44 L1MNOPHILUS RHOMBICUS 



about to pupate, varies very considerably in the 

 method of construction from that made by 

 species of other families, notably the Sericostom- 

 atidce, and I show this grating in Fig. 15. Limno- 

 r } lom i ) i CUS) another species in the same 



FIG. 16. Pupal grating of Limnophilus rhombicus. 



genus, makes a grating very similar in design, 

 shown in Fig. 16, and I have little doubt that 

 further investigation will prove that most, if not 

 all, species of a particular genus make gratings 

 on the same general plan. 



