133 
details of insect morphology have been more systematically 
worked out, the last-mentioned character may help us to 
come to some more positive conclusion, respecting the real 
affinities of this remarkable insect.’ Having a broken 
specimen, I made a microscopical examination of the wings, 
and sketched the various forms of scales. The curious bifid 
scales thinly cover the whole of the wing membrane, and 
for the most part, particularly towards the nervures, overlap 
the simple pointed forms; that these simple scales are only 
found towards the margin is therefore not correct. 
‘On the nervures the pointed form predominates. All 
the scales are finely striated, and under condensed light 
beautifully iridescent. 
‘““ Modifications of both forms of scales are present, but 
the bifid is the characteristic shape”’ (see Figs. 1 and 2). 
Mr. Turner exhibited specimens of Tephrosia crepuscularia, 
sent by Mr. Clarke, of Reading, and taken in the wood 
where Mrs. Bazett had stated that the species did not occur. 
They were captured March 22nd—2y4th of this year (see also 
p- 125). 
MAY 27th, 18097. 
Mr. R. ADKIN, F.E.S., President, in the Chair. 
Mr. Bainbridge Prest, of Sydenham, was elected a 
member. 
Mr. Auld exhibited the larvee of the two British species of 
Phorodesma, P. bajularia and P. smaragdaria, and remarked 
upon the very close similarity of the former in its covering 
of oak remnants to the groups of bursting buds and scales. 
Mr. H. Moore exhibited male and female specimens of a 
remarkable Pierid from Mexico, viz. Pyrisitia proterpia, of a 
very bright and rich orange colour. 
Mr. Tutt exhibited some specimens of Ascalaphus coccajus 
from the neighbourhood of Digne. He pointed out that the 
specimens exhibited two distinct aberrations in the yellow 
coloration, one being very pale, the other of a much brighter 
yellow. He was inclined to consider this difference, how- 
ever, as being due to a difference in development, the paler 
ones, which were all captured in the early morning, probably 
not having assumed the mature coloration. He had learned 
from Mr. R. McLachlan that there was a white or whitish 
aberration of the species, and further, that a near ally of this 
species, A. macaronius, was first described by Scopoli as a 
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