220 MANDIBULATA. — COLEOPTERA, 



Subsection II. — Longicornes. 



Head not rostrated anteriorly : antennas filiform or setaceous, rarely clavate, 

 generally simple and more or less elongate; sometimes very long: mandibles 

 generally large, robust : "palpi conspicuous : body more or less elongated, some- 

 times depressed : tarsi various, mostly tetramerous or obscurely pentamerous. 



Of this interesting series of insects, there are evidently two 

 distinct groups : — the first of which has the body considerably de- 

 pressed, with the tarsi, at least in one sex of some of the species, 

 heteromerous and entire, the legs short, the antennae somewhat 

 elavate : — the other — by far the most extensive — with the body 

 more or less cyllndric, elongate, the legs, and especially the an- 

 tennae long, the latter filiform, the tarsi tetramerous, with the three 

 basal joints pilose, and the penultimate deeply bilobed : — all the 

 species, homever, agree in habit ; their larvse are destitute of legs, 

 or these parts are very small ; the body is soft, whitish, robust an- 

 teriorly, with the head scaly and furnished with stout mandibles : — 

 they subsist beneath the bark of trees, or in the interior of their 

 substance, piercing them sometimes to a considerable depth, so as 

 to cause their destruction ; some few attack the roots. 



The following families appear to belong to this division, which 

 may be distinguished by the subjoined external characters : 



Corjpus valde depressum : . . . . .45. CvcvjmJE. 



convexura, aut paulo depressum. 

 Oculi emarginati. 



iaSnww minimum, vel obsoletum : . . 46. Pjiionid^. 



exsertum : . . . .47. CerambyciDjI;. 



Oculi integres aut subemarginati : . . . 48. Lepturid^E. 



Family XLV.— CUCUJID^ mild. 



Body very much depressed, elongate, or oblong : antennce shorter or longer than 

 the body, sometimes incrassate at the apex, or subfiliform, the extremity 

 being slightly attenuated. Labrum exserted, coriaceous or membraneous: 

 mandibles robust, trigonal, the external side sometimes produced, the apex 

 acute, bidentate: maxillw furnished with a single, or with two processes at 

 the base : head porrect, exserted : thorax subquadrate, or subcordate-truncate, 

 more or less remote from the abdomen : legs short : tarsi various, entire. 



The insects of this family, which, as before noticed, may require 



