302 COLEOPTERA OF NORTH AMERICA. 



rounded behind, mesonotum covered with fine stridulatiiig sur- 

 face, with a few punctures each side near the edge. Elytra trun- 

 cate at tip, and armed with two apical spines as in most species 

 of Elaphidion. 



Front coxal cavities rounded, open, prosternum suddenly de- 

 clivous, and perpendicular behind ; middle coxae inclosed by the 

 sternal pieces, not angulated externally ; niesosternuni rather 

 broad, protuberant, suddenly declivous in front, truncate or 

 broadly eniarginate behind, side pieces moderately large, inter- 

 vening between the sterna, but not extending to the coxte. Me- 

 tasternum acutely emarginate behind for the reception of the 

 intercoxal process, episterna linear, ventral segments gradually 

 decreasing in length. 



Legs rather short, thighs not clavate, not spinose at tip; tibiae 

 strongly carinated, with the 1st joint as long as the two follow- 

 ing united. 



The closest affinities of this genus in the series with finely granu- 

 lated eyes are evidently with Cyllene, but there is an equally evi- 

 dent cross affinity in the direction of Elaphidion, Sphterion, etc. 



Batyle, associated with Stenosphenus by Lacordaire, has the 

 scutellum acutely pointed, the hind legs elongated, the antennal 

 tubercles more elevated, and the eyes more prominent. It seems 

 to us a degraded ally of Purpuricenus, and it has been placed 

 accordingly. 



Tribe XL— Cl.YTI]^I. 



A tribe containing many species, but on account of the varia- 

 tion in appearance and characters very difficult to define. The 

 head is sometimes rather small, sometiuies large, the front long, 

 quadrate, and vertical in some, short and oblique in others, eyes 

 finely granulated, deeply emarginate, with the lower lobe always 

 large ; antennae with the outer joints sericeous, usually shorter 

 than the body in both sexes, sometimes longer in the "S, joints 

 3-7 in some genera (Cyrtophorus) armed with an apical spine ; 

 palpi short, equal, dilated, but not very broadly, last joint im- 

 pressed; mandibles short, stout, acute; mentum nearly semicir- 

 cular, corneous. Front coxal cavities rounded, open behind, not 

 angulated externally; middle cavities usually open, sometimes 

 (Euderces, etc.) closed externally, side pieces large, articulating 

 with the metasternum, so as to interpose between tlie meso- and 



