ORDER COLEOPTERA. 189 



in its middle. The ligula is almost square, with the para- 

 glossae projecting and going to a point. 



Casnonia, Lat., OphioncBa, Klug., 



Whose corslet has almost the form of a truncated cone, or of 

 a cylinder narrowed anteriorly.* 



Leptotrachelcis, Latr., 



In which this part of the body is pretty nearly cylindrical 

 without any sensible contraction in front, in which the ely- 

 tra are not truncated, and the tarsi have their penultimate 

 articulation bilobate. Odacantha Dorsalis, Fab. 



Odacantha, Payk., Fab., 



Similar as to the corslet, but with truncated elytra, and the 

 articulations of the tarsi entire. 



The species which serves as a type to the genus {odacan- 

 tha . melanura. Fab. Clavis Entom. Helv. II. v. Hist. Nat. 

 des Coleop. d'Eur. II. x. 6), is three lines in length, of a 

 greenish blue, with the elytra, their extremity excepted, 

 of a reddish yellow. The base of the antennae, the breast, 

 and the principal part of the tarsi, are also of this colour. 

 The end of the elytra is of a blackish blue. This species 

 frequents aquatic places, and more particularly inhabits the 

 north of France, Germany and Sweden. The odacantha 

 tripustulata of Fabricius is a species of notoxus. 



* Consult Entomol. Brasil of M. Klug; Spec. Gen. of M. le Comte 

 Dejean, torn. I. p. 170; Hist. Nat. des Coleop. d'Eur. fasc. II. vii. 6. The 

 species which is figured {cynocephala) forms, in consequence of the penul- 

 timate articulation of the tarsi, a peculiar division. It is found in Ben- 

 gal. All the others, the principal of which is the Aitelabiis Pennsylvanicus 

 of Linnaeus, are American, and have all the articulations of the tarsi en- 

 tire. 



