LONa-HORNED WOOD-EOREES. 



157 



of the larger species. They differ from all the other Longicorn beetles, 

 (with a few rare exceptions,) in having their heads vertical, the front 



[Fig. 77.] 



* C 



Saperda bivittata, Say ; the Round-headed apple-tree borer -.—a, larva ; h, pupa ; c, beetle — after Riley. 



or forehead presenting a prominent angle, and the face falling perpen- 

 dicularly below it, so that when viewed directly from above the face 

 cannot be seen. This position of the head, in connection with their 

 long curved horns, gives to these beetles a fanciful resemblance to a 

 goat, and terms indicative of this similarity often occur in their nomen- 

 clature. They are also distinguished by the rather long and si)indle- 

 shaped last joint of their palpi, especially the maxillaries, and by a 

 little groove almost always found on the inner face of their tibioe. The 

 granulations of the eyes, which are usually coarse in the Prionides and 

 fine in the Lepturides, and which serve to separate the Cerambycides 

 into two nearly equal sections, are so variable in the Lamiides as to be 

 of but little value in classification. 



These insects generally remain stationary by day upon the trunks 

 and branches of trees, and often escape detection by the resemblance 

 which they bear, in the hues and sculpture of their bodies, to the color 

 and inequalities of the bark on which they repose. Their colors are 

 therefore, as a general rule, less vivid than those of the Cerambycides, 

 their prevailing tints being brown and gray. 



This is the most numerous sub-family of Lougicornes, and is said to 

 contain as many genera and species as the other three sub-families 

 united ; but in this country they do not appear to be more numerous 

 than the Cerambycides. 



The larvsB resemble those of the Cerambycides in being of a nearly 

 cylindrical form, but a little tapering behind, and considerably swollen 

 at the anterior extremity, with a small head, which is retractile within 

 the enlarged anterior segment. These larvse differ, however, from those 

 of nearly all other Longicorns in being wholly destitute of legs. 



