( Vi ) 
A narrow partition of perforated zinc, as in the one 
executed by Messrs. Watkins and Doncaster, may be fixed at 
one end of each trough, to contain a bag of naphthalin ; the 
lids hinged, and fastened with a spring clasp. 
Mr. Green in his letter commiTnicating the above said that 
he had found that envelopes stored in this way occupy very 
much less space than if placed haphazard in a plain box, and 
that the insects are less liable to damage. The ease with 
Avhich any individual specimen can be found instantly is a 
convenience that cannot he overestimated. He had over 6000 
butterflies stored in this manner, the collection occupying only 
a dozen of these small boxes which, being of uniform size, can 
be stacked in quite a limited space. 
Discussion of the Affinities of Agriades thbtis 
(bellargus) and a. coridon. 
The discussion of the affinities of Agriades thetis {bellargus) 
and A. coridon, adjourned from the December meeting, was 
resumed by Mr. J. W. Tutt, who exhibited five cabinet drawers 
of the two species demonstrating in particular the several 
forms of A. coridon as occurring in the Palaearctic region. He 
pointed out in some detail the nearness of the two Agriadid 
species in the structure of their eggs, larvae, pupae, imagines, 
especially noting in the latter case the similarity in the $ 
genitalia. Observing that it had generally been assumed that 
closely-allied species had been maintained if not developed by 
the setting up of some ellective boundary in their environ¬ 
ment or morphological structure, resulting in isolation, it was 
remarkable that no such boundaries could be found in these 
species. Not only was their environment similar, their 
morphological structure almost identical, but their actual 
range * was practically the same. 
The facts of their distribution appeared capable of tabulation 
as follows:— 
Mr. Betliune-Baker has two undoubted S A. coridon in his collection 
sent from America, and supposed to come from Arizona. The species is 
not known otherwise as American, the two examples have a quite European 
facies, and the discontinuous distribution involved in the supposition that 
they are N. American is very remarkable. We suspect some error. 
