(Cxsaxi0e 8) 
summer upon the struggle for existence in pupe, very large 
numbers of pup of Vanessa urtice were produced upon back- 
grounds of various colours, with results which confirmed 
the conclusions he had already recorded. He hoped soon to 
bring a detailed account of these observations upon pupal 
colour-adaptation before the Society. 
Replying to Mr. Bateson’s objections to the interpretation 
of the colour-susceptibility of the pup of Pieris napi as of 
protective value, he considered that it was in every way 
probable that the larvee wandered before pupation (as those 
of allied species were known to do) and that their power of 
becoming green was of value when they were fixed to grasses 
or other plants which remain green through the winter. 
Even if all such green surfaces were covered up with snow in 
the more northern part of the range of the species, this would 
not be the case for the whole of the winter pupal period, nor 
would it hold good for other parts of the range. As to the 
objection that the results obtained with bred pup were not 
invariably consistent, in his experience the more completely 
the experiment was conducted with this sole object in view, 
the more uniform and convincing was the result. 
Furthermore, the conditions of even the most carefully 
conducted experiments differed in many respects from those 
which obtained in nature. The proof required by those who 
objected to an interpretation based on natural selection was 
the discovery in natwre of the exceptions noted in their 
experiments—that of light green pupe of P. napi or P. rape 
or the golden or green pup of Vanesse upon grey stone, or 
the dark forms of all these upon leaves. 
Although some of these pup had been often observed in 
one or both situations he had not heard of any single ex- 
ception to the rule; and if they occurred they must be 
excessively rare. 
Mr. G. H. Verraty read a paper on “Syrphide collected 
by Colonel Yerbury at Aden,” the specimens being exhibited 
by Colonel Yerbury. 
Papers were communicated by Mr. G. C. CHAMPION on 
“The Clavicorn Coleoptera of St. Vincent, Grenada, and the 
Grenadines,’ based on the determinations of M. Grouvelle ; 
and by the Rev. T. A. MarsHatt on “ The British Braconide, 
edema Aa Ml TA 
