COLIAS IV. 



Range. Now Occidenialis is found on Vancouver's near the sea-level, and thence 

 across the continent at low elevations to western Canada." 



I have thought it best, therefore, to give Chrysomelas as a species, for the 

 judgment of an experienced lepidopterist, familiar with both these butterflies in 

 life, is of weight. Whether there are two species or two forms of one species 

 must hereafter be determined by breeding from the egg. 



Mr. Scudder described the female of Occidentalis, Proc. Bost. Soc. Nat. Hist., 

 IX., 109, 1862, as white, with a greenish tint, with margins like those of C. 

 Eurytheme^ Boisd. It is said that three females were under view. This de- 

 scription does not cover the yellow female, an example of which is figured on 

 the Plate in Vol. I., but applies to the albino Fig. 5, which I now believe to be 

 Eurytheme, and quite out of place on that Plate. Dr. Hagen called attention to 

 this some years ago, and on examination I allow that he was right. Striking out 

 this albino, the true type of the female is represented by Figure 3. I have never 

 .seen an albino female Occidentalis or of Chrysomelas. 



