ACIDALIA MARGINEPUNOCTATA. 1138 
brown. They were fed on Polygonum aviculare, and 
crew slowly until autumn, when they hybernated, and 
recommenced feeding early in March of the year 1874. 
A great many of them died during winter and spring, 
and at the end of May I had only four left. These 
were nearly full-grown on the 18th of June, when Il 
described them as follows: 
Leneth about an inch, and rather slender; head 
rather narrower than the second segment, and deeply 
notched on the crown; the body is rounded beneath, 
but rather flattened above, not so conspicuously, how- 
ever, as in some other Acidalia larve ; the 2nd, 8rd, 
and 4th segments are the narrowest, and are of about 
equal width; from the fourth they gradually become 
wider until the 10th, which is the widest segment, is 
reached; the llth, 12th, and 18th are of about equal 
width, but narrower than the 10th. The segments 
overlap each other, rendering the divisions distinct, 
and, as in other species of the genus, each segment is 
conspicuously ribbed transversely ; the skin has a tough 
appearance. : 
The ground colour of the dorsal surface is pale 
slaty-grey ; the head is grey, with the sides and the 
notch dividing the lobes dark brown; medio-dorsal 
line very narrow and pale, edged on each side in the 
centre of the 5th, 6th, 7th, 8th, 9th, and 10th segments 
with a narrow black streak; on the other segments 
the black edging is continuous, but narrower and 
much less distinct. Onthe middle segments, between 
the medio-dorsal and subdorsal lines, is another series 
of very black streaks, and these, being situated nearer 
the subdorsal region than the edging of the dorsal 
line, give the dorsal surface a very pretty variegated 
appearance. The subdorsal lines are of a very indis- 
tinct pale slate-colour ; the spiracular lines are scarcely 
perceptible even with a lens. ‘The ventral surface is 
of a uniform pale slate-colour, with a very narrow 
indistinct paler central line, and equally indistinct 
transverse waved longitudinal lines. 
VOL. VII. 8 
