PLATE IL. 
No. 1.—The Clouded Yellow Butterfly (Colias Edusa). No. 6.—The Chrysalis of the Clouded Yellow Butter- 
No. 2.—The Female of the Clouded Yellow Butter- fly. 
fly. No. 7.—The Pale Clouded Yellow Butterfly (Colias 
No. 3.—The Under side of the Clouded Yellow Hyale). 
Butterfly. No. 8.—The Female of the Pale Clouded Yellow 
No. 4.—A variety of the Clouded Yellow Butterfly. Butterfly. 
No. 5.—The Caterpillar of the Clouded Yellow Butter- No. 9.—The Caterpillar of the Pale Clouded Yellow 
fly. Butterfly. 
THE Genus Colias. The insects contained in this genus are more robust, both in the texture 
of the wings and the dimensions of the body, than the preceding, from which they are also 
distinguished by the rounded apex of the anterior wings, the deep black bordering of which 
forms another distinctive feature. The antenne are short, rather thick, and swelling gradually 
into the final club or knob. The Caterpillar is naked, somewhat elongate, and tubercled. The 
Chrysalis is rather short, and at the head somewhat hooked in a beak-like form; it is sus- 
pended by a girth of web, and attached at the tail by a knob of the same substance. The name 
was conferred by Fabricius, who, in this instance, following the system of Linnzeus, gave an 
arbitrary one, a surname of Aphrodite, the Greek Venus, who had a statue on the Attic promon- 
tory of Colias. ; 
-Colias Edusa (the Clouded Yellow, No. 1), is one of our handsomest Butterflies, the fine 
contrast of its black and orange markings having probably suggested to Fabricius the idea of 
selecting one of the titles of the goddess of beauty as the name of the genus. It is very 
common in some seasons in this country, but in others comparatively rare. Its abundance once 
in three or four years has not been satisfactorily explained. The Caterpillar (No. 5), is found 
in the spring feeding on different plants of the trefoil family, and the perfect insect appears 
later in August, frequenting lucern and clover fields, and is sometimes seen as late as October, 
at which time the sunny side of railway banks is said to be one of its favourite resorts. Bem- 
bridge, Isle of Wight, Blandford, Brighton, Plymouth, Teignmouth, Winchester, &c., are 
named as good localities for the capture of this handsome insect. 
The female (No. 2) is generally rather larger than the male; is of a somewhat clearer 
orange, and is also distinguished by bright yellow dashes in the black border. The under side 
of the male (No. 3) is almost exactly similar to that of the female, though so different on the 
upper side, both being remarkable for the spot of silver in the centre of the circlet in the hind 
wings. 
No. 4 is a striking variety of the female, of not uncommon occurrence, in which the whole 
of the orange and yellow tones are suffused with a pervading tone of bluish gray, which gives 
rather a green tone to the hind wings. The chrysalis is represented in No. 6. 
Colias Hyale (the Pale Clouded Yellow, No. 7), is a very distinct species, and much more 
rare than C, Edusa. Its wings are of very chaste and delicate colouring, which may have 
suggested to Linneus its specific designation of Hyale, one of the nymphs of Diana, for it 
figures under that name in his great division Papilio. The pervading colour of the male is a 
