180 CLASS INSECTA. 



gated, and seem to form a peculiar section. They do not 

 fly away like the preceding, when about to be seized, but 

 endeavour to escape by running very fast. M. Gotth. Fis- 

 cher, in his entomology of Russia, has placed a species of 

 them from Brazil, in his sub-genus Theratus {T. Margina- 

 tus). 



All these species have wings, but some apterous ones are 

 known, whose abdomen, moreover, is more narrow and oval, 

 and in which the tooth of the emargination of the mentum is 

 very small, and scarcely sensible. Such is that which we 

 have represented in our Natural History of the Coleoptera of 

 Europe (I. 1. 5.), undei* the name of coarctata, M. Le Comte 

 Dejean (Spec. gen. des Coleop. II. p. 434,) has formed with 

 them a new genus, that of Dromica. 



Sometimes the body is long and narrow, and with the 

 corslet elongated in a knotty form, but narrowed in front. 

 The third articulation of the two anterior tarsi of the male, is 

 in the form of a palette, and advanced interiorly. The fol- 

 lowing one is inserted externally near its basis — 



Ctenostoma, Klug. Caris, Fisch. 



This sub-genus has hitherto appeared to be peculiar to 

 the intra-tropical countries of South America. The head is 

 bulky, with the antennae almost as long as the body, and 

 almost setaceous. The external palpi are greatly projecting, 

 and terminated by a thicker articulation, in the form of an 

 elongated pear. The penultimate articulation of the external 

 maxillary ones shorter than the following, the first two of 

 the labial are very short, and the terminal lobe of the jaws is 

 without any sensible unguiculus at the end. The abdomen 

 is oval, contracted at the base, and pediculated. The feet 

 are long and slender. 



The Ctenostomata approach, in the relation of the size 



