412 INSECTA. 



Their body is soft, wliitish, thickest anteriorly, and the head squa- 

 mous and provided with stout mandibles, but without any other 

 projecting part. They do much injury to trees, the large ones par- 

 ticularly, perforating them very deeply, or boring holes in them in 

 every direction. Some of them attack the roots of plants. The 

 abdomen of the females is terminated by a tubular and horny ovi- 

 positor. These Insects produce a small sharp sound by the rubbing 

 of the pedicle of the base of their abdomen against the interior of 

 the parieties ofthe thorax. 



We will in the first place divide the Longicornes into tv^o sections. 



In those of the first, the eyes are either strongly emarginated or 

 lunate, or elongated and narrow; the head is plunged into the tho- 

 rax, as far as those organs, without being distinguished from it by 

 an abrupt contraction of its diameter, forming a kind of neck; in 

 several it is vertical. 



These Longicornes are subdivided into Iveo principal sections or 

 small tribes. 



1. The Prionii, characterized as follows: the labrum null or very 

 small and indistinct; the mandibles stout, or even very large, parti- 

 cularly in most ofthe males; the internal lobe ofthe maxillae null or 

 very small; the antennae inserted near the base ofthe mandibles or 

 the emargination of the eyes, but not surrounded by the latter at 

 base; the thorax most frequently trapezoidal or square, crenated or 

 dentated laterally. 



The first genus, or 



Parandra, Lat, 



Where, as in the following, the antennje are simple, almost granose, com- 

 pressed, of equal thickness throughout, and as long as the thorax at most, 

 is distinguished from that genus, as well as from all others of the same 

 family, by its corneous ligula, which is in the form of the segment of a very 

 short, transversal circle without emargination or lobes. The body is a 

 parallelepiped, and depressed, and the thorax square, rounded at the pos- 

 terior angles, and without spines or teeth. These Insects are pecuhar to 

 America. 



Spondylis, Fab. 



The Spondyles, which approximate to the Parandrs in their antennae and 

 the exiguity of their maxillary lobes, are removed from them by their hgfula,- 

 the latter, as in all the following Longicornes, is membranous and cordiform 



