ORDER COLEOPTERA. 319 



The anterior extremity of the praesternum advances over the 

 under part of the head, and its edge is arched. 



Some have the labrum and mandibles concealed by the 

 anterior extremity of the praesternum; the chaperon, or 

 epistomer, being widened and applying itself to this part. 

 Such are 



Cryptosoma, Dej. Elater, Fab., 



Which have the internal angle of the third articulation of 

 the antennae, and the seven following, prolonged in the 

 manner of a tooth. The second and fourth articulations are 

 shorter, the last long and narrow, and a straight and linear 

 branch at the internal side of the third, near its origin. 



The mandibles are unindented under the point. The 

 jaws present but a single lobe. They, as well as the tongue, 

 are small and membranous. The palpi are very short. The 

 tarsi are small, slight, and almost setaceous. 



The only known species (Elater denticornis. Fab.) is 

 found at Cayenne, from which it has been sent to the 

 Museum of Natural History by M. Banon, 



Nematodes, 



In which the antennae have the first articulation elongated, 

 the following five in a reversed cone, equal, with the excep- 

 tion of the first between them, or the second, which is a 

 little shorter, and the last five thicker, almost perfoliated, 

 and that of the top ovoid. 



The body is almost linear.* 



The labrum and mandibles are now discovered. 



Here the antennae of the males are terminated fan-like. 

 These are 



• Eimcmisfiliim, Manner. 



