LA RENTIDAL—A S THEN A . 203 



attendant lines sometimes becomes darkened and very 

 distinct, in other cases, faint, or, on the other hand, clouded 

 and suffused into a rather broad brown stripe. There is also 

 a form found in Yorkshire iu which the ground colour is 

 of a purer white. 



On the wing' in June. 



Lakva stout, tapering considerably to each extremity ; the 

 segmental divisions rather well marked; head small, liilid, 

 shining, dark brown, mouth paler ; on the second segment is 

 a shining horny dark brown plate ; general colour dark 

 purplish-brown ; pale greenish-yellow on the sides of the 

 second to the fifth, and eleventh to thirteenth segments, and 

 the undersurface of these segments pale green ; on the tenth 

 is a pale yellow lateral spot ; dorsal line threadlike, whitish, 

 intersecting whitish V-like markings, of which the apex is in 

 front, on the seventh to the ninth segments ; from the tenth 

 to the anal extremity the dorsal region is purplish-red ; 

 usual raised spots Ijlack ; legs and prolegs yellow-green. 

 (Chas. Fenn.) 



•July to the lieginning of Septendjer, on alder, sallow, 

 birch, and sometimes lilacktliorn ; feeding on the more 

 tender leaves. 



Pupa short, thick, most so in the middle, where the wing- 

 covers are swollen; very glossy; but the wing and limb- 

 covers minutely sculjitured with irregular lines, and the 

 segments with minuti- pits ; greenish-brown, with yellowish 

 divisions to the abdondnal segments; anal segment obtuse, 

 anal structure swollen ; cremaster broad, but tapering to a 

 sharp spike. In a slight cocoon in the ground. 



In this state througli the winter. 



The motii sits sometimes during the day upon the trunks 

 of trees, especially oak-trees, in the neighbourhood of sallows 

 and alders ; more frequently in the sallow-bushes or alder- 

 trees, and may be aroused by the lieating stick, though its 



