544 Div. 3. ARTICULATA.— INSECTA. Class 3. 



TuooosiTA, Olivier. 



Tro<7o*i7a proper, has the antennae shorter than the thorax, tlie mandibles shorter than the head, and the luax- 

 ill« with a siiiffle lolie. 



Troiioxila matirilanira, Linn., a tiat beetle, fmir lines Ion?, of a pitchy black colour, found in nuts, bread, and in 

 the bark of trees : its larva, known in Provence under the name of the Cadelle, attacks grain. 



Pioxtomis, Latr. {Mefjagnatliim, Mes.), has the mandibles very Icnjf, and two lobes to the maxill*; the body ia 

 long' and narrow. T/ot/os mandibulaiis, [a continental species]. 



Pasxandra, Dalm., has the antennas nearly as lon^as the body, with the eleventh joint alone of the antennae en- 

 larjfed, in form of a reversed triangle, [lixotic species, lately monographed by Mr. Newman.] 



THE THIRD FAMILY OF THE COLEOPTERA TETRAMERA,— 

 The Platysoma, — 



Approaches the last in respect to its internal anatomy, entire tarsi, anrl habits ; but the antennae arc of 

 equal thickness, or slendered at the tips ; the mandibles are always exposed ; tlie palpi short, body 

 depressed, and thora.v nearly square. These iasects are lound under the bark of trees, and may be 

 united into the single genus 



Cucujus, Fabricius, — 



CuCT(/«« proper, has the antennae shorter than the body in many species, with the basal joint shorter than the 

 head. [C. clavipes, depressnx, &c. See my memior on these insects in Zoolog. Journal.'] 



Dendrophagus, Gyll., has the antennae longer, and cylindrical, with the basal joint lona-er than the head. 



Vleoiota, Latr. (Brontes, Fabr.), has similar antennae, but the third joint is as long as the following ; the mandi- 

 bles, in the typical species, are furnished with a long horn-like appendage. 



THE FOURTH FAMILY OF THE COLEOPTERA TETRAMERA,- 

 The Longicornes, — 



Has the three basal joints of the tarsi furnished beneath with short brushes ; the first and second [not 

 the second and third, as descri!)ed by Latreille], being heart-shaped, and the third [not the fourth] 

 deeply bilobed, with a small nodule, representing a joint, at the base of the terminal joint ; the labium, 

 placed n])on a short transverse mentum, is generally membranous, heart-shaped, or bifid ; or horny, and 

 in shape of a very short transverse segment of a circle, in others (Parandra). The antenna; are fili- 

 form or setaceous, generally at least as long as the body, either simple in both se-ices, or serrated, 

 pectinated or fan-shaped in the males; the eyes of the greater number are kidney-shaped, surrounding 

 the base of the antennae ; the thorax is trapeziform or narrowed in front ; in those which have the eyes 

 rounded entire, or scarcely emarginate ; in which case the legs are long and slender, with the tarsi 

 elongated. 



The larvae, nearly all of which reside in the interior of trees, or under the bark, are destitute of feet, 

 or have them only very small ; the body is soft, whitish, thickest in front, with the head scaly, and 

 furnished with robust mandibles, the other parts not being prominent. They do much injury to trees, 

 especially those of large size, piercing them very deeply, or forming burrows in them. (See the memoir 

 of Lansdovm Guilding, in the 13th vol. of the Linncean Transactions). Others devour the roots of 

 plants ; the females have the abdomen terminated by a tubular and horny oviduct. These insects 

 produce a slight sharp sound, by the friction of the peduncle of the base of the abdomen against the 

 inner recess of the thorax, when they alternately cause it to enter and withdraw it. 



In the system of Linnaeus, these insects form the genera Cerambyx, Leptura, Necijdales, which 

 Geoffroy, Fabricius, and other naturalists have endeavoured to arrange and simplify by the transposition 

 of species, or by establishing other generic groups. From the immense quantity of species discovered 

 since the days of Linnaeus, and the insufficiency of the characters assigned to these genera, a complete 

 revision of the family had become necessary, [which, since the publication of the last edition of 

 this work, has been effected by Serville, in the Annates de la Societe Entomologique de France, in 

 which a series of long memoirs has been published by this author, containing numerous new genera, 

 the number of which has been greatly augmented by Messrs. Hope and Newman, in recent memoirs 

 published in this country]. 



Wc divide the Longicornes into two primary sections. 



The first section has the eyes either deeply notched or crescent-shaped, or long and narrow ; the 



