104 [October, 



head very pale straw-colour, marked with smoky-brown, the ocelli 

 black, and the mandibles reddish-brown ; frontal plate and anterior 

 legs polished black. 



In the next stage, that is, when about three-eighths of an inch 

 long, it has become considerably lighter in colour; the ground is 

 glaucous-green, the dorsal and sub-dorsal stripes purple, but more in- 

 terrupted, and not so wide as in the earlier stage ; head of the same 

 pale straw-colour, but not so clouded with darker, though the ocelli 

 are still black, and the mandibles reddish-brown ; the frontal plate is 

 gradually becoming pale like the head, the black being confined to the 

 front in some specimens, in others to a black edging, more or less 

 broken all round. Grround of the ventral area and the prolegs uni- 

 formly glaucous-green, the anterior legs now ringed with black only. 



In the adult stage, about half to five-eighths of an inch, the larva 

 has a still paler appearance. Ground-colour bright pea-green ; head 

 very pale straw-colour, faintly tinged with green, the large ocelli 

 intensely black, and consequently very conspicuous, the mandibles 

 reddish-brown, froiital and small anal plate of the same bright green 

 as the ground-colour ; the dark green (slightly brownish anteriorly) 

 pulsating dorsal vessel forms the dorsal stripe ; between it and the 

 spiracular region are two greyish-white stripes, on which the small i 

 black tubercular spots may be seen ; below the spiracles is a still 

 clearer and more conspicuous white stripe ; spiracles black. 



Ventral surface uniformly of the same bright green of the dorsal 

 area ; at the front, and at the base of each anterior leg, is an intensely 

 black spot ; and the prolegs are finely margined w^ith black. 



Feeds in the shoots of yarrow, apparently preferring the centrall 

 shoot, and eating downwards towards the root. 



It will be noticed from Mr. Buckler's description of the larva of" 

 JP. dicliro dactyl us (Ent. Mo. Mag., xii, 233), that both species corres- 

 pond in having three forms of colouring in the different stages of i 

 growth, and the resemblance of the adult larvae particularly, shows 

 the close relationship of the two species ; whilst the differences, apart 

 from the food-plants, are sufliciently wide to separate them. 



When full grow^n the larva leaves the shoot, and afiixes itself by 

 the tail to the outside of the stem, leaf, &c. The pupa is a little over ■ 

 half an inch long, and exactly of the shape of that of dichrodactylus ^ 

 as described by Mr. Buckler, though perhaps a little stouter, as it can i 

 hardly be called " slender," the word applied by Mr. Buckler to that 

 species. It has " a longish beak in front, projecting at a slight angle 



