122 BOTYS HYALINALIS. 



the mouth were visible, and an modulatory motion of 

 the whole body was set up, as if the larva was feeding 

 on whatever fluid remained in the egg-shell with it. 



The newly-hatched larva is glassy or translucent; 

 in about five weeks' time it has become greenish, with 

 black spots, and reminds one of the larva of 8 copula 

 olivalis ; at about the age of two months, when 9 or 

 10 mm. in length, they spin their hibernacula, which 

 are very tough flat cocoons of roundish outline, some 

 10 mm. in length by 7 or 8 mm. in width, and made 

 of thin but very close-woven pale grey silk; the larvse 

 during hibernation seem to become dingy, for the one 

 I examined was reddish-brown in colour, with the 

 spots large, prominent, and glittering; but as three- 

 fourths of my stock did not feed again in spring, 

 it may be this dingy colour which I noticed was not 

 the colour of health during the hibernating stage. 



After the last moult I made notes of the larva 

 at two dates; in April, just as it was beginning to feed 

 again, it was about 11 mm. long when at rest, 14 

 or 15 mm. when in motion, of shortish fat figure, 

 stoutest about the sixth and seventh segments, and 

 thence tapering dorsally in a curve to either end ; 

 colour all over dull opaque white ; head horny, pale 

 yellowish-brown, mouth darker brown, a small dark 

 spot on the top of each lobe ; the collar, Avhich covers 

 the whole of the back of the second segment, paler 

 than the head; the anal plate not distinguishable; the 

 usual dots small and black, placed on pale Indian-ink 

 warts, which glitter brilliantly ; the front pair of the 

 trapezoidals on each segment are on the largest warts, 

 which are in outline stumpy pear-shaped, having the 

 broad ends turned inwards towards one another, and 

 the blunt stems turned outwards and backwards ; the 

 hinder pair of trapezoidals are placed on paler and 

 narrower warts (growing broader in figure on the 

 hinder segments), which have their long diameter 

 placed transversely; each dot bears a pale brown 

 bristle; the dorsal vessel appears as an interrupted 



