COLEOPTERA. 467 



Dryops, Oliv. — Parnus. Fab. 

 In Dryops proper, the antennse, shorter than the head, are I'eceived 

 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 triangu- 

 lar palette, and projects in the manner of an auricle, whence the name 

 of Dermeste a oreilles, given to the most common species by Geof- 

 froy *. The palpi are not salient. 



2. Those in which the antennse, composed of eleven joints, are fili- 

 form, or merely a very little thicker near the extremity, and at least 

 nearly as long as the head and thorax. 



Elmis, Lat. — LiMNius, Illig. 

 They are found in water, under stones, or on the leaves of the 

 Nymphaea f . 



3. Those in which the always very short antennae consist of but 

 six or nine joints, and terminate in an almost solid, oval, or nearly 

 globular club. 



Macronychus, 3IiilL, Germ, 

 These Insects have five distinct joints in the tarsi, an oblong body, 

 and antennse of six segments, the last of which — perhaps composed of 

 three — forms an oval club ; they can be folded under the eyes J. 



Georissus, Lat., Gyll. — Pimelia, Fab.] 

 Here the tarsi consist of but four joints ; the body is short, turgid 

 and almost globular, and the abdomen embraced by the elytra ; the 

 antennae are composed of nine joints and terminate in a round club 

 formed by the three last §. 



FAMILY V. 



PALPICORNES. 



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

 observe antennse terminating in a club, usually perfoliaceous, but 

 consisting of nine points 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. 



The body is usually ovoid or hemispherical, convex or arched. 

 The legs in several are adapted for natation, and then consist of but 



* Latr. Gen. Crust, et Insect., II, 55; Schoenh., Synon. Insect, I, ii, p. ii6 

 The Drijops Dumerilii presents some differences in the length of the legs, the form 

 of the antennae and thorax, -nhich have induced Doctor Leach to form a separate 

 genus — Dryops — for it. The other species re-enter Parnus. 



t Latr., lb., II, p. 49; Schoenh., lb. I, ii, p. 117; Gyllenh., Insect. Suec. I, 

 p. 551. 



+ Macronychus quad rilulerculatus, Miill. ; Illig., Mag., V; Lat., Gener. Crust, et 

 Insect., II, p. 58; Parnus obscurus, Fab. ; Germ., Insect. Spec. Nov., I, p. 89. 



II Pimelia pygmcea. Fab., Georissus pygmceus, Gyll,, Insect. Suec, I, iii, p. 675; 

 Trox dubius, Panz., Faun. Insect. Germ. LXII, 5. 



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