388 Linnean Society. [June 20, 



by Mr. Barnston in Canada, and now in the British Museum, and the 

 habits of the species were detailed as observed by that gentleman. 



The generic characters of Pteronarcys were proposed to be revised • 

 as follows : — 



Pteronarcys, Newm. 



Char. Gen. Segmenta thoracica etiam in Imagine branchiis externis 

 piasdita. ^Ice magnae, i-eticulatae. Palpi maxillares labialibus multo 

 longioves, 5-ai"ticulati ; articulis 2 basalibus brevibus, reliquis elongatis, 

 extei-ne dilatatis. Mandibules parva?, obtusze. Segmentum abdominale 

 octavum in mari processu longo ventiali muni turn, in foemina paul6 

 evolutum vel bifidum. 



Mr. Newport added the following new species : — 



Pteronarcys Californicus $ ; capite thoraceque saturate bninneis, 

 fronte clypeo labroque rufis, oculis ocellisque nigris, segmentis thora- 

 cicls linea longitudinali interrupta flava, abdomine aui-antiaco lateribus 

 brunneis, stylis caudalibus basi flavis, antennis pedibusque totis atris, 

 alis obscuris nigro-nervosis sed absque macula stigmali. 



Hab. in California (Z). Hartweg). 



The following apparently new species of Canadian Perlidce were 

 described, with remarks on the habits of each as observed by Mr. 

 Barnston. 



1. Perla ciTRONELLA (BamstoH MSS.) ; saturate flava, antennarum 

 articulis 33-35, oculis ocellisque brunneis, alis hyalinis pallide luteis 

 margine costab flavis, abdominis dorso brunneo. — Long. lin. 3-3^. 



Jlab. in Canada, ad Albany River, latit. 54°. 



2. Perla minima (Barnston MSS.) ; nigra nitida, antennarum articulis 

 circa 26 submoniliformibus pilosis, fronte 'paululum excavato, palpis 

 subclavatis, tborace angusto subquadrato, stylis caudalibus 13-articu- 

 latis, alis obscuris nigro-nervosis in mari brevibus obtusis abdomen 

 semicooperientibus in foemina amplis corpore longioribus. — Long, 

 lin. lf-2. 



Hab. in Canada, ad Albany River. 



3. Capnia vernalis, Newp. ; nigra nitida pilosa, tborace postice rotun- 

 dato, antennarum articulis 30-33 pubescentibus, alis obscuris pilosius- 

 culis nervis magnis nigris, stylis caudalibus subulatis 21-23-articulatis. 

 — Long. lin. 2^. 



Perla vernalis, Barnston MSS. 

 Hab. in Canada, ad Albany River. 



The fourth species, distinguished from most other Nemource by the 

 short anterior wings of the male, the author proposed to join with 

 Nemoura trifasciata, Pictet, which is similarly formed, in a subgenus 

 for which he proposed the name Brachyptera,^ 



