100 r October, 



colour, and so transparent that the development of the larvae within 

 could be plainly watched ; thus, in about a week the eyes could be 

 seen, and in two or three days more the organs o£ the mouth were 

 visible, and an undulatory 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 S. oUvalis ; 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 ex- 

 amined 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 segments six and 

 seven, 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, 

 which covers the whole of the back of the second segment, paler than ,^ 

 the head ; anal plate not distinguishable ; the usual dots small and 

 black, placed on pale Indian-ink warts, which glitter brilliantly ; tht 

 front pair of the trapezoidals on each segment are on the largesi 

 warts, which are in outline stumpy pear-shaped, having the broad ends 

 turned inwards towards one another, and the blunt stems pointed out 

 wards and backwards ; the hinder pair of trapezoidals are placed oi 

 paler and narrower warts (growing broader in figure on the hindei , 

 segments), which have their long diameter placed transversely ; eacJ : 

 dot bears a pale brown bristle ; the dorsal vessel appears as an in ; 

 terrupted fine brown thread on the latter half of each segment, an 

 there is a little transverse streak of the same tint at each segment? 

 division, and also at the middle wrinkle of each segment ; the spiracle i 

 appear of the ground colour ringed with brown. 



Early in May the full grown larva is about 16 mm. long when i >. 

 rest, and quite 22 mm. when extended in walking, 3 mm. wide i. 

 segment seven, where it is stoutest ; the colour is still dull opaqi: • 

 white, with perhaps the faintest tinge of green ; the dorsal regie 

 with a faint shade of black from tke internal vessels ; the head vei, l , 



