TRIFID.-E. 325 



deep black submarginal band, cut off toward the apex of the 

 wing by a large white cloud ; cilia yellow. Body and legs 

 white, anal tuft tinged with orange. 



There is considerable variation in the ground colour of the 

 fore wings, from light bright orange-brown or chestnut to 

 brown-drab, and to deep dark brown with a clouding of 

 chestnut, almost black-brown ; also in the degree of distinct- 

 ness of the white lines or shades on the costa, which some- 

 times in the female are totally absent, and occasionally verv 

 strongly expressed, and this seems to occur without reference 

 to the tone of ground colour. A form of quite unusual beauty, 

 of which Mr. Sydney Webb possesses several, has the basal 

 area to the stigmata spotted and clouded with deep black, 

 and further clouding of the same from the middle of the wing 

 to the apex ; the transverse lines are also intensified. In the 

 collection of the Rev. Joseph Greene is an example in which 

 this variation is amplified by similar black blotches quite 

 through the middle of the wing from base to apex. In Dr. 

 Mason's collection is a specimen, reared at Burton-on-Trent, 

 of a light purplish-red, and having a very large white costal 

 blotch at the second line. 



On the wing in July and August. 



Lakva moderately stout, tapering a little at each end ; 

 head shining, pale green ; body rather shining whitish-green, 

 dorsal line broad, conspicuous, white ; subdorsal and spiracular 

 lines narrower, whitish ; usual raised spots white ; spiracles 

 black, set in white triangles, which are margined with black, 

 base downwards ; legs black ; prolegs green, tipped with fer- 

 ruginous. (C. Fenn.) 



April to June, on elm, hiding in the daytime between 

 leaves. When full grown it often becomes restless, and 

 wanders about the trunks of the elms and the ground 

 underneath them, probably in search of a suitable place 

 for pupation. In the egg-state through the winte;- 



