776 BULLETIN UNITED STATES GEOLOGICAL SURVEY, 



Bisonycha imnctigera Le C. 



Common ou various plants near Colorado Springs, August 12. 



Dlsonycha triangularis Say. 



ISot uncommon at Cauou City, August 11, and near Colorado Springs, 

 August 13. 



Graptodera plicipennis Mann. 



Local, but quite common on a tall golden-rod growing near the stream 

 in-Beaver Brook Gulch, August 6, and also in the western part of Den- 

 ver. 



Graptodera pmictipennis Le C. 



Found abundantly at Denver, at Colorado Springs, and near Caiion 

 City, August 8 to 13, on the willows, in wet situations. 



Odontota inwqiialis Web. 



Common in Clear Creek Canon and in the western suburbs of Denver, 

 August 6 to 9. 



Fam. TENEBRIONID.E. 



Epitragus eanalicidatus Saj'. 



Found only near the mouth of the Caiion of the Arkansas, upon a spe- 

 cies of slender, narrow-leaved UupJiorbia, which grew upon a spot of 

 ■white sand. The insects were thickly i^owdered. with a white, mealy 

 substance, which easily rubbed, off. They loved to crawl into the axils 

 of the flower-stems, and lay concealed there during the time of bright 

 sunshine, but early in the morning and toward evening twilight they 

 ran actively over the plants and pursued each other over the surface of 

 the ground. They showed wonderful dexterity in gliding beneath the 

 sand when I attempted to catch some of them, and they sometimes con- 

 cealed themselves quite successfully by burrowing into the sand at the 

 root of the plants. Keither the plant nor these insects were to be seen 

 in any of the other localities that I visited. 



Asida opaca Say. 



Not rare, but found wide apart, scattered over the plains and lower 

 hills, particularly in the vicinity of the Garden of the Gods. A few spe- 

 cimens occurred at Denver, August 18 ; others at Colorado Springs, and 

 later at Bijou. Each hill west of Colorado Springs seemed to afford a 

 variety peculiar to itself, but the whole series taken together exhibited 

 such minute gradations that there was no reason to regard the extremes 

 as distinct species. These variations are shown in the proportions of 

 the thorax and elytra of the specimens, in the amount and prominence 

 of their sculpture, and in the shape of their outline. Ko specimens oc- 

 curred in the valley of the Arkansas, nor near its caiion. 



Asida sordida Le C. 

 Met with onlv in the vicinitv of Denver, August 18. 



