COLIAS IV. 
submitted to Mr. Edwards and be now concedes the polymorphism of this spe¬ 
cies. 
The summing up of these histories in the several districts is as follows: — 
I. In northern Colorado, where the summer is short, the species is but digo- 
neutic, the butterflies of the first brood appearing in June, and the second in 
July and August. Probably the species is here preserved by the survival of 
some of the last butterflies, which hybernate and deposit their eggs in spring. 
It is doubtful if the climatic conditions will permit the growth of larvm late in 
the season and their consequent hybernation. The species is restricted to Kee- 
w ay din and intergrades up to the paler variety of Eury theme, but a few individ¬ 
uals are taken which show a tendency to vary in the direction of Ariadne. (Var. 
B. Fig. 6.) If there be any hybernating larvae they would probably produce 
these individuals spoken of. 
II. In Illinois and Nebraska the species is trigoneutic, and many of the ear¬ 
liest brood are nearer Ariadne than Keewaydin, but the typical Ariadne does 
not appear. Some individuals of the last brood of butterflies survive the winter, 
and thus appear in early spring in company with the butterflies that have come 
from hybernating larvae, and consequently must breed with these. And inter¬ 
grades between the forms are the result, and such are to be found throughout 
the y eai. So that in Illinois and Nebraska, as in Colorado and probably through¬ 
out the northern range of the species, it is rather a variable than a polymor¬ 
phic species, and either form or any variety of either may appear from any one 
laying of eggs. 
III. In California, in the lowlands, the species is polygoneutic, either three or 
four brooded, the earliest brood, which flies in February and March, being 
Ariadne. Keewaydin forms the second brood, which flies in April, and this 
fonn is on the wing during the remainder of the season. Eury theme appears in 
July, is abundant in August and September. And Ariadne appears in 
localities at different periods throughout the summer, and apparently in such 
localities must form part of every brood. Keewaydin is the usual form through¬ 
out the season in the mountains and also in Oregon and on Vancouver’s Island, 
Eurytheme ■ being rare. And Ariadne is taken occasionally also in those districts! 
By which it appears that in the lowlands of California there is a strong disposi¬ 
tion towards polymorphism as distinguished from mere variableness, all the 
forms being present, and, moreover, that each in great degree is limited in its 
season. The surface of California is extremely varied, lofty mountains alternat¬ 
ing with narrow valleys, with corresponding differences of climate. Near San 
Francisco frost and snow are unknown, and there is every degree of climatic 
difference between this and a sub-boreal climate in one part or other of that 
