178 PURPLF V.MPEROR. 



ditional while spots towards the outer extremity 

 of the upper wings. In both sexes there are four 

 macular patches of white on the upper wings, the 

 two outermost consisting of two small spots each, 

 the twa innermost more continuous* but somewhat 

 curved and interrupted at the nervures. The largest 

 of these patches is placed in a line with a bar of 

 white, which traverses the under wings in an oblique 

 direction, emitting a salient angle near the middfe of 

 its outer edge. Midway between this band and a 

 pale tawny streak which circumscribes the wings not 

 far from the margin, there is a round black spot sur- 

 rounded by a ring of ochve-red : a streak of the lat- 

 ter colour is also observable at the anal angle, and on 

 the extremity of the adjoining nervure. On the under 

 side, the upper wings are rust-brown, inclining to 

 black in the middle, with a large ocellus towards the 

 hinder angle, and two black spots not far from the 

 base, in addition to the white marks corresponding 

 to those on the upper side ; the under wings have 

 the transverse white band rather broader than above, 

 and the ocellus appears smaller ; the base and hinder 

 portion are greyish, with something of a pearly lustre, 

 and a faint undulating brown line runs along the 

 margin. The body is black above, the under side 

 and legs greyish-white. 



Both the caterpillar and chrysalis are pale green ; 

 the horns of the former reddish at the tip, and hav- 

 ing a yellow stripe down the outer side It feeds 

 on the comnaon sallow and oak. 



