GRANNOM LARVAE 



57 



The first act of the larva on emerging from 

 the egg is to make itself a case, quadrilateral 

 in shape, and composed of vegetable matter. 

 Some I bred in a glass jar containing neither 

 weed nor river soil made their first cases of 

 the discarded egg skins, faute de mieux. I give 



FlG. 29. Pupal grating of Brachycentrus subnubilus. 

 The grannom. 



an illustration of a group of larvae just emerged 

 or emerging from the eggs in Fig. 27, and the 

 male genitalia of the adult fly are shown in 

 Fig. 28. I also give a figure of the pupal 



