2 
“staging” the specimens, printing, labelling, and arranging. 
How great this is likely to be may be to some extent inferred 
from the number of the specimens. 
Among the African accessions a deep and special interest 
belongs to the specimens of that remarkable mimetic “ Swallow- 
tail” — Papilio dardanus form cenea, bred and presented by 
Mr. G. F. Leigh, of Durban. As long ago as 1870 Mr. Roland 
Trimen, F.R.S., F.E.S., brought convincing evidence that a 
butterfly, of which the male had been described as one species 
and the different forms of the female as three other species, 
was in reality but a single species with a non-mimetic male 
and three forms of mimetic females, each resembling a different 
model. Professor Westwood, who himself described one of 
these females as Papilio trophonius, at first doubted the inter- 
pretation, but he was ultimately convinced, and the present 
Professor well remembers the delight of the great naturalist 
when he showed and explained the fine series of forms of the 
female in the Hope Museum, all bred from the larvae found 
in the same garden in King William’s Town, South Africa, by 
Mr. J. W. Mansel Weale. But the conclusive test of breeding 
from a single pair of parents had never been applied until 
Mr. Leigh undertook the work at Durban in 1902 and 1903. 
The commonest form of female of this species in Natal (cexea) 
may be called A, the rare form (Aippocoonoides) B, the rarest 
form (trophonius) C. Mr. Leigh captured (Sept. 18, 1902) 
a male 2 coztw with form A. From the eggs he succeeded 
in rearing 18 males, 24 A-females, and 3 B-females. A year 
later he captured form C, and from its eggs reared 3 males and 
2 A-females. Finally, during the past year Mr. Leigh watched 
the oviposition of form C. He failed to catch the parent, but 
collected the eggs and bred from them 6 males, 5 A-females, 
and 1 C-female. The two earlier breeding experiments are 
described in Trans. Ent. Soc. Lond., 1904, pp. 677-91, 
Plate XXXI. Further details will be found in the later 
part of this Report; but this final conclusive justification of 
Mr. Trimen’s inferences of over thirty years back, is of such 
great importance and interest that it has been thought well 
