68 HYRIA AURORARIA. 
In August, 1865, Mr. Batty, of Sheffield, sent me 
some young larvae, which were then, and continued 
afterwards, of a very dark variety. In 1866, Mr. 
T. Brown, of Cambridge, sent me some eggs, the 
larvee from which were very much paler than the 
former brood. I find the following dates recorded in 
my note-book:—Larve hatched July 12th; about 
half an inch long in October; began to feed after 
hybernation about the end of February; full-fed about 
the beginning of June; moths bred during the first 
half of July. 
These larve fed on Polygonwm aviculare, and, 
although very much of the Acidalia form and habit, 
did not, as many species of that genus do, show any 
preference for withered leaves over fresh. All, save 
one of the Sheffield brood, died during the winter of 
1865-6, whilst, as far as I could see, the much sharper. 
frost of last winter made no impression on the Cam- 
bridge brood, which fed up well, though about a third 
of their number died in the final change. 
The Sheffield larve, when small, were very dark 
brown—almost black—all over, but with a lens a 
slightly paler subdorsal line could be discovered, as 
well as some black dorsal central spots placed in a 
slightly paler space. The Cambridge larva, whilst 
small, came near to the Manual description, for they 
were then dusky brown, with the anterior segments 
pale ochreous on the back, and the middle segments 
having pale diamond marks enclosing a central dusky 
spot; but the full-grown appearance was quite 
different. 
When full-grown the larva is about three-quarters 
of an inch long, slender, rather flattened along the 
spiracles, tapering towards the head, which is small 
and bifid; the skin a lttle wrinkled; in fact, it is a 
slender form of the shorter (or aversata) type of Acidalia. 
The ground colour either brown or very pale grey ; 
in either case the anterior and posterior segments are 
much tinged with ochreous; a dark, blackish, double 
