lvi] ae, 
in the latter case did not appear to have retarded the emergence. 
But the aspect of the third row of specimens—those which had 
been subjected to excessive dryness—was widely different from 
that of the rest. Here, as shown by Major Manders’ photograph, 
the macule were almost entirely absent ; and the butterflies, 
or at all events the females, were of the form usually known 
as pyranthe. In spite of the small numbers concerned, it could 
hardly be doubted that this difference was significant ; and 
the main result appeared, therefore, to be that while neither 
moisture nor cooling produced any alteration in the appearance 
of the ordinary wet-season form, the exposure of larvze belong- 
ing to the same form to an artificially dehydrated atmosphere 
did cause them to assume the garb that was generally charac- 
teristic of the dry months of the year. It was to be hoped 
that the experiments might be repeated with larger numbers. 
A point that seemed to require some explanation was that 
whereas the author of the present paper had no doubt that 
the specimens of C. pyranthe reared under conditions of 
drought were of the form that was commonest in the dry 
season, the late Mr. de Nicéville, on the other hand, spoke 
of the dry-season form as C. gnoma. It was perhaps possible 
that Mr. de Nicéville considered Fabricius’s original description 
of C. gnoma, which mentions only one spot on the under- 
surface of the hind-wings, inapplicable to the heavily maculated 
phase recognized as gnoma by Moore (Lep. Ceylon, vol. i, 1880, 
p. 123), and by most other writers. 
October 5th, 1904, 
Dr. F. A. Dixry exhibited some preparations of the scent 
of male Pierine butterflies, and read the following note :— 
“It has long been known that the male Ganoris (Pieris) 
napi emits a scent like that of lemon verbena. The fact is 
mentioned by Standfuss in his ‘ Handbuch,’ and by Barrett in 
his ‘ British Lepidoptera.’ The latter authority also remarks 
that the male of Colias hyale is said to have a smell like that 
of pineapple. In connection with work on the secondary 
sexual characters of the Pierines I have been attempting 
