606 Mr. J. C. Moulton on some American Butterflies. 



cross-belt and the spot at the hind angle of the fore- 

 wing having become of the same dark orange-brown 

 hue as the rest of the wing. The same transformation 

 of colour takes place in many species of Heliconidm in 

 travelling from east to west, and I am inclined to think 

 it is due to the direct action of the physical conditions 

 of the localities on the early states of the insects." 



M. madeira must be considered a south-eastern form of 

 M. pardalis, whose chief habitat is at Ega, on the Upper 

 Amazons. 



It should be observed that in this description two $ $ 

 of 3f. madeira were compared with two ^ ^ of 31. 'pardalis. 



My sincere thanks are due to Mr. R. Trimen, F.R.S., for 

 his kind help in the above description. 



Explanation of Plates XXX— XXXIV. 



[/See Explanation facing the Plates.] 



i 



