Palearctic Nemoure. 563 
faintly rugose. Abdomen blackish. Legs: femora above, ends: of 
tibiz, and the tarsi all fuscous. Wings greyish in some lights, but 
almost hyaline, highly iridescent, only very faintly clouded in the 
pterostigmatic region and about the x nervures; neuration 
generally blackish and distinct; the 4th apical cellule rarely 
biangulate at the base; in the posterior wings the superior 
cubitus usually leaves the radius at a considerable distance from 
the basal cell. In the g¢ the median prolongation of the ventral 
plate is comparatively short; the lateral appendages are broad at 
the base, contracted in the middle, with a large head, upturned, 
and acute at the apex externally, and possessing an eye-like 
tubercle ; the distal part of the appendage being very suggestive 
of a bird’s head. Exp., ¢, 174-18 mm.; 9, 22 mm. 
A species easily recognized by the appendages of the 
8, the very black coloration of the body and the highly 
iridescent nearly hyaline wings, which have hardly any 
darker cloudings. With regard to the lateral appen- 
dages, while there appears to be a slight amount of 
variation due to changes in drying, they ordinarily retain 
their character. The chance of confusion most exists 
with regard to the next species, but the notes and figures 
will, I hope, prevent error so far as the ¢ is concerned. 
According to our present British information, this 
species seems to be exclusively lacustrine in habit, and 
has been found in April and May at many of the lochs 
in the highlands of Scotland (King and Morton). It is 
a!lsoin Mr. McLachlan’s collection from the Hnglish Lake 
District. Outside Britain it has been seen from Finland ; 
the collection of the Helsingfors Museum contains 
examples from several localities. 
This species has apparently already been recognized 
in this country, but associated hitherto with one of 
Pictet’s names, a view I cannot in the meantime accept. 
The insect is as yet only kuown as an inhabitant of 
Northern Europe. 
Nemoura cambrica. 
N. cambrica, Stephens, Illustrations, p. 143 (?). 
N. pallicornis and nitida, ibid., p. 148 (7). 
Head and thoracic segments shining blackish. Antenne 
brownish or black. Pronotum nearly as broad as head, with pale 
lateral margins which recede slightly posteriorly. Legs usually 
yellowish, darker on the femora above and on the tarsi, Wings 
