COLEOPTERA. 361 



I will divide this section into two tribes. The Insects which compose the 

 first, or the ACANTHOPODA, are remarkable for their flattened and tolerably wide 

 tibiae, armed anteriorly with spines: for their short quadriarticulated tarsi, 

 the hooks of which are of the usual size ; and for their depressed body. The 

 praesternum is dilated. The antennae are a little longer than the head, 

 arcuated and formed of eleven joints, the last six constituting an almost cylin- 

 drical and slightly serrated club; the second is short and not dilated. 



This tribe is composed of the single genus 



HETEROCERUS, Fabricius, 



These Insects are found in the sand or mud, along the borders of rivulets, 

 marshes, &c., issuing from their holes when disturbed by the trampling of 

 feet The form of their tibiae enables them to turn up the earth, and conceal 

 themselves in it ; their tarsi can be flexed upon the tibiae. There also reside 

 their larvae, which were first discovered by M. Miger. 



The second tribe, or that of the MACRODACTYLA, comprises Clavicornes 

 with simple, narrow tibiae and long tarsi, all one genus excepted (Georissus), 

 well distinguished from every other of the tribe, by its antennae of nine joints, 

 of which the three last form an almost solid club composed of five distinct 

 joints, the last of which is large, with two stout terminal hooks. The body is 

 thick or convex. The thorax is less rounded, and most commonly terminates 

 on both sides in acute angles. 



The principal type of this tribe is the genus 



DRYOPS, Olivier. 



In Dryops proper, the antennae, shorter than the head, are received into a 

 cavity situated under the eyes, and are almost covered by the second joint, 

 which is large, dilated, in the form of an almost triangular palette, and pro- 

 jects in the manner of an auricle, whence the name of Dermeste a oreilles, 

 given to the most common species by Geoffrey. The palpi are not salient. 



There are three subgenera : viz. Elmis, Macronychus, Georissus. 



FAMILY V. 



PALPIGORNES*. 



IN our fifth family of pentamerous Coleoptera, as in the fourth, we observe 

 antennae terminating in a club, usually perfoliaceous, but consisting of nine 

 joints at most in all, and inserted under the lateral and projecting edges of the 

 head ; they are never much longer than the latter and the maxillary palpi, and 

 frequently even shorter than the last mentioned organs. The mentum is large 

 and scutiform. 



* Palpi-horned. 



