Palzarctic Nemoure. 559 
and it is not easy to speak of right and wrong with 
regard to them; but as there is certainly error in con- 
nection with the placing of some of the males, I have 
been driven, in a great degree, to adopt my own views 
about Pictet’s species. There may be differences of 
opinion regarding my conclusions, but I trust the notes 
and figures given will make easy the identification of the 
species to which I have applied Pictet’s names, and will 
also, in some degree at least, prevent a recurrence of the 
confusion alluded to at the beginning of this paragraph. 
Stephens’ types are much more satisfactory than those 
of Pictet. They are, for the most part, in good condi- 
tion and serviceable ; the drawback in connection with 
them is the one common to collections of Nemowre 
already alluded to, namely, the undue proportion of 
females. My conclusions regarding these types will be 
referred to in the synonymic references preceding, or the 
notes following, the descriptions of the species. I have 
to express my indebtedness to Mr. Chas. O. Waterhouse, 
of the British Museum, for enabling me to examine 
Stephens’ Perlide. 
Before giving the descriptive and other notes on the 
species, it may be well to say a few words regarding the 
characters of Nemoura. The geuus was established by 
Latreille in 1796. Pictet adopted the term to cover his 
three sub-genera, Txniopteryx, Leuctra, and Nemoura. 
These three divisions are now generally regarded as 
separate genera, and the species to be dealt with here 
are those falling under Nemowra proper. 
The following are Pictet’s diagnoses of the three 
genera (very slightly modified) :— 
TENIOPTERYX. 
(Nervures of pterostigma not forming a x.) 
Labial palpi moderate and separated. Abdomen terminated by 
short sets. Three tarsal joints long and nearly equal, Wings in 
rest half cylindrical. 
LructTra. 
(Nervures of pterostigma not forming a y.) 
No caudal setee. Labial palpi very short. Tarsi with 2nd joint 
short, 1st and 3rd long. Wings in rest half cylindrical. 
