DELTOIDES. 293 



hind margin yellow-brown. Body and legs brownish- 

 drab. 



Not variable, except in a small degree in the extent and 

 depth of colour of the dusting of the fore wings. 



On the wing from the end of May till the beginning of 

 July. 



Larva five-eighths of an inch in length ; thick and stumpy 

 in proportion ; thickest in the middle ; head globular and 

 smaller than the second segment ; segments and transverse 

 folds distinctly brown ; all the legs tolerably well developed ; 

 ventral surface slightly flattened. Ground colour deep, rusty 

 reddish-ochreous, with a pattern of diamond figures on the 

 back and sides as follows : down the back a row, one diamond 

 on each segment, the widest part behind the middle of the 

 segment, and the blunt ends meeting at the segmental divi- 

 sions ; this row is filled up with faintly blackish freckles and 

 is traversed by the dorsal line, which is dull black ; next 

 below this is a row of diamond outlines, the widest part of 

 each at the segmental fold, the ends meeting just behind the 

 middle of each segment where the dark dorsal diamond is at 

 its widest ; below this is another row alternating in the same 

 manner, the widest parts extending down to the spiracles ; 

 these lateral rows, though only outlines, are also filled with 

 freckles, but so faintly as to be scarcely noticeable ; usual 

 raised dots blackish, set in rings of the ground colour; spiracles 

 black ; segmental divisions pale ochreous ; head rather dusky ; 

 skin soft and velvety. (Condensed from Mr. Buckler's des- 

 cription.) 



August to October, hibernating when nearly full grown, 

 but feeding again a little in the spring. On dead leaves of 

 birch, oak, and alder upon the ground, also upon birch 

 catkins in the spring. But the Rev. H. H. Crewe says that 

 he obtained larvae by heating birch and oak, and that after 

 hibernation they gnawed the outer cuticle of the bark of 

 whitethorn and gooseberry. Probably any withered similar 



