CERAMBYCIDAE. 301 



A. Elytra without ivoiy vittse ; 

 Protliorax with an acute lateral spine ; 



Eyes not divided (pubescence line). Oxoplus. 



Eyes divided (pubescence coarse). Sohizas. 



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



Protliorax rounded on the sides, or feeble spinose, witliout dor.sal callosi- 

 ties (pubescence long and partly erect). Crossidius. 



Prothorax narrowed in front, raesosternuin convex. Sphaeuothecus. 



B. Each elytron with two ivory vittse ; prothorax narrowed in trout : 

 Mesosternum declivous, body robust. Perarthrus. 

 Mesosternum protuberant, body slender. Ischnocnemis. 



Scliizax is established on a remarkable insect, S. 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 antenuK are slender, 

 and very long in the % . 



To Crossidius belongs Callidium discoideum Say, which is 

 identical with Cr. ])ulchrior Bland. The reference of Say's spe- 

 cies to p]riphus (now Batyle) was incorrect, and was owing to 

 the insect not having been properly identified. 



To Spheenothecus should be referred S. siitui^alis IjCC., from 

 New Mexico, while the Mexican and Texan S. biviltatus Dupont, 

 having distinct ivory vittce, seems to belong more properly to 

 Ischnocnemis Thonn^on. 



Tribe X.— STEIVOSPHEIVIIVI. 



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

 tures are sparse and coarse, the pubescence scanty, and the general 

 form more slender. ThC; head is small, narrow and porrected in 

 two of the species, with the front elongated, and very slightly de- 

 clivous; but shorter, and nearly vertical in Ste)wsphenus notalu.^. 

 The eyes are finely granulated, deeply emarginated; the antennal 

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

 somewhat longer in %, setaceous, jjuncturcd and pubescent, nut 

 sericeous, sparsely clothed beneath w^th 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 



