g NATURAL HISTORY BULLETIN 



part, angles distinct, sculpture similar to that of the head but a little less 

 pronounced. Elytra broadest about the middle, very finely punctate over 

 the whole surface and showing signs of striae which appear to have been 

 indistinctly punctured. Legs moderately slender, the tibiae with markings 

 indicating rows of spines as in H. fuscipes. Abdominal segments subequal 

 in length, finely punctate. Length, 10.00 mm.; of elytra, 5.75 mm. 



At first sight, I had supposed this insect would turn out to be 

 a Tropisfernus, but an examination of the sterna and feet indi- 

 cate its position as a member of the tribe Hydrohiini, where it 

 seems to go well with Hydrohius, a genus showing considerable 

 diversity in form and size. The tarsi are not flattened nor dis- 

 tinctly ciliate, and the metasternum is not prolonged into a spine. 

 As far as they can be made out, the plates of the under surface 

 of the body are strikingly like those of H. fuscipes. The only 

 Florissant species with which it can be compared' in facies is 

 Tropisternus van us, which differs not only in being smaller, but 

 by the elytra being two and a half times the length of the median 

 prothoracic line, while in H. titan they are about three and a 

 half times the length. The specific name refers to the exceptional 

 size of the fossil species. 



H. PRiscoNATATOR Wlclli. (Plate II, Figs. 1, 2, 3.) The original de- 

 scription of this species was unaccompanied by a figure. I take the present 

 opportunity to offer sketches showing both under and upper surfaces, the 

 drawings being made from the type. A renewed study of the specimen 

 shows that the elytral striae are indistinctly punctate. 



Creniphilites n. gen. 



Form similar to that of the modern species of Creniphilus, but perhaps a 

 little more oblong. Metasternum considerably more elongate. Antennae 

 not in very good condition, but the basal club-joint is larger and the ter- 

 minal pne smaller than in the recent members of that genus. The type is 

 C. orpheus, described below. 



C. ORPHEUS n. sp. (Plate IV, Figs. 1, 2, 3.) Form elongate oval. Head 

 rather small, outline subcontinuous with the curve of the prothoracic sides, 

 eye moderate. Antenna? with basal joints not defined, club four- jointed, the 

 first and last of these smaller than the intermediate ones. Prothorax much 

 broader posteriorly, width equal to about twice the length, widest across the 

 base, sides feebly arcuate, sculpture not visible. Elytra subcontinuous in 

 outline with the prothorax (in the dorsal view, which is the better pre- 

 served), broadest at about their middle, sculpture apparently a fine, aluta- 

 ceous roughening, no visible punctuation nor striation. Legs short and 

 small. Front coxa^ rounded, contiguous, middle coxte oblique and nearly or 



