Dire Mr. Kenneth J. Morton on 
tened apex, the margins of which are deeply serrate. Exp., about 
15 mm.in g ; the 9 larger. 
So far as the material examined shows, this is a small, 
pale, rather delicate-looking insect, but it is absolutely 
devoid of any striking outward character, The appen- 
dages, however, are very unlike those of any other 
species. 
I have seen it from several Finnish localities, and I 
believe Mr. McLachlan has it from Lapland. 
Nemoura inconspicua. 
N. inconspicua, Pictet, Mém. Soc. Phys., tom. vii., 
p. 185, No. 12 (?). 
N. inconspicua, Pictet, Perlides, p. 404, pl. lin. (?). 
N. pallipes, Steph., Illustr., p. 142 (?). 
N. pallicornis, Steph., Illustr., p. 145 (?). 
N. xitida, Steph., Hlustr., p. 143 (?). 
Shining blackish or brown, prothorax as broad as head with pale 
broad borders and receding lateral margins. Legs yellowish, femora 
hardly marked, tibiae with dark tips, and apical joints of tarsi also 
darker. Wings pale, nearly hyaline, with faint light brown 
neuration. Inthe ¢ the genitala are very prominent, and consist 
principally of two large subcylindrical upper yellowish lobes, and 
a pair of very long slender upturned yellow sheaths. Lobe of 
ventral plate long. Exp., g 13-15} mm., 9 17-18 mm. 
One of the most easily determined of the Perlide, 
Its generally pale colours and the prominent’ genitalia 
in the d separate it from all its congeners. In Scot- 
land I have taken it sparingly in July and August; it is 
attached to smaller streams and to springs. It is well 
represented in the Swiss collection of Dr. Ris. Mr. 
McLachlan has taken it at Chamounix in July. 
This species agrees with Pictet’s description as far as 
that goes. I think, however, it is more than likely that 
Pictet’s species was really a combination of minute forms 
belonging to more than one species, Stephens’ species, 
above alluded to, are probably large females of this 
insect. 
The insects noticed in the preceding pages almost 
certainly represent but a small proportion of the species 
which exist in the Palzarctic region. In addition to 
many females which must remain doubtful, including two 
in Mr. Mclhachlan’s collection from Algeria (Haton), 
