118 ACIDALIA MANCUNIATA. 
have no dark spots, except a slight indication of them 
onthe tenth segment only. 
A blackish-brown line on the spiracular region ex- 
tends between the tenth and thirteenth segments. 
The full-fed larva was figured on the 15th July, and 
on the 20th it changed, on the surface of the earth, to 
a very slender dark blackish-brown pupa, the tail of 
which was turned backwards. 
The moth appeared on the 9th of August. (Wilham 
Buckler; .M.M., January, 1866, II, 189.) 
ACIDALIA IMMUTATA. 
Plate CXIX, fig. 1. 
I received eges of this species from Dr. Knages on 
the 18th July, 1863, and the larve: hatched on July 
22nd. They chose for their food Polygonum aviculare, 
but did not attain any great size before hybernation ; 
through the winter they rested on the withered stems 
of their food-plant, and did not begin to feed again in 
spring till the young seedlings of the Polygonwm had 
put out their second pair of leaves, when they seemed 
to find out that it was time to commence to eat again. 
They attained their full growth during the last week 
in May and the first week in June of the present 
summer, and spun themselves up in silken cocoons 
under some short moss which had grown upon the 
surface of the earth in their flower-pot. The first 
moth emerged on the 2nd of July, 1864. 
When full-grown the larva is about an inch and an 
eighth long. In shape it is cylindrical, slightly puffed 
at the spiracles, tapering evenly towards the head, 
which is small and round; the whole skin is ribbed in 
rings which go quite round the body. The ground 
colour 18 a warm stone-coloured tint, and there is a 
dusky dorsal line forming two small dots at each seg- 
mental division ; above the spiracles an irregular double 
dusky line; spiracles black, placed in a stripe rather 
