1G8 



THE COLORING OF BUTTERFLIES, 



Another striking example may be found in 

 the Blue-eyed Grayling [Figs. 143, 144], the di- 

 morphism of which has recently been made out by 

 Mr. Edwards. Once the two forms, called respec- 



FIG. 143. Cercyonis Alope, nat. size ; under surface on right (Harris). 



tively Alope and Nephele, were universally con- 

 sidered distinct species ; and not unreasonably, 

 for they were known to inhabit partly different 



FIG. 144. Cercyonis Alope, form Nephele, nat. size ; under surface on right 

 (Harris). 



regions, Alope being a more southern and Nephele 

 a more northern form ; there is indeed a wide ex- 

 panse of territory which they inhabit in com- 

 mon, but with varying abundance, according to 



