TRIFID.^. 243 



Underside of the fore wings greyish, whiter at the margins ; 

 a grey transverse line beyond the middle ; cilia pale grey 

 spotted with black ; hind wings whitish with a black central 

 spot followed by a slender blackish elbowed transverse line ; 

 hind margin with black dashes ; body whitish ; legs whitish, 

 dusted with grey ; anterior pair barred in ft-ont with black. 



Apparently not variable except in very rare instances. A 

 specimen in the collection of the late Mr. F. Bond, now in 

 the possession of Mr. Sydney Webb, at Dover, is nearly black, 

 except the reniform stigma, which is yellow. 



On the wing in Zv\^. 



Larva rather tapering in front ; on the fifth segment are 

 two small but distinct humps, and on the back of the twelfth 

 is another, very prominent, double at the apex ; from this it 

 tapers regularly off to the anal flap. Ground colour rich 

 velvety yellow-green, well relieved by a deep crimson-brown 

 dorsal stripe faintly bordered with yellowish, beginning on 

 the head, where it occupies the full breadth, tapering a little 

 on the second segment and again on the third, widened on 

 the fourth so as to embrace the two humped tubercles on the 

 fifth, and then diminished to no more than a broad stripe on 

 the sixth and seventh, but suddenly widened on the eighth 

 and ninth, and thence very gradually less to the hump on the 

 twelfth, whence it is only narrow to the anal flap ; raised 

 spots all of the yellow-green ground colour, even those on 

 the dorsal stripe, though the bases of these latter are blackish ; 

 each bears one long blackish hair and a few short ones, 

 except on the lower parts of the body, where they are whitish; 

 spiracles white, finely outlined with black ; remainder of head 

 greenish, glossy; second segment slightly glistening; legs 

 and prolegs green. When quite full fed it becomes very 

 dingy, dark velvety-green, and the crimson-brown of the 

 back almost fades away ; the raised spots appear black, ringed 

 with green, and sometimes a greenish dorsal line appears. 

 One variety occurred, after the last moult, in which the whole 



