TRIFID.E. 357 



Larva of almost uniform width, but each extremity a very 

 little smaller, the divisions deeply cut, giving each segment 

 a plump appearance ; head shining dark grey-brown mottled 

 and streaked with blackish-brown ; a shining black plate on 

 the second segment is ornamented with two rather broad 

 angulated whitish stripes; back and sides brownish-grey 

 delicately mottled with a darker tint of the same ; dorsal 

 stripe broad, dirty-white, faintly continuous, and widest in 

 the middle of each segment, margined at each segmental 

 division, before and behind, with short, thick, black curves ; 

 on the anal extremity is a thick cruciform black mark ; 

 subdorsal line a very thin thread of dirty white delicately 

 and uninterruptedly edged with black ; the space between 

 it and the spiracular region darker greyish-brown than the 

 back, with a paler blotch in the middle of each segment ; 

 spiracular stripe freckled pale brownish-grey edged above 

 by a black line ; spiracles dirty white outlined with grey 

 and inconspicuous ; usual raised dots whitish, delicately 

 ringed with black, and having a minute black centre with 

 a short and very fine hair ; under-surface and legs slightly 

 mottled greenish-grey. 



When two-thirds grown the dorsal broad stripe is more 

 broken — continuous on the third and fourth segments but 

 contracted and expanded, while on the others it is only visible 

 and expanded towards the end of each segment, except the 

 twelfth and thirteenth, where it is widened into a broad 

 blotch extending to the sub-dorsal region and strongly 

 margined with black ; from its base on the middle segments 

 is a brownish-grey streak on either side curved obliquely 

 forward to the middle of the subdorsal line. 

 - A'ery suggestive of lichen ; indeed, its perfect assimilation 

 to the crevices in the bark of ash-trees accounts partly for 

 its remaining so long undescribed in this country. (Adapted 

 from Mr. Buckler's notes.) 

 • April and May or June on ash, but it was found by Mr. 

 Edmunds of Worcester that if the eggs were kept in a higliei- 



