252 LEPIDOPTERA. 



segment brownisli-grey ; hump on the twelfth edged behind 

 with blackish. Head dark-brown, with a distinct dull 

 orange facial A-mark. Spiracles black. On the second 

 segment is a narrow dorsal line. Dorsal stripe sometimes 

 chalky-white, especially when full-fed (C. Fenn). 



The newly hatched larva is very distinctly larger than 

 that of A. tridens ; the raised spots are larger and more 

 angulated and the lateral plates of the pro-legs very distinctly 

 darker; segments 3, 1, G, 7, 10 and 11 are pale, the rest 

 dark, except segment thirteen, which is intermediate. Seg- 

 ment twelve is already large and dark. Each raised spot 

 has a single hair. After the firet moult the larva is blacker 

 with longer hairs, second, fifth, and twelfth segments almost 

 humped, the dorsal hairs black, the lateral white ; dorsal 

 stripe beginning to appear. After the second moult the 

 dorsal stripe is more distinct and continuous, and the adult 

 colouring begins to be noticeable, but the tubercle on the 

 fifth segment is still only a hump formed of some of the 

 dorsal raised spots ; the hairs arising from the spots are more 

 numerous, and the sides are reddish-grey marbled with 

 yellowish-grey. From the third moult it gradually completes 

 its change to the adult appearance. (Dr. Chapman.) 



August, September, October, on rose, lime, hawthorn, 

 birch, sallow, and, indeed, on all the ordinary leaf-bearing 

 deciduous trees. 



It is very noticeable in the autumn from its bright con- 

 spicuous colouring, singular dorsal tubercle, and from its 

 habit of wandering about the trunks of trees in the daytime, 

 not only when full-fed and in search of a soft spot for pupa- 

 tion, but also when little more than half grown. Its wander- 

 ings are sometimes extended to footpaths and fences. 

 Readily separated from the last species by the long, slender 

 tubercle on the fifth segment, its pale yellow or whitish 

 dorsal stripe, and narrower sub-dorsal black and red stripe. 



Pupa elongate, shining, anal extremity blunt with several 



