282 COLEOPTERA OF NORTH AMERICA. 



sculpture is also different, there being indications, more or less 

 distinct, of two ivory vittaB on each elytron. 



Curious sexual differences appear on the under surfaces of the 

 prothorax in Phyniatodes and Callidium ; the punctures are 

 coarser and more numerous in % . 



Xylocrius Lee. is founded upon CaUidium Agassizii Lee. 

 (Proc. Acad. Nat. Sci., 1861, 357), a black coarsely punctured 

 species, from California; it is of more convex form than usual in 

 this gfoup, the antenna3 are shorter and stouter with joints 3-6 

 equal, the palpi unequal, the presternum naiTow and pointed 

 behind, the mesosternum subtriangular, obtusely truncated and 

 slightly emarginate at tip, the hind cox£e not inclosed by the 

 side pieces of metasternum. The scutellum is triangular with 

 curved sides, and the mesonotum, though provided with a medial 

 stridulating surface, is punctured and pubescent at the sides. The 

 hind tarsi are stouter than in the other genera of this group, and 

 the thighs are moderately clubbed. 



Tribe III.— CERAMBYCIIVI. 



A very extensive series, of rather difficult definition, and con- 

 taining a large number of genera, which seem to have been 

 unnecessarily multiplied, on account of the unimportance of the 

 characters used for the definition of the separate groups. As 

 here restricted, the tribe contains all of the groups of Section A. 

 (Lac. Gen. Col. viii. p. 202), which are represented in our fauna, 

 except Asemini and Obriini; in other words, all genera having 

 the eyes strongly granulated, the front' coxal cavities usually open, 

 the abdomen normal in both sexes, and the antennae with the 2d 

 joint small. 



The ligulais sometimes (Oeme, etc.) corneous, but usually meni- 

 In-anous, and deeply bilobed ; the scutellum is usually rounded, 

 rarely (Chion) triangular and acute ; the stridulating surface is 

 fine, and covers nearly the whole mesonotum; the antennae are 

 nearly always long, and without distinct sensitive spaces. The 

 mandibles are acute at tip. The middle coxal cavities are some- 

 times open, sometimes closed, varying frequently, to an appre- 

 ciable extent, in the species of the same genus. The elytra, as 

 observed by Lacordaire, are not abbreviated, but they are slightly 

 so in Gracilia manca; the eyes are not divided in any of our 



