TRIFID^. 259 



very similar, the colour of the fore vviugs sometimes rather 

 darker, and the hind wings more of a uniform pale grey- 

 brown. 



Underside pale greyish-brown, with three blackish costal 

 clouds, from the third of which is a dark grey transverse 

 stripe ; cilia pale grey, barred with blackish. Hind wings 

 whitish dusted with grey, with a distinct, slender, central, 

 transverse, curved stripe, and in the curve a grey central 

 spot ; beyond it a second and more slender transverse line ; 

 hind margin edged with grey ; cilia whitish. Body whitey- 

 brown ; legs whitish barred with grey. 



Slightly variable in the depth of ground colour and 

 in the distinctness of the markings, some specimens being 

 pale and sharply marked, others much obscured with dark 

 grey. 



End of April, May, and again at the end of J uly and in 

 August. 



Certainly in some degree double-brooded, since the moths 

 of the spring emergence are said to be the larger ; and the 

 moth has been reared in August from a June larva ; but Dr. 

 Chapman when studying the species did not find that the 

 produce of eggs of the early specimens produced moths until 

 the following spring. 



Larva, when full-grown, about one inch and a half long ; 

 cylindrical, but the head smaller. Ground colour of the body 

 and ventral legs dark slate-grey ; head and anterior legs 

 black and shining ; a black plate on the second segment ; all 

 the segments divided by very narrow black bands ; a broad 

 velvety-black transverse band across the middle of the back 

 of each segment on which are placed four orange tubercles in 

 the usual order, the anterior pair being much the larger, 

 except on the third and fourth segments, where they are of 

 equal size and placed in a transverse row ; all the tubercles 

 are furnished with bright golden-yellow silky hairs, which 

 give the larva a very beautiful appearance. Spiracles white, 



