Species 135 



Icarus. Astrarche. 



Wings above lilac blue in Wings above brown in both 



male, brown with blue dusting sexes. 

 in female. 



No central spot on forewings A central dark spot present 



in male. on forewings in both sexes. 



No orange marginal spots vis- Marginal orange spots gener- 



ible on upper side of wings in ally present. 

 male. 



Under side of forewing with Under side of forewing with- 



two basal spots. out basal spots. 



Eyes hairy. Eyes naked. 



Now, looking abroad, we find in south-eastern 

 Europe a butterfly, P. anteros, whose male has eyes 

 destitute of hairs, while the wings are mostly of a 

 greyish blue colour, though with a distinct black 

 central spot on each forewing, and traces of the 

 orange marginal spots visible above ; the area of the 

 wings for some distance within the margins is dark 

 brown. The female has eyes covered with very short 

 hairs ; the upper surface of her wings is dark brown, 

 with marginal orange spots and a central black spot 

 on each forewing, as in P. astrarche, from which she 

 is distinguished by possessing beneath each forewing 

 a single basal spot. In mountain pastures in the Alps 

 and Pyrenees another species, P. eros, occurs. The 

 upper surface of the male's wings resembles in colour 

 P. anteros, but there is no central spot on the fore- 

 wings, nor any trace of orange marginal spots. The 

 female's wings are brown above, but dusted more 

 or less with blue scales, like those of P. icartis. And 

 the forewing in either sex, also as in P. icarus, has 

 two basal spots beneath, while the eyes are hairy. 

 Reviewing these species we see that those characters 

 wherein P. anteros differs from P. astrarche lead on to 

 P. eros, which itself occupies a'middle place between 

 P. anteros and P. Icarus. Examining the variation 

 presented by P. icarus, it is found that the two 



