2o6 LEPIDOPTERA. 



being at the base and along the margins. Mr. Webb laas one 

 very similar, but with a black spot in the middle of the fore 

 wings near the costa ; and another in which all the markings 

 are normal, but the usually whitish portions are pale ochreous- 

 yellow. In Mr. C. A. Briggs' collection is one in which even 

 the marginal dark mai'kings are nearly obliterated ; and in 

 that of Mr. S. Stevens is one of a light primrose colour, with 

 the dark markings reduced to mere lines, except a large 

 blackish central blotch and the marginal band, which are 

 distinct; and another with the usually blackish ground colour 

 pale golden-brown. Extremely pretty variation occurs also 

 in the under side, particularly of the hind wings, the dark 

 colouring in the males being sometimes extended so as to 

 break through the pale central band in two or three places ; 

 while that of the female assumes occasionally a rich, creamy, 

 ochreous colour. But when the upper side is broadly 

 white, the same occurs beneath, the correspondence be- 

 tween the two surfaces being maintained with remarkable 

 fidelity. 



An extraordinary structural aberration is in Mr. Webb's 

 collection— a female not crippled in the smallest degree, but 

 having an unaccountable extension to one of its fore wings, 

 which is elongated and squared, and its shape totally changed. 

 Such a variation as this seems to be inexplicable. 



On the wing in July and August. 



Larva. — When full grown, about \\ inch in length, stout, 

 cylindrical, tapering from the fifth segment to the head and to 

 the tail ; head proportionately small, globular ; anal flap with 

 two short spines, pointing backwards ; body and head finely 

 set all over with short hairs ; all the legs small, short, and 

 placed near together. Colour dull buff, with the lines brown 

 or very pale yellowish-green ; with dark green dorsal line, 

 sub-dorsal line pale yellow edged with green — faintly above, 

 but more strongly below ; subspiracular line paler than the 

 general colour ; spiracles small, round, and black ; head pale 



