XCVil, ¢, ci] 5s) 
had exercised a strong influence on this group of Belenois, and 
that in the progress of these Lelenois-forms towards the 
final mimetic pattern shown by JP. thysa, one of them had, as 
it were, taken up 7”. regina in its course. The association 
between the Belenots and the Teracolus was probably Miillerian, 
the Lelenois being in most respects the model; but it was 
perhaps not improbable that the Zeracolus had to some extent 
influenced the Belenois. These specimens seemed to favour the 
view that B.thysa was a Millerian rather than a Batesian mimic. 
It was an interesting fact that the cryptic character of the dry- 
season form, as well as the mimetic appearance of the wet-season 
phase of the Zeracolus, was confined to the under surface ; 
being presumably in both instances intended for use during 
rest rather than in flight. As in other cases, the dry-season 
form was probably the more efficiently protected. It might be 
taken as a general rule that in cases of seasonal dimorphism, 
if one phase only were protected, that phase would be the 
dry-season one; if both adopted means of defence differing in 
degree or in kind, the dry-season phase would be the better 
protected of the two. 
Professor E. B. Poutton, F.R.S., communicated some 
‘‘further notes on the choice of a resting site by Pieris 
rape, by Mr, A. H. Hamm, as follows :— 
‘On July 10th this year I observed a male of this species 
at rest on the under-side of a dahlia leaf in my garden, 22 
Southfield Road, Oxford. In no case had the dahlias bloomed 
by this date. The Pieris, although it had not chosen the best 
possible site in the garden, was fairly well hidden amid the 
thick foliage. The only other occasion on which this species 
was seen at rest in 1906 was on August 4th, when my friends, 
Mr. Holdaway and Mr. Constance, and I were sugaring in the 
“ Decoy,’ Newton Abbot, S. Devon. During the rounds 
many trees, bushes, &c. were searched with the aid of our 
lanterns for any strange insects at rest upon the foliage. My 
attention was first directed by Mr. Constance to a specimen of 
P. rapx at rest upon the whitish under-side of a leaf of the 
broad-leaved sallow (probably Salix caprxa). After this we 
all three began a more systematic search, and succeeded in 
finding four additional individuals of the species. The five 
