230 LEPIDOPTERA. 



reniform stigma faintly indicated by a brownish crescent ; 

 beyond it is a slender faint brown transverse line or shade. 

 Hind wings shining yellowish-white, dusted over the costal 

 region and nervures with ochreous, and having a slender 

 curved brownish transverse line beyond the middle ; central 

 spot hardly perceptible ; body and leg tufts ochreous ; legs 

 yellow-brown. 



This description is taken from a well-marked typical 

 Southern example — a central form around which there is 

 much divergence. One phase of not infrequent variation 

 consists in the obliteration of the usual markings, and in 

 the South and East of England this is met with in varying 

 degrees, until a form is reached in which the fore wings are 

 of a smooth, uniform pale ochreous, totally devoid of mark- 

 ings, or in which there is only a faint row of brown dots 

 along the subterminal line ; but every possible intermediate 

 seems to exist, in some specimens the edges of the stigmata, 

 in others portions of the lines and central bar, faintly showing 

 themselves, and the extreme — devoid of all markings — being 

 rather rare. In some of these the submarginal cloud of the 

 hind wings becomes quite a dark band. All these seem to 

 be included in a form known on the Continent as xar. 

 ochracea. 



Another development, apparently confined to the chalk 

 districts and coast of Kent and Sussex, has the ground colour 

 white, or creamy white, usually with only the central mark- 

 ings, the hind margin being absolutely immaculate, even to 

 the cilia; but more rarely, with the chalky- white ground 

 colour, all the markings are present, faintly grey-brown, and 

 the hind marginal region clouded with the same, all the 

 usual warm yellow-brown tones of colour being absent. 



In the South of Scotland, where it has been carefully 

 worked up by Mr. Adam Elliot, a form is found having a 

 tone of colour different to all those hitherto mentioned, the 

 ground colour very pale dull brown with all the darker 

 markings and cloudings deep umbreous, and the cloudings 



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