18C7.] 179 
obtained from a careful examination of the types. With regard to 
Latreille's species, a careful study of his descriptions (aided by the 
figures), has, in one or two instances, induced me to arrive at a different 
conclusion to that of Hagen. I have not thought it necessary to notice 
mere catalogue names, such as those of Stephens' "Catalogue" and 
" Nomenclature," and Curtis' " Guide." Neither, as a rule, have I 
referred to Walker's British Museum Catalogue {Neuroptera, part 3), 
because the diagnoses there given are copies from other authors, and 
the species placed to represent them in the general collection of the 
British Museum have, in many cases, nothing whatever to do with the 
names accompanying them. 
I enumerate 29 species ; but many more, no doubt, occur with us. 
It may be remarked, that almost all the described European species have 
been found here. Apterous or semi-apterous forms of the division 
Afropina are very liable to be introduced and become naturalised ; and 
even some of the true Psocina are likely to obtain a footing in the same 
way, for I once saw a species swarming in the empty hold of a foreign- 
going ship. 
As a rule I have not mentioned special localities ; these insects 
have been so little collected, that an enumeration here of known or 
recorded localities would probably appear ridiculous in a few years. 
Excepting for the apterous or semi-apterous forms I prefer pinning 
to mounting on card ; save my own, all recent collections of these in- 
sects that I have seen are carded, but these are not so easy to examine, 
especially as regards the neuration, which can only be well seen by 
holding the wings against the light ; besides, carded specimens are very 
liable to be attacked and destroyed by mites and Atropos. 
It only remains for me to say that I hope this monograph may in- 
duce observers to turn tlieir attention to these insects. The materials 
I have had to work from have been limited. StejDhens' collection, as 
aifording the only reliable guide to a correct knowledge of his species, 
has been constantly consulted, and my own collection contains most of 
our forms. To Professor Westwood I am greatly indebted, he having 
placed in my hands the materials in the Oxford Museum, and his own 
drawings of the obscure Atropina ; Mr. J. C. Dale has sent me more 
than a hundred examples taken at various times during his long career ; 
and the Eev. T. A. Marshall has also communicated the whole of his 
materials in this family. To these gentlemen I herewith acknowledge 
my obligations. 
The Psocidce may be arranged in two divisions, thus — 
A. Ocelli absent. Wings ill-developed or absent Atropina. 
B. Ocelli present. Wings largely developed' Psocina. 
