346 COLEOPTEBA OF NORTH AMERICA. 



scarcely diminish in length. The prothorax is cylindrical, 

 entirely unarmed, and without tubercles ; the elytra are wider 

 than the prothorax, cylindrical, usually rounded at tip, rarely 

 (calcarata) the suture is armed with a spine, or (obliqua) the tip 

 is attenuated and acuminate. 



The front coxae are angulated externally with distinct trochantin, 

 and closed behind ; the middle coxal cavities are angulated, open 

 externally, with distinct trochantin. The prosternum is very 

 narrow between the coxse, and the mesosternum acute behind. 

 The side pieces of the metasternum are very broad in front, and 

 narrowed behind; a character not seen in the preceding tribes. 

 The ventral segments are nearly equal, the 5th somewhat longer, 

 somewhat truncate (?) or emarginate ($). Legs moderate, 

 nearly equal, thighs not clavate, middle tibiae without tubercle 

 or sinus; hind tarsi with 1st joint not much elongated; last joint 

 rather short in general, claws divaricate; the inner one of the 

 front and middle pair in the $ of most of our species armed with 

 a rounded lobe or tooth, which is wanting in S. moesta, and con- 

 color, and in the European species. 



The genus Saperda alone is represented in our fauna. Thus 

 far, none have been found on the Pacific slope, except S. moesta, 

 a northern species, which extends from Canada to Oregon. 



Some of the species are very destructive to cultivated trees, 

 boring into the wood, or destroying the subcortical tissues of the 

 roots. 



Tribe XV. PHYT<ECIINI. 



This tribe contains all those species in which the claws are 

 similar, appendiculate or cleft in both sexes ; except in Phaea and 

 Oberea the claws are divergent ; in the last named genus they 

 are divaricate in the front tarsi, and either divergent or divaricate 

 (0. Schaumii) on the hind pair; in Phasa they are divaricate on 

 all the tarsi. 



The front is moderately convex, broader than long, the eyes 

 are finely granulated, emarginate or divided; palpi slender, last 

 joint elongate oval, nearly pointed ; antennae shorter, or at most 

 not longer than the body, scape cylindrical, more slender and 

 shorter than 3d joint (Oberea), stouter and nearly equal to 3d 

 joint in the others. Prothorax cylindrical, or obtusely tubercu- 

 late on the sides ; elytra cylindrical, rounded or truncate at tip. 



