316 COLEOPTERA OF NORTH AMERICA. 



Prothorax rounded on the sides, with dorsal callosities. TYLOSIS. 



Prothorax rounded on the sides, or feeble spinose, without dorsal callosi- 

 ties (pubescence long and partly erect). CKOSSIDIUS. 



Prothorax narrowed in front, mesosternum protuberant. SPH/ENOTIIECUS. 

 B. Each elytron with two ivory vittae ; prothorax narrowed in front ; 



Mesosteruum declivous, body robust. PERARTHRUS. 



Mesosternum protuberant, body slender. ISCHNOCHEMIS 



Schizax is established on a remarkable insect, >. senex Lee., 

 from Arizona ; the color is black, the pubescence is coarse, dirty 

 white, with the scutellum, suture and side margin of elytra 

 densely clothed with yellow pubescence ; the elytra rounded at 

 tip, with the suture slightly prominent ; the antennae are slender, 

 and very long in the $ . 



To Crossidius belongs Callidium discoideum Say, which is 

 identical with Cr. pulchrior Bland. The reference of Say's spe- 

 cies to Eriphus (now Batyle) was incorrect, and was owing to 

 my not having properly identified the insect. 



To Sphsenothecus I would refer S. suturalis Lee., from New 

 Mexico, while the Mexican and Texan S. bivittatus Dupont, 

 having distinct ivory vittae seems to belong more properly to 

 Ischnocnemis Thomson. 



Tribe X. STEXOSPIIEMNI. 



Closely allied to the Cyllene group of Clytini, but the punc- 

 tures are sparse and coarse, the pubescence scanty, and the gene- 

 ral form more slender. The head is small, narrow and porrected 

 in two of the species, with the front elongated, and very slightly 

 declivous ; but shorter and nearly vertical in Stenosphenus nolatus. 

 The eyes are finely granulated, deeply emarginated; the antennal 

 tubercles are not elevated ; antennae as long as the body in 9 , 

 somewhat longer in , setaceous, punctured and pubescent, not 

 sericeous, sparsely clothed beneath with flying hairs ; 2d joint 

 small, 3d longer than 4th, 3-7 armed with an apical spine on the 

 inner side, as in Elaphidion. Palpi short, subequal, last joint 

 nearly cylindrical, truncate at tip, not impressed. Prothorax 

 rounded on the sides, without spines or callosities. Scutellum 

 rounded behind, mesonotum covered with fine stridulating sur- 

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

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

 species of Elaphidion. 



Front coxal cavities rounded, open, prosternum suddenly de- 



