— 182 — 



Pages. 



Potameis 173 



elegans 173 



minor 174 



Rhithrogena 82 



Ussingi 82 



Rhithrogeninœ . 82 



Siphlurinœ 162 



Siphlurus 162 



asstivalis 163 



latus . 167 



Zetterstedti 167 



sp.? 168 



Torleya * 131 



belgica 132 



