42 CONTUIBUTIOXS TO CANADIAN PALiEONTOLOGY. 



but SO few really generic features remain that one can judge by little 

 other than accessory characters. The head is wanting and the thorax is 

 broken, and tliough exliilnting the under surface, the markings of the 

 elytra can be readily seen, as is frequently the case in fossil beetles. The 

 form of the elytra and scutellum is precisely that of Prometohia sexmacu- 

 lata, excepting that the base of the elytra is more distinctly angulate ; 

 beneath, the elytra are expanded just as there, and punctured in much 

 the same irregular and minute manner, but equally so at the extreme 

 border beneath, instead of being furnished at this point with transverse 

 ruga3 ; the punctures are 0"028'""' in diameter, and do not give origin to 

 hairs ; the elytra are dark castaneous, and have a dull ridge along the 

 sutural margin. The thorax is black, and proportionally shorter than in 

 Prometopia, but otherwise it appears to have the same form, although the 

 characteristic lateral projections of the front border are broken off, only 

 the slightest indication of that on the left side appearing in a portion of 

 the curve of the front bordei\ The thorax is more minutely punctate 

 than the elytra, and the puncta are connected by the slightest possible 

 impressed lines, giving it somewhat of a corrugated appearance ; a few of 

 the abdominal segments may be seen, the pygidium extending just beyond 

 the elytra ; all these joints are black, smooth, and shining, without trace 

 of hairs or punctures. 



Length of fragment, 5'5""" ; length of middle of thorax, 1-25"""; 

 breadth of same, 3 •2""" ; length of elytra, 3-75""" ; breadth of united 

 elytra, 3-35""". 



Quesnel, British Columbia. One specimen. No. 24 — Dr. G. M. Dawson. 



Family STAPHYLINID^. 

 Arpedium Erichson. 

 Arpedium stiliicidii. 



PL II, fig. 2. 



Allied to A. cribratum Fauv., but less sharply punctured. A single 

 elytron, broken at the humeral angle. It is about twice as broad as 

 long, the sides parallel and delicately margined ; the posterior border is 

 straight, the outer posterior angle much rounded. Most of the deflexed 

 portion of the outer margin is broken off, but to judge from what is left it 

 was probably of considerable breadth, and it certainly extended considerably 

 beyond the middle of the outer half of the elytron. The surface of the 

 elytron is leather coarsely and profusely punctate at the base, the puncta 

 becoming shallower, rather larger, and more distant apically and nearly 

 fading out at the tip. The texture is tolerably firm and the colour blackish 



