126 THE ENTOMOLOGIST. 



On May 25th the centre area of ova had changed to a light 

 coral-red leaving the envelope the same tiut as hefore. Some 

 three dozen ova were deposited, all hut four on leaves of birch, 

 in all cases but two these were on the upper side. The four 

 ova that were not deposited on birch were on the stems of 

 C, vulgaris. 



On May 30th the central area of the ova was light coral, 

 with colourless transparent envelope. 



On June 1st they had changed to lead colour throughout, 

 and on the following day the larva commenced to emerge. 

 They were then about 1 mm. long, head black and glabrous, 

 thoracic plate dark brownish-green, remainder of segments 

 brownish-green. When exposed to light the larva crawls with 

 intense activity, and makes for concealment. When placed in 

 a small box with two birch leaves, one laid over the other, it 

 spun them together, and fed between, upon the lower cuticle 

 of the upper leaf. 



On June 8th, a larva, kejit separate for observation, had 

 reached the second instar ; it was then 3 mm. long ; the 

 head was glabrous, light brown, with darker markings round 

 the mouth, thoracic plate glabrous, putty coloured, with two 

 dark lobes behind, one on each side; the remainder of the 

 segments were greyish-green, darker along the dorsal area; the 

 tubercles were prominent and black, the larva was transparent, 

 alimentary canal showing plainly, especially on the segments 

 towards the anus; anal plate was darker than the remainder 

 of the adjoining segments. 



On June 16th the larva entered into its third instar. It 

 had hitherto fed u[)on two birch leaves placed one upon the 

 other. It now discarded this method, and formed the usual 

 pocket which many species at least of this genus adopt, by 

 spinning a portion of the edge of a leaf and folding it over, 

 turning the under side of the leaf up, and feeding upon the 

 upper cuticle. It was now 6*5 mm. long, head very light amber- 

 coloured tinged with green, there was a jet-black spot on each 

 side of the mouth, on the front of the jaws there was a brown 

 patch, and behind this were two brown dots ; the head was 

 highly glabrous. 



The thoracic ])late was equally glabrous with the bead, and 

 of the same tinge of colour, but lighter; on each side at the 

 rear was a large and ])rominent black blotch. The colour of 

 the remainder of the segments was the same as in the previous 

 instar ; the tubercles were black and prominent, the alimentary 

 canal showed plainly, the anal plate was brown and glabrous, 

 the spiracles were black and prominent. The prolegs and claspers 

 were the same light green as the segments. 



On July 1st the larva was full grown, as far as 1 could 

 ascertain it was still in the third instar ; and I am pretty certain 



