DIAPERIS. INSECTS. 291 



sunk posteriorly in the thorax ; and they want the corneous tooth on the internal 

 side of the jaws. Many are found on mushrooms, and others under the bark of 

 trees or on the ground. 



TillBE I. DlAPERlALES. 



Antennae generally more or less perfoliated, thickening towards 

 the end or terminating in a small club ; sides of the thorax 

 and elytra not margined. 



This tribe includes the following genera, according to Latreille, 

 Gen. PHALERIA, (Usoma, Dej. ;) CHELENODES, (Phaleria, Dej. ;) DIAPE- 

 RIS, PENTAPHYLLUM, HYPOPHL^EUS, ELEDONA, COXELUS, HALLOME- 

 NUS, and EUSTROPHUS. 



Gen. DIAPER is, Lat. Chrysomela, Lin. Tenebrio, De Geer. 



Body oval, convex ; antennae perfoliated in all their length ; 

 elytra coriaceous ; two membranous folded wings ; five joints 

 in the tarsi of the four anterior feet, and four in the posterior ; 

 males in many with two horns on the head more or less long. 



D. boletij Lat. Shining black ; elytra with three yellowish brown 

 transverse bands, of which the firyt has at its base, the second in 

 the middle, and the third at the extremity, longitudinal rows of 

 impressed dots. Inhabits Europe. Shaw, vi. pi. 18. 



TRIBE II. COSSYPHENES. 



Body flattened and clypeiform, bordered laterally by the sides 

 of the thorax and elytra ; head sunk under the thorax, or re- 

 ceived into a deep hollow at its anterior extremity. 



The genera of this family are, HELEUS, and COSSYPHUS. 



Gen. COSSYPHUS, Oliv. Fab. 



Antennae terminated in a perfoliated club ; last joint of the 

 maxillary palpi larger than the preceding, dolabriform ; body 

 oval, very flat, in the form of a shield, bordered around by 

 the thorax and elytra ; thorax almost semicircular, conceal- 

 ing the head. 



C. depressus, Fab. Antennae shorter than the thorax, of eleven joints, 

 of which the first six are almost cylindrical, the others compos- 

 ing a perfoliated club ; body a little longer than broad, depressed, 

 brownish ; thorax and elytra yellowish gray. Inhabits Southern 

 Europe, Barbary, and India. Lat. Gen. ii. 185. 



Tribe III. CRASSICORNES. 



Antennae abruptly terminated in a large club, either entirely 

 perfoliated, or compressed, and more or less serrated on the 

 internal side. 



Gen. TRACHYSCELIS, LEIODES, TETRATOMA, ORCHESIA, CNODALON, and 

 PROSTENUS. 



Gen. TRACHYSCELIS, Lat. 



Antennae scarcely longer than the head, terminated abruptly by 

 an ovoid perfoliated club of six joints ; mandibles entire ; 



