ACniAIIID.K—ACinALIA. 15 



Underside of all the wings in colour and marljiugs an 

 almost accurate repetition of tlie upper side, but the ground 

 colour a little whiter, and a brown shade lies along the costa. 

 Body and legs whitish-brown ; the hinder pair of legs, in the 

 male, heavily tufted with long hair-scales which can readily 

 be spread into fan-like form, the tarsi aborted. There is no 

 trace of this structure in the female. 



Variable, as already pointed out, in the breadth, or even in 

 the existence, of the smoky band beyond the second line ; 

 moreover, in occasional specimens the smoky colouring is 

 extended over the whole of the fore and hind wings to their 

 bases ; and in others is totally absent, the lines also obscure, 

 except the central, which with the discal spots are then the 

 only noticeable markings. 



On the wing in June and July. 



Lakva about three-quarters of an inch long, slightly flat- 

 tened, slender, tapering very gently toward the head, which 

 is notched, and scarcely smaller than the second segment ; 

 skin rugose ; bristles slightly clubbed ; ground colour dingy 

 drab, warmer on the back, more dull below; the segmental 

 divisions between segments four and ten show as broad black- 

 brown bands round the body, and are shaped on the back by 

 some dark oblique dashes which reach to the spiracles, form- 

 ing a broad clumsy /\ pointing forwards ; there is a double 

 dark brown, dorsal line to be traced when the ground colour 

 in the middle of each segment allows it to be seen. 



A variety is so dark on the back that the segmental 

 divisions are no darker than the ground colour, but tin; space 

 between the double dorsal lines is distinctly ]ialer throughout, 

 and the oblique dashes which outline the l\-% can still be 

 traced. 



Another variety, from "^'orkshire, has the grounil colour 

 pale ochreous ; the broad bands wanting ; the double dorsal 

 line very fine, most distinct at the divisions ; the subdorsal 

 lines and oblique dashes fine also, all brown in colour; under 



