PTEROSTOMA PALPINA. 155 



more or less partial, leaving some of the pupae to go 

 through the winter with those of the next generation. 



In 1886, August 24th, Mr. Harwood sent me a larva 

 on sallow, full-fed, which began to spin next day; 

 September 22nd Mr. Gr. T. Porritt sent me some larvae, 

 one of them in its last moult. 



I have no description of the egg 9 or young larva ; 

 only a note that it fed away on a sallow leaf, eating 

 both sides to the midrib, which it left untouched, and 

 used as a resting place. The last moult was passed 

 when the larva was 22 mm. long, the previous appear- 

 ance had not differed much from the new coat. The 

 full-fed larva was full 30 mm. in length, stout and stiff 

 in figure, tapering a little forward from segment 8 ; 

 segment 13 sloping rapidly; head smaller than any other 

 segment, its lobes rounded at top, flattish in front; 

 skin much wrinkled transversely, apparently six folds 

 in each segment; in colour very pale bluish-green, the 

 middle of the back of the ground colour, on either side 

 of this a stout opaque white line beginning on the head, 

 below this a similar but narrower subdorsal line ; these 

 four lines, which look raised and warty as it were, 

 converge, but do not meet on the anal flap ; above the 

 spiracles a line, which is white on the front of each 

 segment and yellow on the hinder part, and is very 

 distinctly, but very finely, edged above with black, and 

 on segments 2 — 4 bears some lilac spots ; this line ends 

 under the anal flap in two blunt points ; the head green, 

 its lobes edged white on their inner outline; the 

 spiracles whitish ; the skin of the belly wrinkled, but 

 glossy, and of a fuller green colour than the back. 

 The larva spins a weak cocoon of greyish silk amongst 

 loose earth, but not so much coated with earth as the 

 cocoons of some other species. The pupa 18 mm. long, 

 stout, cylindrical, back of thorax rounded, head a little 

 produced, abdomen somewhat tapering, segmental 

 divisions well cut, tail diminishing in a curve with 

 rounded end, having a short curved blunt spike just 

 1 mm. long, much wrinkled, and set with four points, 



