1 82 LEPIDOPTERA. 



uenration of this species is variable. Miss Kimber informs 

 me that in iDoth races the small nervures near the costa of the 

 fore wings, veins 9, 10, 11, are very unstable in their form. 



On the wing — first race in March and April, in very for- 

 ward years even at the end of Februaiy — its second genera- 

 tion in July and August ; second race in May and June, its 

 second generation in August. I have taken specimens of the 

 second race in Surrey as early as April ; indeed, I find that 

 both races occurred in one year in that month ; also both 

 races then produced second generations. This does not 

 appear to be always the case in more northern districts. 



Larva twig-like ; skin glossy ; third segment enlarged 

 laterally, twelfth segment furnished with a horseshoe-shaped 

 prominence enclosing two minute tubercles ; head small, 

 slightly bifid, and rather triangular, greyish-brown, reticu- 

 lated with dark brown ; face flattened, and ornamented with 

 an ochreous, indistinctly margined, transverse stripe ; sides 

 much puckered ; general colour pale greyish-brown, shaded 

 with red and grey ; subdorsal lines conspicuous, interrupted, 

 dark grey ; dorsal line grey but indistinct, forming dark spots 

 on the middle segments; third segment with two longitudinal 

 black dorsal dashes and a black spot in the subdorsal line ; 

 spiracles black ; legs and prolegs tinged with red ; hump on 

 the twelfth segment edged with black ; tubercles ochreous ; 

 a dark grey waved shade on the sides below the spiracles 

 extends from the head to the first pair of prolegs, forming a 

 blotch on each of the middle segments, and continued under- 

 neath the tenth ; undersurface between the prolegs greenish- 

 white ; three minute points on the anal segment. (0. Fenn.) 

 Variable in colour to brown, reddish-brown on the back, and 

 orey-brown. and even to dull black; also in the distinctness 

 of the spiracular stripe, which sometimes is yellow and con- 

 spicuous, often but little paler than the ground colour. Mr. 

 Fenn's description of the larva of T. larkaria does not difier 

 in any material point from that quoted above ; and a series 



