1848.] Linnean Society. 389 



4. Nemoura {Brachi/ptera) glacialis {Barnstun MS'S.). Mas satui'ate 

 brunneus fere niger, thoracis margine anteriore recto, alis ante- 

 rioribus triangularibus rudimentalibus segmentum abdominale pri- 

 mum tantum attingentibus ; posterioribus albidis longissiniis acutis 

 emarcidis decussatis, antennis elongatis pubescentibus o3-56-articu- 

 latis, pedibus longis compressis cursoriis; paris postremi longissimiy, 

 abdominis segmento terminali lato piano pubescente. 



Fcemina multo major, in veliquis tamen similis, capita paulnlum excavato, 

 alis amplis obscure brunneis nigro-nervosis. — Long. unc. ^. 



Hob. in Canada, ad Albany River. 



No. XXXVII. — Proceedings of the Linxean Society. 



