558 Mr. Kenneth J. Morton on 
co-operation of the following entomologists :—Mr. 
McLachlan kindly lent me all his Palearctic Nemoure, 
numbering several hundreds, from all parts of the 
region, and including the results of his own collecting in 
Savoy, Switzerland, Burgundy, Dauphiné, the Pyrénées 
Orientales, Belgium, etc., Haton’s in Portugal, Zeller’s 
in Carinthia and elsewhere, and Fedchenko’s in Turke- 
stan; Dr. Fr. Ris, now of Rheinan, had the goodness 
to forward his whole collection of Swiss Nemoure, 
an extensive series in perfect condition; Mr. King, of 
Glasgow, supported me with much additional British 
material; Professor Klapalek, of Prague, sent me many 
useful insects; and Dr. John Sahlberg forwarded a 
choice collection of boreal and arctic Perlide, containing 
between three and four hundred examples belonging to 
the Helsingfors Musenm. I have thus had abundant 
material to work from; the apparently inadequate results 
are due to the small proportion of males and the fact 
that isolated females are in many cases practically 
indeterminable. 
At an early stage of my studies the nomenclature was 
seen to be in a hopeless tangle. No clear conception 
existed with regard to the limits of the species; the 
same species was known by several names according to 
the interpretation put upon existing descriptions by 
different entomologists; examples of the same species 
might be seen doing duty as exponents of two or more 
species in the same collection, or the reverse condition 
might obtain, two good species standing under one name. 
J am not sure that I have done any satisfactory work in 
clearing up the synonymy. Through the courtesy of 
M. Frey-Gessner, I have had the opportunity of ex- 
amining the Nemourx of the Geneva Museum, which 
contains what remains of the “ types” of the two Pictets. 
It appears, however, that the collection now contains 
very few examples which can properly be called “‘ types,” 
as the old collection of the elder Pictet was greatly 
destroyed by Anthrenus. Mons. A. Edouard Pictet con- 
tinued the collection, and added to it, and the whole, 
after his death, came into possession of the Geneva 
Museum. A few years ago, Mr. Albarda determined the 
Perlide ; and the Nemoure, as I understand, now repre- 
sent little more than the views of that author. As is 
usual in collections of these insects, females predominate, 
