Contributions to the theory of natural selection. A series of essays ... By Alfred Russel Wallace ...

ILLUSTRATIVE OF NATURAL SELECTION. 171
condly, in the costa or anterior margin being imuch
more curved, and in most instances exhibiting near
the base an abrupt bend or elbow, which in some
species is very conspicuous. This peculiarity is visible,
not only when the Celebesian species are compared
with their small-sized allies of Java and Borneo, but
also, and in an almost equal degree, when the large
forms of Amboyna and the M3oluccas are the objects
of comparison, showing that this is quite a distinct
phenomenon from the difference of size which has just
been pointed out.
In the following Table I have arranged the chief
Papilios of Celebes in the order in which they exhibit
this characteristic form most prominently.
Papilios of Celebes, having the Closely allied Papilios of the surwings falcate or with abruptly rounding islands, with less falcate
curved costa. wings and slightly curved costa.
1. P. Gigon...... P. Demolion (Java).
2. P. Pamphylus... P. Jason (Sumatra).
3. P. Milon... P. Sarpedon (M3oluccas, Java).
4. P. Agamemnon, varl.. Agamemnon, var. (Borneo).
5. P. Adamantius...... P. Peranthus (Java).
6. P. Ascalaphus..... P. Deiphontes (Gilolo).
7. P. Sataspes..... P. Helenus (Java).
8. P. Blumei......... P. Brama (Sumatra).
9. P. Androcles...... P. Antiplhates (Borneo).
10. P. Rhesus........ P. Aristaeus (Moluccas).
11. P. Theseus, var. (male)... P. Thesus (male) (Java).
12. P. Codrus, var....... P. Codrus (Moluccas).
13. P. Encelades...... P. Leucotho6 (Malacca).
It thus appears that every species of Papilio exhibits
this peculiar form in a greater or less degree, except
one, P. Polyphontes, allied to P. Diphilus of India