io CHARACTERS, &c. 



Their fuperficies is either 

 Scabrous, rough. 



Striated, marked with flight or (hallow 

 furrows. 



Porcated, with fharp longitudinal ridges, 



Su/cated, deeply furrowed : Or 



jPunSiuated, marked with concave or con-* 

 vex fpots. 



The upper wings, or wing-cafes, are call- 

 ed hemelytra, when of a fubftance harder 

 and ftronger than the membranaceous 

 wings which they cover, and yet fofter 

 than the elytra of the Cokoptera. 



The halteres (poifers) are placed under 

 the wings of Dipterous infeffs, or fuch as 

 have but two wings, and probably ferve to 

 keep their bodies in equilibrio, when in the 

 afl: of flying ; they are compofed of a head 

 fixed at the end of a fmall pedicle or 

 ftalk. 



As 





