of same, 8 mm ; 

 length of eyes, 0.54 mm ; breadth of same, 0.1S mm ; length of prothorax, 

 0.72 mm ; breadth of same, 0.9 mm ; length of elytra, 1.22 mm ; breadth of same, 

 0.75 mm ;' breadth of abdomen, 1.16 mm . 



Chagrin Valley, White River, Colorado. W. Denton. 



BLEDIUS Leach. 



BLEDIUS ADAMUS. 



PI. 8, Fig. 10. 

 medius aflamus Scndtl., Bull. U. S. Geol. Geogr. Surv. Terr., IV, 762 (1878). 



A rather poorly preserved specimen shows the dorsal view of the body 

 without the legs or antenna'. It is of about the size of B. annularis LeC., 

 and resembles it in general appearance, but seems to have shorter teg- 

 mina, although these are obscure ; it is also a rather slenderer species. The 

 head is large, as broad as the thorax, with rather large eyes. The thorax 

 is quadrate, and the elytra together quadrate, and of the same size as the 

 thorax. The abdomen beyond the elytra is as long as the rest of the body; 

 apically it expands somewhat, and the extremity is shaped as in the species 

 mentioned. 



Length of body, 4.4 mm ; breadth of thorax, 0.75 mm . 



Green River, Wyoming. One specimen, No. 4081. 



