CERAMBYCIDAE. 319 



Antennae compressed, subserrate. GLYCOBIUS. 

 Antennae filiform ; 



Mesosternum declivous. CALLOIDES. 



Mesosternum nearly flat, episterna narrower. ARHOPALPS. 



Glycobius Lee. is founded upon C. speciosus Say, a large 

 black and yellow species which infests the sugar maple. 



Calloides Lee. contains G. nobilis Harris, a large species of 

 the Atlantic States, and the nearly allied C. Lorquini Buquet, 

 of California. Arhopalus Serv. (Sarosesihes Thomson) con- 

 tains only C. fulminans Fabr. 



Group II. Clyti. 



The head is larger than in the Cyllenes, and the front much 

 longer, sometimes perpendicular, and quadrate ; the antenna? are 

 always short, not very different in the sexes, filiform, or slightly 

 thickened externally ; the episterna of the metathorax are usually 

 wide, and the epimera are produced over the angles of the 1st 

 ventral segment, the intercoxaj process of which is acute. The 

 thighs are usually clavate, the hind pair frequently very long, 

 and occasionally spinose at tip; the first joint of the hind tarsi 

 usually very long. 



Front rounded, declivous, thighs not spinose at tip, episterna of meta- 

 thorax wide ; 



Head not carinated. CLTTPS. 



Head cariuated. XYLOTRECHUS. 

 Front quadrate perpendicular ; head not carinated ; 



Episterna of metathorax wide. NEOCLYTUS. 



Episterna of metathorax narrow. CLYTANTHUS. 



Clytus is represented by C. marginicollis Lap. in the Atlantic 

 States, and C. lanifer Lee. in Arizona. 



Clytanthus by C. ruricola Oliv. and albofasciatus Lap. in the 

 Atlantic States. 



The other two genera are distributed over our whole territory, 

 and contain many species. 



Group III. Anaglypti. 



The head is also large, and the front long, and quadrate; the 

 antennae slender, moderately long, with the joints 3-5 sometimes 

 spinose at tip ; the prothorax is not narrowed in front, but always 

 much constricted behind ; the elytra are frequently gibbous at 

 the base, and declivous at tip, and sometimes have transverse 



