148 THE CANADIAN ENTOMOLOGIST 



a pair often of great pink larvae which have their whereabouts 

 hidden to such a remarkable degree. 



The last week of May can be assigned as the date of general 

 emergence from the over-wintering egg, and maturity is reached 

 about Aug. 1. It did not develope that there was the usual amount 

 of parasitism from the smaller hymenoptera that work so assidu- 

 ously against most of the allies about the fourth instar, and only 

 Ceromasia myoidcEa seemed to assail the last stages, but this Tachinid 

 was a prevalent check. 



The following brief tabulation, except for the first instar, may 

 sufficiently place the larva : 



Stage II. — Generically typical, of the group with dark purplish- 

 brown girdle which is not crossed by the white lines; head shows 

 side line; tubercles well developed but not large, blackish, IVa 

 absent on joint ten. Head and cephalic shield concolorous, dorsal 

 and subdorsal lines whitish and broken at girdle. 



Stage III. — Colour unchanged, tubercles not prominent, 

 except on joint eleven III and Ilia are fused into a large plate 

 greater than the spiracle and the latter somewhat larger than the 

 anterior ones, and on twelve I and II are of the usual prominence. 



Stage IV. — Head has lost dark line at ocelli, is chestnut brown; 

 the cephalic shield is as wide as head, yellow, margined laterally 

 with a black border; lines white and conspicuous, the girdle becomes 

 a shade paler; tubercles the same. 



Stage V. — Colour changes to a pinker tone, otherwise similar; 

 the fused III and Ilia on eleven remain the largest of the lateral 

 plates, which on the whole are small. 



Penultimate Stage. — Colour is pronounced pink, the trans- 

 lucence at the sutures giving a ringed appearance, the white lines 

 are nearly lost except the dorsal on the thoracic joints; tubercles 

 and spiracles black, the former reduced; III and Ilia have separated 

 on joint eleven. 



Maturity. — A robust larva with prominent brown head , 

 cephalic and anal plates, the tubercles except I and II on joint 

 twelve inconspicuous; IVa has never developed on joint ten, and 

 on eleven HI and Ilia still more separated, the former the largest 

 lateral plate; IV never gains its usual prominence as occurs with 



