Mage [Ixxvi 
November 2nd, 1904. 
The Presipent exhibited a photograph taken by his assistant, 
Mr. A. H. Hamm of the Hope Department, Oxford, and 
communicated the following note, in which Mr. Hamm records 
his observation :— 
“On the evening of the 8th of August last while looking 
over some Cactus Dahlias growing in my garden, I founda ¢ 
Pieris rape at rest on the petals of a pure white variety, and 
immediately photographed it iv situ, as shown in the print 
exhibited. 
“ Again, on September Ist, in the evening, another ¢ of the 
same species was found at rest in an almost identical position 
on the same plant. 
“ And for the third time, on October 8th, yet another ¢ of 
P. rape was found at rest in a similar position on the same 
plant. The day succeeding October 8th was dull and chilly, 
and the butterfly remained without moving the whole day. 
In the evening of the 9th it was in exactly the same position 
as that occupied on the evening of the 8th. 
«J had in all some thirty plants of Cactus Dablias varying 
in colour from very dark purple-red to red, pink, mauve, orange 
and yellow ; but only two plants which were pure white. On 
no single occasion did I observe P. rapx at rest on any other 
flower or plant than the one mentioned. 
“This, I think, is very significant and emphasizes the fact 
that some insects do discriminate between colours in choosing 
a resting site, and that in the direction of protective resem- 
blance. Otherwise why should P. vapz on each occasion have 
chosen the white flower in preference to those of other colours 
in such close proximity ?” 
Dr. T. A. CHAPMAN mentioned that he had once followed 
a specimen of Colias edusa for a considerable distance, and 
observed that it invariably came to rest upon a yellow leaf. 
The PresIpEntT also exhibited four specimens of Conorrhinus 
megistus, Burm., a large South American Reduviid of a genus 
which is well known to attack man. These four examples 
were a few out of over three dozen brought back by W. J. 
Burchell, and the notes upon them are an interesting record 
