DELTOIDES. -i 2 5 



white, commencing on the second segment, continue of the 

 same width throughout, but draw rather nearer to each other 

 as they approach the thirteenth ; the outer edge of these is 

 straight, but the inner concave on every segment, so that the 

 green ground of the back appears as a series of broad ovals 

 with a darker green dorsal line running through them ; 

 segmental folds greenish-yellow; spiracles round, flesh-colour, 

 faintly edged with black; raised dots glossy green, each 

 bearing on its summit a dusky dot, from which springs a 

 rather long rough hair, which, when highly magnified, is 

 seen to be barbed ; undersurface pale green ; all the legs and 

 prolegs green ; the latter fringed with fine blackish hooks. 



When newly hatched it is quite hairy, the head whitish- 

 brown, with dark mouth and ocelli ; a dark grey internal 

 vessel can be but indistinctly discerned through the skin of 

 the body. As it grows its dorsal region becomes green, 

 then dark purplish-red from the colour of the internal vessel, 

 but this is interrupted on the tenth segment. After the 

 second moult the double dorsal and whitish subdorsal lines 

 begin to appear, the head is pale green with minute dusky 

 specks, and each raised spot has a similar glossy dot bearing 

 a long black hair. These colours are maintained until hyber- 

 nation, which takes place on a little foothold of silk upon 

 the food-plant ; but afterwards the green colour re-asserts 

 itself, and the adult colouring is gradually assumed. (Adapted 

 from Buckler.) 



August till May on Br achy podium sylvaticwni, and probably 

 other grasses, since Phalaris arundinacea has certainly been 

 accepted as a substitute ; eating out notches in the sides of 

 the grass-blades, or when more nearly full-grown eating 

 them obliquely through. 



Pupa of ordinary form, the wing-covers well developed, 

 with their nervures in strong relief; abdominal segments 

 smooth and very slightly defined; anal tip furnished with 

 several minute, curly-tipped, shiny bristles, which are thrust 



