Affinities of Pteronarcys regalis. : 451 
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 VERNALIS, nigra nitida pilosa, thorace posticé rotundato, antennarum articulis 
30-33 pubescentibus, alis obscuris pilosiusculis nervis magnis nigris, stylis caudalibus 
subulatis 21—23-articulatis.— Long. lin. 21. 
Perla vernalis, Barnston MSS. 
Hab. in Canadá, 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 Pygme, 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 (BnacnyPTERA) GLACIALIS (Barnston MSS.). 
Mas saturatè brunneus ferè niger, thoracis margine anteriore recto, alis anterioribus tri- 
angularibus rudimentalibus segmentum abdominale primum tantùm attingentibus ; 
posterioribus albidis longissimis acutis emarcidis decussatis, antennis elongatis pos 
centibus 53-56-articulatis, pedibus longis compressis cursoriis; paris postremi lon- 
gissimis, abdominis segmento terminali lato plano pubescente. 
Femina multi major, in reliquis tamen similis, capite paululüm excavato, alis amplis ob- 
scuré brunneis nigro-nervosis.— Long. unc. 1. 
Hab. in Canadá, ad Albany River. 
This insect differs from the European species, Nemoura trifasciata, dei: 
in the wings of the females being entirely brown, and also the legs; aum in, 
the straight margin to the prothorax. Like that species, z 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 
