40 TERTIARY COLEOPTERA OF NORTH AMERICA. 



martrinate. the surface with the same sculpturing as the prothorax, and 

 lioides verv faintly and very narrowly striate with longitudinal punctures, 

 or more properly stria-. These are about as distinct as in T. xtriolatitx Le( '.. 

 lint are wholly different on account of their extreme slenderness and the 

 longitudinal character of their components. 



Length of body as preserved, 9. '25 mm.: length to tip of elytra, s.l nun.: 

 breadth, 4mm.: length of elytra, 4.6mm. 



Florissant, Colorado: one specimen, No. 9210. 



TROPISTERNUS LIMITATUS sp. nov. 

 ]'l. V. tiu-. -1. 



Although this species is placed in this genus, it is only temporarily, 

 until better aud more abundant material shall give the opportunity of 

 properly characterizing the genus to which it really should be referred, 

 which, so far as we know, is extinct. It belongs without doubt to the 

 Hydro philini, as its wide prothorax and compressed tarsi show, but as the 

 genera of Hydrophilidse are tolerably constant in size and this is very 

 mucli smaller than any Hydrophilini known, it can hardly be doubted that 

 it will prove a distinct generic type ; moreover the structure of the hind 

 tarsi is very different from what we find in the other genera; for though 

 stronirlv compressed, they are subequal, somewhat ovate, and two or three 

 times as long as broad. The whole insect is of a very regularly elongate 

 oval shape, of a uniform carbonaceous color, showing no sculpture what- 

 ever beyond a pair of straight raised lines, converging posteriorly, which 

 cross the prothorax and thus limit a wedge-shaped median piece, the trout 

 niar-in of which is rather more than one-third of the front border ot the 







prothorax, while the hind margin is about one-third its anterior width. It 

 is probable, however, that these raised lines are indications of some sculp- 

 tural characteristics of the under surface, as they are not <mite symmetrical 

 and do not appear on both specimens referred to this species. The eyes 

 are larg-e, subglobose, extend slightly beyond the curve of the head, and, 

 a- \ie\ved from abo\e, are longer than broad. The sutnral edge ot the 

 elytra is very delicately margined. 



Length, .0 mm.; breadth, 2.IJ mm. 



Florissant, Colorado ; two specimens. Nos. _".).'><;. .'SIT!*. 



