56 TERTIARY COLEOPTERA OF NORTH AMERICA. 



the thorax and legs are much Ug-hter and apparently were of a testaceous 

 color. 



It appears to be somewhat nearly allied to the modern P. ceneus Rossi, 

 which it nearly approaches in size and with which it agrees tolerably well 

 in the relation of the second and third antennal joints to the succeeding, but 

 the posterior angles of the head are less prominent, and like the other species 

 here described, it difiPers markedly in the brevity of the antennae. It is 

 perhaps more closely allied to P. tachimformis Say, figured by Sharp in 

 the Biologia centrali-americana, but differs in the same points. In the 

 shape of the head it is more like P. godmani Sharj^ from Mexico, but it has 

 not so long a prothorax. 



Length, 9.5 mm.; breadth, 1.75 mm.; length of antennae, 2.25 mm. 



Florissant, Colorado; one specimen. No. 616. 



Philonthus horni sp. nov. 



PI. VII, figs. 1, ± 



Head subquadrate, slightly narrower than the prothorax, but broadest 

 at base and tapering forwai-d, a little broader than long, smooth. Antennae 

 scarcely reaching to the middle of the prothorax, moderately slender, 

 increasing but very little and very gradually in size, the first joint obovate, 

 largest just beyond the middle and about three times as long as broad, the 

 second joint much slenderer and about half as long, the third slender and 

 not greatly shorter than the first, the fourth quadrate, and the remainder 

 increasingly broader than long, excepting the last, which is ovate. Pro- 

 thorax broader than the head and nearly half as broad again as long, as 

 broad anteriorl}^ as posteriorly, with rather strongly and regularly convex 

 sides, the surface smooth, with scattered short and very fine hairs. Elytra 

 a little broader and considerably longer than (half as long again as) the 

 prothorax, villous, with rather short hairs. Legs apparently much as in the 

 other Florissant species, but only imperfectly preserved. Abdomen sub- 

 fusiform, largest at the third segment, tapering apically to a not very blunt 

 point, the surface covered with hairs exactly like the elytra, with straight 

 lateral diverging bristles on the last two segments. Lateral terminal 

 appendages nearly as long as the last segment, straight, scarcely tapering, 

 bluntly rounded at tip and covered with bristles ; median anal appendage 



