COLEOPTERA. 385 



and frequently in the mud: some of them — Dryops — are allied to 

 the Gyrini by the structure and shortness of their antennae. 



I will divide this section into two tribes. The Insects which com- 

 pose the first or the Acanthopoda are remarkable for their flatten- 

 ed 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 antennas are a little longer than the head, arcuated, and form- 

 ed of eleven joints, the last six constituting an almost cylindrical 

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



This tribe is composed of the single genus 



Heterocerus, Bosc. Fab. 

 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 tibise enables them to turn up the earth, and con- 

 ceal themselves in it; their tarsi can be flexed upon the tibise. There also 

 reside their larvje, which were first discovered by M. Miger. 



The second tribe, or that of the Macrodacttla, comprises Cla- 

 vicornes with simple, narrow tibiae and long tarsi, all — one genus 

 excepted (Georissus), well distinguished from every other of the 

 tribe, by its antennas 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 con- 

 vex. 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, Oliv., 

 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, dUated, in the form of an almost triangular palette, and 

 projects in the manner of an auricle, whence the name of Dermeste a oreilleSf 

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

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



2 Y 



