82 HEMIPTERA. 



others, especially in the genus Cicada, it is so 

 small as to form, as it were, the connecting link 

 between insects with semi-coriaceous elytra, 

 and those with their four wings entirely naked. 

 If it be absolutely necessary that the classific 

 character should be uniform, and constant in 

 all the genera, we ought rather to depend on 

 the form of the mouth, which is a species of 

 rostrum, or beak, bent inwards along the breast, 

 and is a character which is not only easily per- 

 ceived, but belongs exclusively to the insects of 

 this Order. 



