12G [May, 



notched on the crown. Bodj of fairly uniform width, but segments 7, 8, 9 and 10 

 the widest ; it is round above, but flat ventrally ; there is a small hump at the back 

 of the 9th segment, and a smaller ridge at the back of tlie 12th segment ; segmental 

 divisions cleai'lj defined ; skin smootli and without hairs dorsallj, but there is a row 

 of tolerably dense short hairs pointing downwards below the spiracles, dividing 

 the dorsal from the ventral area. 



The ground of the dorsal area is putty colour, with strong greenish tinge, and 

 freckled, particularly at the hinder part of each segment, with minute brown dots ; 

 head pale pink, surrounded at the back with a conspicuous band of dark damson- 

 plum colour, this band narrows off to a point on each side the face, the upper part 

 of the face is also reticulated with this colour, but towards the mandibles are several 

 dark brown streaks, whilst on each mandible, and also on each side, is a dark brown 

 spot ; dorsal stripe very narrow, green ; spiracles oblong-oval, black, encircled with 

 greyish-white ; the hump on the 9th segment is darker than the ground colour, the 

 dark colour extending backwards, and forming a somewhat horseshoe-shaped mark ; 

 the back of the ridge on the 12t]i segment is also of this dark colour ; segmental 

 divisions of the same pink colour as the head. 



Ventral surface very pale greenish-white, with a large and conspicuous, nearly 

 triangular, almost black mark on segments 7, 8, 9, 10 and 11, and there are paler, 

 more rust coloured marks on the centre of segments 3 and 4 ; legs and prolegs of 

 the same colour as the ground of the ventral area, the anterior ones being tinged on 

 the outside with pink ; hairs greyish-white. 



In the half-grown larva the head is considerably wider than any of the following 

 segments, and the colours generally are of a darker shade all through. The head is 

 of a darker pink, but this colour is nearly lost in the broad, dull, black band at the 

 back, and the greater amount of equally dark reticulation on the face ; the gi'ound 

 on the dorsal area is much browner, and the narrow dorsal line is almost black ; the 

 tubercles, which are not noticeable in the adult larva, are distinct, ochreous-yellow ; 

 the spiracles are not so dark, and consequently much less conspicuous ; whilst the 

 ventral surface is pinkish-grey, and the outside of both anterior legs and prolegs, 

 together with the hairs, pink. 



The species feeds on asli and ])oplar, and both young and adult 

 larvae rest at full length on the twigs or small branches ; the six an- 

 terior legs, and the prolegs on the 9th, 10th and ventral segments, 

 which are larger than the others, are spread out from the body, and 

 give the larva a very sprawling appearance. 



Both larvse spun loose cocoons among the dead leaves, &c., at the 

 bottom of their cage, and changed to ordinary shaped pupae of a 

 purple-plum colour, powdered with greyish as a ripe plum also is. 



The moths, two fine specimens, emerged August 23rd and 26th 

 respectively. 



Huddersfield : January 8ih, 1890. 



