I5« 



R. W. CROSSKEY 



174 



175 



176 



177 



180 



178 179 



Figs. 174-180. Showing range of form of the pupal gill in species of the subgenus Eusimul- 

 ium from Africa and its islands. 174, 175, 179 and 180, ruficorne-grou-p. 176-178, 

 loutetense-group. The gills shown in figures 175, 179 and 180 are those of species from St. 

 Helena, the Seychelles, and Madagascar respectively. (Fig. 180 redrawn from Grenier 

 & Grjebine (1963)). 



