﻿285 



9"^ abdominal segment without any median furrow 



Corymbiles 



17. Nasale ending in 1 tooth .... Corymbites æneus 

 Nasale ending in 3 teeth ^°- 



18. Space between the cerci small with a narrow aper- 

 ture to the rear. Inner prong of cerci quite smooth. 

 A triangular area behind on each segment rather 



unpunctulate Campylus 



Space between the cerci either large with a wide 

 aperture or small with narrow aperture, but then 



the inner prong of cerci has a large backwards- 

 pointing tooth or is very rough ^f'hous 



18 



