100 



THE GENESIS OF SPECIES. 



[CHAP. 



icked kinds have not had the wing modified. Such an ene- 

 my occasioning increased powers of flight, or rapidity in 



OUTLINES OP WINGS OF BUTTERFLIES OF CELEBES COMPARED WITH THOSE OF ALLIED 

 SPECIES ELSEWHERE. 



Outer outline, PapiUo gigon, of Celebes. Inner outline, P. demoUon, of Singapore 

 and Java. 2. Outer outline, P. miletw, of Celebes. Inner outline, P. sarpedon 

 India. 3. Outer outline, Tachyris sarinda, Celebes. Inner outline, T. nero. 



turning, he adds, " one would naturally suppose to be an 

 insectivorous bird ; but it is a remarkable fact that most of 

 the genera of fly-catchers of Borneo and Java on the one 



