CLOUDED SULPHUE. 75 



Varieties of the female are also met with, of various 

 intermediate shades of colour between the white and 

 the ordinary orange. 



Yet is it not possible that all these varieties may be 

 mules between C. Edusa and C. Hyale (the next species), 

 the males of which are often seen pursuing the lady 

 Edusas ? but if so, as indeed it would be on any other 

 hypothesis, it is hard to account for the unvarying 

 character of the male. 



This butterfly is also called the Clouded Saffron. 



THE CLOUDED SULPHUE, OR PALE 

 CLOUDED YELLOW BUTTERFLY. 



(Colias Hyale.} (Plate III. % 4.) 



WE may, in general, readily distinguish this elegant 

 insect from the last species the females of which it 

 rather resembles in its markings by the difference in 

 the ground tint of the wings, which in this vary from 

 primrose or sulphur yellow to a greenish white. 



There is, however, some risk of confounding this 

 with the white variety of Edusa (Helice), a mistake 

 often committed by young entomologists ; so it will be 

 well to point out the most prominent distinction between 

 the two ; and this is easily done, by observing that in 

 Edusa the dark border of the upper wings is of nearly 



