COLEOPTERA. 371 



at least at its posterior margin, but slightly or not at all bordered; in which 

 the maxillary palpi terminate by a securiform joint or one of an analogous 

 figure, and where the antennae insensibly enlarge. 



Here we have Crt/pticus, Latreille ; and Opatrum, Fabricius. 



2. Those in which the body is narrow and elongated, almost of the same 

 width posteriorly or wider; where the thorax is nearly square, and at least 

 almost as broad as it is long, and where the antenna- form a thick club, or are 

 abruptly dilated at the extremity. 



To this division belong Corlicus, Ortkocerus, Toxicum, &c. 



3. Those in which the body is equally narrow and elongated, and the thorax 

 almost square, but where the antennae are of the ordinary thickness, and are 

 not abruptly terminated by a club. 



The two anterior thighs are stout, and the tibiae narrow and curved, or 

 arcuated. 



The genera are Calcar, Upis, Tenebrio proper, and Heternlarsus. The 

 Tenebrionites are very common under bark of trees, on old walls, and the 

 uninhabited parts of houses. 



FAMILY II. 



TAXICORNES. 



IN this second family of the heteromerous Coleoptera, we find no small 

 corneous tooth on the inner side of the maxillae. All these insects are winged, 

 their body is most commonly square, their thorax trapezoidal or semicircular, 

 and concealing or receiving the head. The antennae, usually inserted under a 

 marginal projection of the sides of the head, are short, more or less perfoliate 

 or granose, enlarge insensibly, or terminate in a club. The legs are only 

 adapted for walking, and all the joints of the tarsi are entire, and terminated 

 by single hooks; the anterior tibiae are frequently broad and triangular. 

 Several males have the head furnished with horns. Most of them inhabit the 

 fungi on trees, or under the bark ; some live on the ground, under stones. 



In some, the head is completely exposed, and never entirely received into a 

 deep notch in the anterior of the thorax. This last is sometimes trapezoidal 

 or square, and at others almost cylindrical ; its sides, as well as those of the 

 elytra, do not extend remarkably beyond the body. 



This division will form the tribe of the DIAPEBIALES, the type of which is 

 the genus 



DlAPERIS. 



In Diaperis properly so called, the maxillary palpi terminate in an almost 

 cylindrical joint, hardly thicker than the penultimate ; and the anterior tibiae, 

 hardly or not at ah" wider than the following ones, are narrow, almost linear, 

 and slightly dilated at the extremity. 



BBS 



