26 WOOD WHITE. 



word; Coggeshall and Eaydon Woods, near Hadleigh, Essex, as R. 

 M. Postans, Esq. has informed me; Grange, near Ulverstone, in Lan- 

 cashire; Lewes and Brighton, in Sussex; and very abundantly in all 

 the woods in the neighbourhood of Ardrahan, in the county of Galway, 

 in Ireland, as I have just learned by an obliging communication from 

 A. G. More, Esq., of Trinity College, Cambridge. 



The caterpillar feeds on the different species of Lathyrus, Lotus, 

 and Orohits ; the Vetch, l^icia cracca, and, according to Fabricius, 

 the Si//ajm, or wild mustard; but this is now said not to be the 

 case, so that the specific name thence given to it has been altered. 



This fragile-looking butterfly measures from one inch and a half to 

 nearly two inches across the wings. It is of a delicate white colour, 

 with a rounded dull black spot at the tip of the fore wings. In some 

 specimens, however, this spot is nearly obliterated, and in others is 

 entirely wanting. 



Underneath, the fore wings have the front margin greyish coloured, 

 and the base and tip of these wings very pale yellowish green. The 

 hind wings are tinted very faintly with greenish yellow, with the 

 nerves, and two irregular, and in many instances interrupted, transverse 

 bars, of a greyish ash-colour. 



The female resembles the male. 



The caterpillar is green, darker near the end, and with a yellow 

 stripe along the sides, above the feet. 



The chrysalis is at first of a greenish colour, but afterwards 

 becomes whitish grey, with red dots on the sides and upon the wing 

 cases. 



