91 
Male: fore wings fine clear orange-brown, mottled with 
grey, with a small patch of white at the inner corner, a 
black waved streak, margined on its inner side with 
white, across towards the middle ; at the centre, towards 
the upper margin, is a black Y, and beyond the middle 
another black waved streak, the second line margined on 
its outside with whitish. Hind wings grey or pale- 
brown, also several whitish strokes running into the outer 
margin, and a row of three white spots at the outer 
corner. 
The female is paler in colour, and the Y in the upper 
wing is more distinct, but the general markings are 
similar. 
Localities for this species are Rannoch, Bristol, Brighton, 
Preston, Ipswich, Lower Guiting, Horsham, Worcester, 
Monmouth, and St. Leonard’s Forest. 
The perfect insect appears in the early part of April. 
The caterpillar is pale-green, with a yellow line on the 
sides in front, ten slanting white strokes on each side of 
the back, and the sides dotted with black and ferruginous. 
The date of the appearance of the caterpillar is in July. 
It feeds on the birch, beech, lime, hazel, &c. 
This moth flies in the day-time, and is very quick and 
agile on the wing. 
SATURNIA CARPINI. 
EMPEROR MOTH. 
Plate XYI. Figure 3. 
This noble insect measures from about two inches 
and a quarter to a little over that width in the male, 
and from a little under to a little over two and three 
quarters in the female. 
