ILLUSTRATIVE OF NATURAL SELECTION. 171 
condly, in the costa or anterior margin being much 
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 Moluccas 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 sur- 
wings falcate or with abruptly rounding islands, with less falcate 
curved costa, wings and slightly curved costa. 
1. P.Gigon ... a. «. P. Demolion (Java). 
2. P. Pamphylus_... «. P. Jason (Sumatra). 
3. P. Milon ... sae .. P. Sarpedon (Moluccas, Java). 
4, P. Agamemnon, var. .., P. Agamemnon, var. (Borneo). 
5. P. Adamantius ... «. P. Peranthus (Java). 
6. P. Ascalaphus  ... ... P. Deiphontes (Gilolo). 
7. P. Sataspes oes .. P. Helenus (Java). 
8. P. Blumei... saa ... DP. Brama (Sumatra). 
9. P. Androcles... .. P. Antiphates (Borneo). 
10. P. Rhesus... aes .. P. Aristzus (Moluccas). 
11. P. Theseus, var. (male) ... P. Thesus (male) (Java). 
12. P. Codrus, var. ... ... P. Codrus (Moluccas). 
13. P. Encelades... «. P. Leucothoé (Malacca). 
It thus appears that every species of Papilio exhibits 
this peculiar form ina greater or less degree, except 
one, P. Polyphontes, allied to P. Diphilus of India 
