ILLUSTRATIVE OF' NATURAL SELECTION. Ill 



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 A.mboyna 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 P. Demotion (Java). 



2. P. Pamphylus P. Jason (Sumatra). 



3. P. Milon 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 P. Helenus (Java). 



8. P. Blumei P. Brama (Sumatra). 



9. P. Androcles P. Anfciphates (Borneo). 



10. P. Rhesus P. Aristseus (Moluccas). 



11. P. Theseus, var. (male) ... P. Thesus (male) (Java). 



12. P. Codrus, var P. Codrus (Moluccas). 



13. P. Encelades P. Leucothoe (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 



