COLIAS V. 
in 1854. The Report mentions, “C. Eurydice, the most beautiful of all known Co- 
liades, haying the size and form of Ccesonia, with much the same design; but in this 
brilliant species the yellow is replaced by a vivid orange and the fore wings have 
a violet reflection” and “ Rhodocera Lorquini, which has nearly the form of our 
Rhamni, with the hind wings a little less angular and a black spot upon the mid- 
dle of the fore wings.” 
The Lorquini has proved to be the female of Eurydice, connecting the genera 
of Colias and Gonepteryx (Rhodocera) in a remarkable manner. 
Mr. Henry Edwards writes me of this species. “This insect is too rare for us 
to make many observations upon it. It appears to be very local, its chief home being 
in Marin Co. about 25 or 30 miles from San Francisco. I have also heard of it 
near Sacramento and have occasionally seen it flying in the streets of this city (San 
Francisco) . It appears in May, the female being sometimes found as late as Au- 
gust. Its flight is very rapid and wild and it is exceedingly difficult to capture. 
I have seen it alight on the flowers of thistle, but only for a few moments and then 
away to some considerable distance. The collector who is fortunate enough to se- 
cure a good male has indeed a prize. The female is more common and is more 
readily captured. I have heard of certain years in which this species has been com- 
mon, so that, like many other butterflies, it may appear periodically in considera- 
ble numbers.” 
