COLEOPTERA, 373 



The emarglnaticn of the mentum has a central tooth. The ligula is 

 almost square, and its paraglossae are salient and pointed. 



Casnonia, Lat. — Ophioncea, Klikj. 



The thorax almost like a truncated cone, or a cylinder narrowed 

 anteriorly*. 



Lbptotrachelus, Lat. 



Thorax cylindrical, and without any sensible contraction ante- 

 riorly ; elytra entire or not truncated ; penultimate joint of the tarsi 

 bilobate f . 



Odacantha, Payk. Fab. 



The same kind of thorax, but the elytra are truncated and the 

 joints of the tarsi entire. 



Odac. melanura. Fab.; Clairv., Entom. Helv. II, v; Hist. Nat. 

 des Coleop. d'Eur., II, x, 6. The type of the genus; three lines 

 in length; greenish-blue; elytra, the extremities excepted, rus- 

 set-yellow ; base of the antennae, pectus, and a greater portion 

 of the feet of the same colour ; ends of the elytra blackish-blue, 

 it frequents the neighbourhood of water, and is more particu- 

 larly found in the north of France, Germany and Sweden J. 



Sometimes the exterior palpi are terminated by a thicker triangu- 

 lar joint, or one resembling a reversed cone ; the head, directly 

 behind the eyes, is suddenly narrowed, and has a triangular form, 

 or that of a heart. 



Some in which the body is flattened, placed by Fabricius among 

 his Galeritse, have all the joints of the tarsi entire, the thorax cord- 

 ate and posteriorly truncated, and the mandibles as well as the max- 

 illae of an ordinary length or but slightly salient. 



The first joint of the antennae forms a reversed and elongated cone. 

 The ligula is square, and its paraglossae are usually as long as itself; 

 the middle of the emargination of the mentum is furnished with a 

 tooth, These Carabici, of which the species indigenous to Europe 

 are found under stones, bark, and most commonly in the vicinity of 

 water, form the three following subgenera. 



ZupHiUM, Lat. 



First joint of the antennae at least as long as the head ; exterior 

 hiaxillary palpi much elongated §. 



* See Entom. Brazil., of Klug ; the Spec. Gener., of Dej., I, p. 170; Hist. 

 Nat. des Coleop. d'Eur., fascic. II, vii, fi. The species figured — C. cyanocephala — 

 from the penultimate joint of the tarsi forms a particular division. It is found in 

 Bengal. All the others, the principal of which is the Aflelal/us pensylvanicus, It,, 

 belong to America, and have all the joints of the tarsi entire. American species, C. 

 pi-nsylvanica, rufipes. 



t Odacantha dorsalis. Fab. 



X The Odacantha tripustulata, Fab., is a species of Notoxus. 



§ Galerila olens, Fab. ; Clairv. Entom. Helv. II, xvii, A, a ; Hist. Nat. des Co- 

 leop. d'Eur., fasc. II, x, 3. 



