COLEOPTERA. 467 



from the second in the antennae, which are neither granose 

 nor perfoliate, and whose extremity, in the greater number, 

 is not thickened. The body is most frequently oblong, and 

 arcuated above, and the legs are elongated as in many other 

 Insects. With the exception of their antennae and size, the 

 males resemble the females. These Heteromera are usually 

 much more agile than the preceding ones ; several conceal 

 themselves under the bark of old trees, while most of the 

 others are found on leaves and flowers. Most of them were 

 referred by Linnaeus to his genus Tenebrio; he distributed the 

 remainder in JVecydalis^ Chrysomela. Ceramhyx and Can- 

 tharis. In the first edition of this work, we united these 

 Insects in the single genus Helops, but their internal as well 

 as external anatomy proves that we may divide them into 

 five tribes, attached to as many genera, viz. Helops, Cistela, 

 Dircaea, Fab., and the CEdemera and Mycterus of Olivier. 

 With respect to the biliary vessels, which have a caecal inser- 

 tion, or the posterior ones, we learn from M. Dufour^, 

 that this insertion is not effected in the two last genera as in 

 the first and other preceding heteromera, by a common trunk, 

 but by three canals, one of which is simple, the second bifid, 

 and the third trifid. In the (Edemerae he found salivary ves- 

 sels. Their head is more or less narrowed and prolonged 

 anteriorly in the form of a snout, and the penultimate joint of 

 the tarsi is always bilobate ; characters which seem to approx- 

 imate these Insects to the Rynchophora. With respect to the 

 alimentary canal, and several other considerations, Helops and 

 Cistela approach Tenebrio^ but the Cistelae have a smooth 

 chylific ventricle, entire mandibles, and usually live on flow- 

 ers or leaves, by which they are distinguished from Helops. 

 Most of the DircaeoD have the faculty of leaping, and the 

 penultimate joint of their tarsi, or at least of some, is bifid ; 

 some of them inhabit mushrooms, others old wood. 



These Insects are connected on the one hand with the He- 

 lopii, and on the other with the (Edemerae, and still more 

 closely with Nothns, a subgenus of the same tribe : such are 



