126 Rev. A. E. Eaton on 
The synonymy of species collated from foreign aiTtliors 
may be taken at what it may be Avorth. AVithout insjiec- 
tion of t}^5e-specimens it is impossible to arrive at decisions 
absolutely ti-ustworthy respecting the species to which de- 
scriptions were intended to apply. All other identifications 
(since no figures of appendices have been published hitherto) 
are mere tentative conjectures more or less probable. Still, 
where they cannot be disproved, there is no reason why 
they should not be accepted. However, it is Avell not to 
attach much importance to them. At the least they may 
be regarded as indications of the occurrence abroad of 
species very nearly related to our native forms. Some of 
the British species have a Avide range, being foimd even in 
Italy. It is possible, therefore, that Pictet's and Kolenati's 
species really occur in Great Britain. And, therefore, 
though unable to affirm this to be the case, I admit the 
identifications which have been set forth by previous 
Avorkers in hope that they may be verified ; but I do not 
give localities for species (without my having seen speci- 
mens from them) on the strength of these provisional iden- 
tifications. 
In Dr. Hagen's " Phryganidarum Synopsis Synonymica" 
a complete index to the literature published before the year 
1864 relating to the family already exists. Up to that 
date I shall therefore give merely an enumeration of the 
authors Avitli references to figures only. The places of 
descriptions may be ascertained from the subjoined list of 
publications. Since 1864, very little has been published 
about the Htjdroptilidai, and, in consequence, few addi- 
tions require to be made to Dr. Hagen's index ; such as 
there are I give in detail. There are some changes in the 
synonymy Avhich I have adopted from jNlr. JNl'Lachlan's 
'• jNIonograph of the British Trichoptera ;" for others I am 
myself res]ionsible. 
In the following list of publications the names originated 
by authors are given after the titles of the Avorks in Avliich 
they were first published : — 
A Chronological List of Publications relating to the 
llgdroptilidcc. 
1819 (Dalm. Vet. Acad. Hand!.) J. W. Dalnian : in K. Vctcnskaps 
Academiens Ilaudlingar, i. 125 — 7, tab. vi. 1 — 4. IlydropiUa 
tinea ides. 
IS'2" (Dalm. An. Ent.) J. ^V. Dnlnian : Analccta Entomolnjiica, ])p. 20-7, 
tab. iii. 1 — 4. [Kcprintcd I'roiu bis previous paper, witb a few 
verbal alterations.] 
