COLIAS IV. 
San Francisco, and in October some fine examples were brought from Yo Semite 
by Mr. Mead. I have previously alluded to the tendency to hybridization dis¬ 
played by the species of this genus, and may here relate my experience therein. 
In July, 1874, while staying at the Big Tree Grove, Calaveras County, I took a 
9 and J Colias in coitu. The female was a small, pale-colored, narrow-bordered 
Ariadne , and the male a rich, deep orange, broad-bordered Eurytheme. Some 
few days after, the exact opposite occurred to me. This time the female was a 
rich orange Eurytlieme, and the male a small, pale yellow, faintly marked Ari¬ 
adne. It can hardly be that the large, deep orange Eurytheme, and the pale 
yellow and fragile-looking Ariadne can be one and the same thing, linked to¬ 
gether by Keewaydin and a series of intergrading forms; but it would be dif¬ 
ficult to arrive at any other conclusion, unless, as I have stated, the above- 
mentioned instances are regarded as cases of hybridism. Mr. Edwards gives 
time and locality for Ariadne as follows : in Marin and other counties, February 
and March; Big Trees, July ; Virginia City, Nevada, July ; Yo Semite, July 
and October. 
In reply to inquiries Mr. Edwards writes me thus, March, 1878: Early in the 
year, in the warm days of March and April, I take many hybernated examples 
of Eurytheme and Keewaydin, the former being most abundant. This refers to 
the immediate neighborhood of San Francisco, that is, to the lowlands. May is 
the first spring month of the mountains, at six or seven thousand feet elevation, 
and I have there taken hybernated Keewaydin, but have never seen Eurytheme 
in the mountains in the same condition. I find fresh examples of Keewaydin, 
about San Francisco, in March, but none of Eurytheme, nor have I ever taken 
fresh examples of the latter form before July, and in no quantities till August 
or September. I saw plenty of Keewaydin on Vancouver’s Island, but no Eury¬ 
theme, and even in Oregon the latter is very rare. Its home appears to be 
within a couple of hundred miles north and south of this city. But Keewaydin 
is everywhere from San Diego to Vancouver’s, where, as well as m Oregon, it is 
the commonest of species. 
“ Ariadne is rather abundant about Sancelito (near San Francisco), on some 
hills from seven to eight hundred feet above the sea, as early as February. ^ As 
far as I know, from my own experience, it is never found in the lowlands in fresh 
condition except in early spring. As we go further north, that is, to Oregon 
and Vancouver’s Island, it is found in June and July, and in the Yo Semite Valley 
— four thousand feet —it flies as late as October. I have, therefore, always be¬ 
lieved that this form was two-brooded, the June race in Oregon being equal to 
the February and March race here, and the June race of San Diego being equal 
to the October one of Yo Semite.” I may add here that my manuscript was 
