ILLUSTRATIVE OF NATURAL SELECTION. 173 
All these belong to the family of the Nymphalide. 
Many other’ genera of this family, as Diadema, Adolias, 
Charaxes, and Cyrestis, as well as the entire families 
of the Danaide, Satyride, Lycsenide, and Hesperide, 
present no examples of this peculiar form of the upper 
wing in the Celebesian species. 
Local variations of Colour.—In Amboyna and Ceram - 
the female of the large and handsome Ornithoptera 
Helena has the large patch on the hind wings con- 
stantly of a pale dull ochre or buff colour, while in 
the scarcely distinguishable varieties from the adjacent 
islands of Bouru and New Guinea, it is of a golden 
yellow, hardly inferior in brilliancy to its colour in 
the male sex. The female of Ornithoptera Priamus 
(inhabiting Amboyna and Ceram exclusively) is of a 
pale dusky brown tint, while in all the allied species the 
same sex is nearly black with contrasted white mark- 
ings. As a third example, the female of Papilio Ulysses 
has the blue colour obscured by dull and dusky tints, 
while in the closely allied species from the surrounding 
islands, the females are of almost as brilliant an azure 
blue as the males. A parallel case to this is the occur- 
rence, in the small islands of Goram, Matabello, Ké, 
and Aru, of several distinct species of Euplaea and 
Diadema, having broad bands or patches of white, 
which do not exist in any of the allied species from 
the larger islands. These facts seem to indicate some 
local influence in modifying colour, as unintelligible 
and almost as remarkable as that which has resulted 
in the modifications of form previously described, 
