ACIDAUrn.E—ErifVRA. 317 



almost straio-lit to a blunt Hat aiiylt' in its middle; colour 

 pale yellow, paler towards the costa ; near the base is a smoky- 

 black transverse line formed into two curves ; in the middle an 

 ovate central spot, in the form of a black compressed ring- 

 filled in with white ; near this is some blackish dusting- 

 towards the dorsal margin : beyond is an irregular black 

 transverse line of scallops and ])ointed angles, dusted in- 

 wardly with black ; between this and the hind margin is a 

 more regular curved stripe of cloudy-black dusting, some- 

 times very faint ; hind margin edged with a thin black line, 

 or series of black-brown streaks ; cilia yellowish-white. 

 Female extremely similar, but with simple antenna?. 



Underside of all the wings yellowish-white ; fore wings 

 tinged with yellow on the costa and hind margin ; second 

 line partly visible as a rippled blackish stripe from the costa ;, 

 other markings only perceptible as shades from the upper 

 side. Body and legs yellowish-white. 



Generallv not very variable, but liable to interesting' and 

 very persistent local strains of variation. In Kent, in the 

 Dover district, Mr. Sydney Webb finds a race in which the 

 smoky-black central stripe which forms the backing to the 

 beautiful loops of the second line, is very much intensified^ 

 sometimes broadened, in other cases of a deeper black ; in some 

 individuals this darkening process is extended so that in one 

 of Mr. Webb's specimens the base and dorsal margins of all 

 the wings are blackened, there is a black stripe along the 

 subcostal nervure of the fore wings and a very broad black 

 transverse band, which on the hind wings is less black but 

 almost equally broad and followed by a black submarginal 

 stripe. Another specimen has the outer half of all the wings 

 occupied by much paler smoky-black bands ; and these are 

 connected with the typical form by all intermediates. 

 Another local race has appeared in Devonshire, where, in the 

 year 1868, the Rev. J. Hellins reared, from larva? obtained 

 by Mr. D'Orville, in both emergences, specimens devoid of 

 the ring-spots of both fore and hind wings. More recently 



