226 LEPIDOPTERA. 



looked upon as a distinct species, under the name of hrady- 

 porina. They seem to prevail in the Western and Midland 

 districts and also in the North, but so far as I am aware are 

 not anywhere much darker in general colour than those from 

 Norfolk. In Mr. C. J. Wainwright's collection is a Warwick- 

 shire specimen, wholly dark grey without distinct markings. 

 In the mosses of Lancashire and Yorkshire, where the ground 

 colour is of a smoky-grey or slate-grey, the usual black 

 markings are more obscure. The most curious specimen 

 known to me is whitish on one fore wing, dark grey on the 

 other. It is in the collection of the late Mr. Bond. Irish 

 specimens are reported to be usually white or pale grey. 

 One in the collection of the Eev. W. W. Flemyng of Portlaw 

 is uniformly greyish-white, except the black perpendicular 

 streak in the middle of the costa, which is sharply marked. 

 In some parts of Scotland, as around Loch Laggan, it has 

 been found beautifully white, with dark markings. 



On the wing in May and June, in more northern districts 

 sometimes in July. There is but a single generation in the 

 year. 



Lakva nearly cylindrical, thickest at the seventh to ninth 

 segments, rather truncate at the tail. Colour pale apple-green 

 with no markings, spiracles white, with a fine black line, head 

 and legs paler green, labrum and palpi nearly white, darker 

 beneath. The surface is uniformly clothed with long, 

 perfectly white hairs, which stand erect for about one-twelfth 

 of an inch of their length and then bend down parallel to the 

 larval surface for a length of about one-fifth of an inch ; thus 

 forming a continuous coat or surface at the distance of one- 

 twelfth of an inch from the larva. Very inconspicuous are 

 some black hairs, two to three on each anterior trapezoidal 

 raised spot, one to each posterior, a little longer on the anal 

 segment, where they mix with the white hairs. This form is 

 that usually found in the South. In the North the dominant 

 form appears to be that which has a yellow skin and yellow 



