Palearctic Nemoure. 571 
Nemoura cinerea. 
N. cinerea, Olivier, Enc. Méth., viii., p. 186, No. 2 (?). 
N. cinerea, Pictet, Perlides, p. 401 (?). 
N. sulcicollis and N. fwmosa, Stephens, Illustra- 
tions, p. 143. 
Shining, black with concolorous antenne. Pronotum usually 
distinctly transverse, about as broad as head, lateral margins 
straight without definite borders. Legs brownish. Wings grey, 
nearly hyaline, but sometimes smoky, with fuscous neuration, 
which is nearly black and usually very strong about the x nervures 
and pterostigma. In the ¢ the median prolongation of the 
ventral plate is of unusual length, and the ventral lobe is long and 
narrow ; there is present a pair of very strong upturned usually 
blackish sheaths which appear to be obtuse at the apex. Exp., 
11-155 mm. 
This species I have found very common in June and 
July at all the Scotch streams where I have collected. 
I have received from Klapdlek both sexes, these 
Bohemian examples having the neuration less distinct 
than in most British specimens. Only one rather doubt- 
ful ¢ example was in Dr. Ris’ collection, but the species 
probably occurs commonly in some parts of Switzerland. 
Examples in Mr. McLachlan’s collection from several 
countries are referred by me to this species: France 
(Autun and the Vosges), Switzerland (Hngadine), and 
Schwarzwald ; probably, also, Portugal  (Haton), and 
Carinthia (Zeller). 
Professor Klapalek considers this species to be Pictet’s 
N. cinerea, and | am inclined to agree with him, although 
the view has been considered by some as doubtful. 
Whether it is Olivier’s cinerea is a point which may be 
questioned with more reason. The species is very 
variable, and I think Stephens’ two species above- 
mentioned are certainly forms of it. 
Nemoura borealis, n. sp. 
Head dark shining brown, antennz usually paler. Pronotum 
brownish, sub-quadrate, narrower than the head. Legs testaceous, 
almost without darker markings. Wings pale, subhyaline, with 
very pale neuration. In the ¢ the ventral lobe or lamina is rather 
narrow and elongate ; appendages rather broad at the base, tapering, 
twisted in the dry insect, expanding towards the somewhat flat- 
