ACIDALIin.E—ACWAI.IA. 43 



very oblique, gently rounded ; dorsal margin almost straight, 

 fully ciliated ; colour white, more or less dusted with grey ; 

 first line obscure and sleuder, oblique, grey, expanding into 

 black dots on the uervures ; discal spot dull black ; close to 

 it is the central shade, a slender angulated cloudy smoky- 

 grey line ; second line formed into an oblique waved series 

 of cloudy-black dots ; beyond it is a double series of small 

 smoky-black or smoky-grey clouds, separated by a rippling 

 and undulating white subterminal line, the outer series 

 placed close to the hind margin, which outside them is 

 spotted conspicuously with black dots or almost triangles ; 

 cilia white, dusted with grey. Hind wings broad, rounded 

 behind, white, thickly dusted with grey ; central spot black, 

 preceded by a faint indication of a dusky transverse stripe, 

 more distinctly followed by two undulating stripes of small 

 grey clouds, edged outwardly with darker grey ; extreme 

 hind margin similarly clouded, and also edged with black 

 crescent-like dots ; cilia dusky white. Female quite similar. 



Underside of the fore wings smoky-white, darker toward the 

 costa, but devoid of markings, except a faint series of whitish 

 ripples toward the hind margin. Hind wings silk'y-white ; 

 central spot black ; other markings of the upper side hardly 

 indicated; hind margins of all the wings edged with black- 

 brown lunules; cilia silky brownish-white. Body brownish- 

 white, legs pale brown. 



Variable in the degree of grey, or smoky-black, dusting or 

 clouding ; also more particularly in the dark clouding outside 

 the second line ; often when this is dark the subterminal line 

 becomes broader and whiter. In specimens from Portland 

 and from the Devon coast this dark clouding is often very 

 scanty or absent, the ground colour becoming white and the 

 regular markings very neat and pretty. In some obtained 

 by ]\Ir. R. Adkin at Eastbourne, Sussex, the ground colour is 

 of a most exquisite creamy-white, and the markings being 

 delicately pencilled, they are of quite singular beauty ; these 

 occurred along with numbers of typical and intermediate 



