COLEOPTERA. 359 



NlTIDULA. 



In some the antennal club consists of but two joints, and the anterior part of 

 the head projects in the manner of a semicircular flattened clypeus, covering 

 the mandibles and other parts of the mouth. 



COLOBICDS, Latreitte. 



In this and the following subgenus, the tarsi, from the point where they are 

 moveable, seem to consist of but four joints, of which the three first, much 

 shorter than the last, are entire, and simply furnished underneath with a 

 greater or smaller number of hairs; the first, as in several of the Cleri of 

 Fabricius, is only visible underneath, where it forms a little projection; it is 

 also pilose. 



The remaining subgenera are Thymalus, Ips, Cercus, and Byturus. 



Those that compose our sixth tribe, that of the ENGIDITES, analogous to the 

 Nitidularise in the emargination of the extremity of their mandibles, are 

 distinguished from them by their not projecting, or but very little and simply 

 on the sides, beyond the labrum. Their body is oval or elliptical, and the 

 anterior extremity of the head slightly extended into an obtuse or truncated 

 point. The tarsi consist of five distinct joints, entire, and at most, slightly 

 pilose underneath ; the penultimate is somewhat shorter than the preceding 

 one. The antennae terminate in a perfoliaceous triarticulated club ; the elytra 

 completely cover the abdomen, and the palpi are somewhat thicker at the 

 extremity. Some very small species inhabit the interior of houses, and are 

 frequently found on windows. 



We will unite them all in a single genus, that of 



DACNE. 



Their antennae terminate abruptly in a very large orbicular or ovoid and 

 compressed club, composed of crowded joints, of which the middle one at 

 least is much wider than it is long; the third is longer than the second and 

 fourth. 



We now come to certain tribes in which the praesternum is frequently 

 dilated anteriorly in the manner of a chin- cloth, and which differ from the 

 preceding ones in their feet, which are either wholly or partially contractile; 

 the tarsi may be free, but the tibiae at least can be flexed on the thigh. The 

 mandibles are short, and generally thick and dentated. The body is ovoid, 

 thick, and covered with deciduous scales or hairs of various colours. The 

 antennae are straight and usually shorter than the head and thorax. The 

 head is plunged into the thorax as far as the eyes. The thorax is but 

 slightly or not at all bordered, trapezoidal, and wider posteriorly; the middle 

 of its posterior margin is frequently somewhat prolonged or lobate. The 



