88 ACIDALIA RUBRICATA, 
margin of the fore-wings of Chervcampa elpenor, only 
it is brighter. 
The larva when full-fed is not quite an inch in 
length ; in shape rather slender, tapering towards the 
head; the head itself is notched, having the lobes 
rounded and swelling out wider than the second 
segment; the whole body is ribbed with transverse 
rings. ‘lhe ground colour is grey or ochreous on the 
back, paler on the belly. The dorsal line is composed 
of two very fine dusky threads; there is a thicker and 
darker subdorsal line, commencing on each lobe of 
the head, and vanishing again after the fourth seg- 
ment, and as far as this extends there is between it 
and the dorsal line a pale grey stripe; on the next 
five segments both these subdorsal lines reappear only 
as light or black spots at the segmental divisions, 
while on the back of the same segments there are five 
elongated dusky lozenges faintly edged with black ; 
the remaining segments are paler both in ground 
colour and in distinctness of lines. The spiracles are 
black, placed in a drab longitudinal ridge, which is 
bordered above by a fine black line, and below by a 
wider one. 
All the dark lines and marks become much fainter 
as the larva approaches its final change. 
The pupa is apparently placed in a slight cocoon 
under moss; but, as I am hoping to get out another 
moth, I have not disturbed the cage to describe it. 
The larva is very similar in figure, tints, and habits 
to many others of the same genus (twisting itself 
when disturbed into almost a double coil); but the 
eye at once catches, as the chief point of distinction, 
the shape and colour of the head. (John Hellins, 
13th July, 1865; E.M.M., August, 1865, II, 66.) 
On the 18th of August, 1870, I received, through 
the kindness of the Rev. John Hellins, a young larva 
of this species. It fed on Polygonum aviculare, grow- 
ing slowly until the early part of October, when it 
