Genus Colias 
Early Stages. —Little is as yet known of these. 
The species was first found by Professor Louis Agassiz on the 
north shore of Lake Superior. It ranges through a rather narrow 
belt of country, through Quebec, Ontario, and westward to the 
Rocky Mountains north of the valley of the St. Lawrence and the 
Great Lakes. 
(8) Colias scudderi, Reakirt, Plate XXXV, Fig. 8, $ ; Fig. 9, 
9 (Scudder’s Sulphur). 
Butterfly.— The male on the upper side is colored like C. philo- 
dice, but the black borders are much wider. The fringes are 
rosy. The female is generally white,-—very rarely slightly yel¬ 
low,— with very pale dark borders, or often without any trace 
of black on the outer margin of the wings. On the under side 
the apex of the fore wings and the entire surface of the hind 
wings are greenish-gray. The discal spot of the secondaries is well 
silvered and margined with pale red. Expanse, 1.80-2.00 inches. 
Early Stages. —We know but little of these, except that the 
caterpillar feeds on the leaves of the huckleberry and the willow. 
Scudder’s Sulphur is found in Colorado, Utah, Montana, and 
British Columbia. 
(9) Colias pelidne, Boisduval, Plate XXXV, Fig. 14, $ ; 
Plate XXXVI, Fig. 15, 6 ; Fig. 16, $ (The Labrador Sulphur). 
Butterfly. —The male on the upper side is pale yellow, with a 
greenish tinge on the hind wings; the black borders are narrow; the 
fringes are pink. The female on the upper side is white, with very 
little or no black on the outer borders, the black marking being con¬ 
fined to the apex of the fore wings. On the under side the wings are 
much as in C. interior , and it is possible that the two forms are 
varieties of one and the same species. Expanse, 1.60-1.85 inch. 
Early Stages. —Little is known of these. 
Pelidne is rather abundant in Labrador at the proper season, 
and ranges thence westward and northward in boreal America. 
(10) Colias nastes, Boisduval, Plate XXXVI, Fig. 11, $ ; 
Fig. 12, $ (The Arctic Sulphur). 
Butterfly.— Easily recognized in both sexes by the pale-green¬ 
ish tint of the wings and the tendency of the outer border of the 
fore wings of the male to become divided, like those of the female, 
by a band of pale spots. Expanse, 1.50-1.65 inch. 
Early Stages. —Unknown. 
This is an arctic species, which is found in Labrador, Green- 
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