50 
PIERIDM. 
red, except at the anterior part of the hind margins of the hind 
wings, where the fringe is pale yellow. The female has the wings 
pale greenish white, instead of yellow ; the black border is less 
sharply defined internally than in the male. PI. XI., 1. 
Times of Appeaeance. — July and August. 
Habitat. — Scandinavia, Eussia, Lapland, the Alps of Switzer- 
land, the Tyrol, and the Pyrenees. It is said also to occur on some 
of the Ehenish hills, and even to have been taken in Belgium, in 
the hilly districts of Namur and Luxembourg. It is essentially a 
mountain species, and may be seen very frequently in August on 
the passes of Switzerland. Besides these European localities it 
inhabits Northern Asia, and, like many other alpine species, may 
also be circumpolar, though in Kirby’s Catalogue there is a query 
as to its inhabiting Arctic America. 
Laeva green, dotted with black, and having stripes of yellow. 
The female of this species is, like most of those of the genus, 
dimorphic, but it departs from the general rule in having the 
normal form white, as described above. There is, however, a 
yellow form, which is found in the higher alps, and may possibly 
represent the original appearance of the insect ; this is the 
VAEIETY 
a. Werdandi, H.-S. Schmet. Eur. i. 41. It resembles the 
common form of the female, hut has the ground colour the 
same as the male, and bears traces of yellow spots upon the 
black border of the fore wings. PI. XL, 2. 
h. Lapponica, Stgr. This variety has the ground colour 
lighter than the type. The female has the black border of the fore 
wings traversed by five or six whitish lines running from within to 
the hind margin. It occurs in Lapland. 
2. C. Pelidne, Boisd. Icon. 8, 1-3; Sp. Gen. i. 644; H.-S. 
Schmet. Eur. i. f. 35, 30, 43, 44. — Anthijah, Stand. Cat. 
p. 5. — Sed Aiithyide, Hilb. alia est species. 
Smaller than the preceding, having an expanse of from 1-50 
to 1-75 in. The colour of the male is greenish yellow, and the 
