Affinities of Pteronarcys regalis. 45 1 



The pupa is of a light brown colour. "The perfect insect retreats when 

 out of the water to the cracked fissures of decayed trees. This is the habit 

 of most of the species. They shun the light. This insect appears early in 

 April. The wings of the male are twisted, and cover only half of the ab- 

 domen." 



3. Capnia vkbnalis, nigra nitida pilosa, thorace postice rotundato, antennarum articulis 

 30-33 pubescentibus, alis obscuris pilosiusculis nervis magnis nigris, stylis caudalibus 

 STibulatis 21-23-articulatis. — Long. lin. 2i. 



Perla vernalis, Barnston MSB. 



Hab. in Canada, ad Albany River. 



Male smaller and more intensely black than the female. This is a minute 

 species, with the general aspect of Sialis. It resembles Capnia Pygmce, Pictet, 

 which inhabits Pennsylvania and Newfoundland, and perhaps is that species. 

 Mr. Barnston says, "The nymph comes up frequently in the cracks of the 

 ice, and casts its spoil there. It comes up when the thermometer stands at 

 freezing." 



The next is an entirely new species, and together with an European one, 

 Nemoura trifasciata, Pictet, may form a subgenus, which I propose to desig- 

 nate Brachyptera, from the short anterior wings of the males. 



Nemoura (Brachyptera) glacialis {Barnston MSS.). 



Mas saturate brunneus fere niger, thoracis margine anteriore recto, alis anterioribus tri- 

 angularibus rudimentalibus segmentum abdominale primum tantum attingentibus ; 

 posterioribus albidis longissimis acutis emarcidis decussatis, antennis elongatis pubes- 

 centibus 53-56-articulatis, pedibus longis compressis cursoriis; paris postremi lon- 

 gissimis, abdominis segmento terminali lato piano pubescente. 



Foemina multo major, in reliquis tamen similis, capite paululum excavato, alis amplis ob- 

 scure brunneis nigro-nervosls. — Long. unc. |. 



Hab. in Canada, ad Albany River. 



This insect differs from the European species, Nemoura trifasciata, Pictet, 

 in the wings of the females being entirely brown, and also the legs ; and in 

 the straight margin to the prothorax. Like that species, " It appears in the 

 spring (end of March or beginning of April), when the ice becomes honey- 

 combed, and even before then, at the same time as the preceding species 



