B OA RMID.'E —FID ON I A . 2 3 



placed before the hind margin, and is thickest towards the 

 costa ; from this a fifth stripe of the same colour, lying- along 

 the hind margin, is separated by a slender dotted line of the 

 white ground colour ; cilia white chequered with black. 

 Hind wings rather narrow, rounded behind ; white, dusted 

 and striped as in the fore wings, except that one black stripe 

 is omitted ; cilia similarly chequered. Female very similar. 



Underside a repetition of the upper, but the stripes, on 

 all the wings, grey rather than black. Body and legs black, 

 dusted with white. 



Very constant in colour and markings, but in the collection 

 of Mr. S. J. Capper is a female specimen in which the 

 stripes are strongly marked, of an unusually deep black. 



On the wing at the end of April and in May. 



Larva. Head slightly narrower than the second segment, 

 not retractile ; body uniformly convex above, somewhat 

 dilated at the sides, where there is a very distinct undulated 

 skin-fold below the spiracles ; colour of the head dull brown, 

 face variegated with whitish -brown ; dorsal surface of the 

 body dingy wainscot-brown, of two shades, disposed in very 

 obscure rivulet stripes ; this is bounded on each side by the 

 pale skin-fold, and where it meets this is much darker, its 

 darker margin coming into immediate proximity with the 

 pale skin-fold makes the latter more conspicuous ; minute 

 dorsal raised dots black ; spiracles pale, with black rings ; 

 ventral rather paler than the dorsal surface, and a broad 

 median stripe still paler ; legs and prolegs of the colour of 

 the ventral surface. (E. Newman.) 



June and July on birch and sallow, especially Salix cinerea, 

 feeding at night ; hiding during the day on the underside of 

 a leaf. ' 



Pupa apparently undescribed ; on the ground among 

 fallen leaves. 



The winter is passed in this condition. 



