381- 1NSECTA. 



emarginated or bifid, corneous and forming the segment of a very short and 

 transversal circle in others. The antenna; are filiform or setaceous, most com- 

 monly as long at least as the body ; they are sometimes simple in both sexes, 

 and sometimes serrated, pectinated, or flabelliform in the males. The eyes of 

 a great many are reniform and surround them at base. The thorax is trape- 

 zoidal or narrowed before, in those where the eyes are rounded and entire, or 

 but slightly emarginated ; even in this case the legs are long and slender, and 

 the tarsi elongated. 



As almost all their larvae live in the interior of trees, or under their bark, 

 they are destitute of feet, or have but very small ones. Their body is soft, 

 whitish, thickest anteriorly, and the head squamous and provided with stout 

 mandibles, but without any other projecting part. They do much injury to 

 trees, the large ones particularly, 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 ovipositor. 

 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 of the thorax. 



We will in the first place divide the Longicornes into two sections. In 

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

 elongated and narrow ; the head is plunged into the thorax, 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 two principal sections or small 

 tribes. 



1. The PRIONII, characterised as follows: the labrum null or very small 

 and indistinct ; the mandibles stout, or even very large, particularly in most of 

 the males; the internal lobe of the maxillte null or very small; the antennae 

 inserted near the base of the 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, Lalreille, 



Where, as in the following, the antennae 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 peculiar to 

 America. 



SPONDYLIS, Fabricius. 



The Spondyles, which approximate to the Parandrae in their antennas and 

 the exiguity of their maxillary lobes, are removed from them by their ligula; the 



