4>72 CLASS INSECTA. 



Let us first treat of the sub-genera, in which the middle of 

 the chest does not present any elongation like a point or 

 horn. 



Hexodon, Oliv. Fab. 



Their body is almost orbicular, even underneath, with the 

 head squared, received into a deep emargination of the cors- 

 let, the outer edge of the elytra dilated, and preceded by a 

 furrow. The legs slender, and the crotchets of the tarsi very 

 small and equal. 



The labrum is not apparent. The knob of the antennae is 

 small. The jaws are strongly toothed. See Oliv. and Lat., 

 Gener. Crust. II. 106. 



Cyclocephala, Latr. Chalepus, Macleay. Melolontha, 



Fab. 



Have the body ovoid, with the head free, the elytra slightly 

 bordered without dilatation or lateral furrow, and the ante- 

 rior tarsi terminated by a knobbed articulation ; the hooks 

 unequal, and both bifid. 



The anterior edge of the labrum is apparent. The mandi- 

 bles are narrow, without emargination or observable sinus on 

 the outer side, and but little surpassing the edge.* 



In the following sub-genera the sternum advances to a 

 conical point, more or less long, pointed or round at the end, 

 between the second legs. 



The anterior edge of the labrum is always apparent. The 



* Melolontha germinata, barbata, castanea, signata, ferru^nea, melano- 

 cephala, pollens, &c. of Fab. In the first the mandibles are strong, 

 arched, and crooked at the end. M. signata, nielanocephala, &c. are 

 smaller, straight, truncated, or obtuse at the end. The summits of the 

 jaws and mentura are moreover furnished with hairs. From this we might 

 form of these and their analogous species a peculiar sub-genus. All these 

 insects are from South AmcriLU. 



