^2\){] CLASS INSECTA. 



We know but a small number of species which have not 

 been yet described, and which inhabit French Guiana and 

 Brazil. 



ZYKornoRus, Dalm. Leptochire, Germ. IrencEus, Leach. 

 Oxytelus, Oliv. Piestits, Grav. 



Whose body is depressed ; whose anterior limbs, broader 

 than the others, are alone denticulated externally ; which 

 have the head transverse, the corslet squared, the antennae of 

 the same thickness throughout, as long at least as the head 

 and corslet, composed of articulations for the most part ovali- 

 form, or cylindrical, and rounded at the two ends, and the 

 mandibles as long as the' head, and denticulated at their ex- 

 tremity.* 



Prognatha, Lat. Blond. Siagona, Kirby, 



Which differ but little from Zyrophorus, but in their fili- 

 form antennae, comprised of elongated articulations. {Sia- 

 gonum qiiadi^icorncy Kirb. and Spenc. Introd. Entom. I. i. 5. 

 Blondel, Annal. des Se. Nat. April I8I7, XVII. 14-17.) 



CopROPHiLus, Lat. Omalium, Grav. Oliv. Gyll., 



In which the body is still flatted, but all the limbs are 

 denticulated, or spinous externally. The antennas much 

 longer than the head_, are grained, and thicken insensibly 

 towards the endj and the mandibles arched externally, almost 

 into a crescent, are not sensibly denticulated, and are pro- 



* See Dalman, Anal, en torn. p. 23, his Z. Fronticornis, iv. fig. 1. appears 

 to be the Oxytelus bicornis of Olivier. (Encyc. Method.) That which he 

 names, j^^nicillatus, ibid. fig. 2, appears to have great relations with the 

 piestus sulcatus ot" M. Gravenhorst. The leptochirus scoriaceus of M. Ger- 

 mar, (Insect. Spec. Nov. I. i.) is a species very distinct from the pre- 

 cedins'. 



