76 TERTIARY COLEOPTERA OF NORTH AMERICA. 



(i>iK'rir<n/HK. Elytra similarly punctate, with similar short hairs, the elytra 

 themselves as broad as the thorax or broader, and scarcely longer than it. 

 Abdomen narrower than the elytra, much longer than the rest of the body, 

 gradually tapering to a pointed tip, each joint fringed with long, distant 

 hairs and at outer margin with a very long tine seta, the surface besides 

 very sparsely pilose and apparently punctate like the thorax and elytra, in 

 which particulars it again agrees well with the American species. 



Length of body, 4.2:"> mm.; of antenna?, 0.8 mm.: breadth, O.7f> mm. 



Florissant, Colorado: one specimen, No. 2:"><!. 



PLATYSTETHUS ARCHETYPUS sp. nov. 

 PI. IX. tig. 2. 



This species, agreeing better in form and size with our living American 

 species than the preceding, does not so well resemble it in structure. The 

 whole body is black. The head is subtriangular, of about equal length and 

 breadth, with rather prominent large eyes, which give a somewhat angular 

 outline to the sides; the surface is very sparsely and rather obscurely pune- 

 tulate, each punctuation giving rise to a short hair. The anteniuv are so 

 imperfectly preserved that not much can be said of them, but they appar- 

 ently agree in every respect with the other fossil species: at least they are 

 longer than the head, have a slender basal and a not greatly enlarged apical 

 portion. Thorax rather longer and much broader than the head, much 

 broader than long, truncate at base and apex and with snbangnlate sides: 

 there is a tine median stria and a pair of distinct sinuate oblique carinse on 

 the disk, each running from one of the anterior angles to the middle of the 

 base, but fading at either extremity; the surface is otherwise precisely simi- 

 lar to that of the other fossil species. Elytra considerably broader than the 

 thorax, longer than the head and thorax together, scarcely longer than 

 broad, with the same surface structure as the thorax, but apparently with 

 longer haii-s. Abdomen rather shorter than the rest of the body, a little 

 narrower than the elvtra, scarcely broadening posteriorly for the lirst four 

 segments, behind that broadly rounded and scarcely produced, the surface 

 with scarcely perceptible, very sparse punctuation, but with hairs like those, 

 of the thorax, and no perceptible fringe or lateral seta' to the joints. 



Length, ,'$ mm.; breadth, I mm. 



Florissant, Colorado; one specimen. No. 



