494 , Coleopterological Notices, V. 



tubercles convex, broad ; surface behind them abruptly deeply and trans- 

 versely excavated from side to side, the excavation trisected by two feeble 

 carinae at the bottom, its posterior margin acute and feebly bilobed ; in the 

 middle on ihe upper surface immelintely behind each lobe there is a large 

 fovea, the two approximate and each bearing a tuft of long erect setae ; occiput 

 and vertex without other impressions, even, very strongly convex, arched and 

 elevated above the eyes, the latter prominent and convex, near the base; 

 tempora with a dense tuft of coarse setse ; under surface strongly but broadly 

 convex behind the oral opening ; antennae not quite one-half as long as the 

 body, the first joint a little longer and thicker, two to eight subquadrate, nine 

 and ten but little larger, nearly as long as wide, eleventh large, thick, oval, 

 obtusely pointed. Prothorax nearly as long as wide, hexagonal, widest a little 

 before the middle ; apex three-fourths as wide as the base. Eljtra nearly as 

 long as wide, three-fourths longer than the prothorax and nearly twice as 

 wide ; sides feebly arcuate behind ; humeri strong, broadly exposed at base; 

 discal stria extending to the middle. Abdomen a little narrower than the 

 elytra but nearly as long ; border as in Cylindrarctus ; carinae of the first and 

 second dorsals subparallel, separated by a little less than one-third the discal 

 width, the first two-thirds, the second one-fourth as long as the respective 

 segment. Metasternum large but not tumid, perfectly even throughout. 

 Length 1.8 mm. ; width 0.7 mm. 



California (Siskiyou Co.). 



The male sexual modifications of the under surface are very 

 feeble, consistino^ only of a small and very feeble impression of the 

 sixth ventral, with a narrow feeble sinuation of its apex, the sinua- 

 tion receiving the very minute transversely oval py^idium on the 

 same plane. In the female the subfrontal excavation is doubtless 

 wanting, but it would be interesting to note the position of the 

 vertexal fovese, as these seem to be peculiarly modified and con- 

 nected in some way with the excavation in the male, if, indeed, 

 the two foveae mentioned above are really the two ordinary ceph- 

 alic foveas of the family. 



PSELAPHINT. 



PSELAPHUS Herbst. 



In this singular genus there are two characters Avhich, though 

 probably not peculiar to it, are nevertheless strikingly developed. 

 The first relates to the position of the two large spongiose foveae of 

 the head, which, in most genera possessing them, are situated on a 

 couiparatively flat surface and are distinct from a vertical point of 

 view. In the present genus the upper surface becomes abruptly 

 declivous far behind the middle, the declivous wall being almost 



