79! 



FIGURES 116-118. Building of cases of the larvae of Hydroptilidae (after Nielsen): 



116 — weaving of supporting ring of the larva of Oxyethir a costalis; 117 — 

 larva of Agra y lea multipunctata during weaving of case; 118 — beginning 

 of weaving ofcase of Orthotrichia tetensii. 



72 



