THE CANADIAN ENTOMOLOGIST. 25 



In 1873, Mr. G. R. Crotch collected a number of butterflies at Lake 

 Labache, in British Columbia, among which were a number of specimens 

 which Mr. Edwards seems to have regarded as Colias Philodice, as men- 

 tioned in Trans. Amer. Ent. Soc, v.. p. 15. Subsequently on page 202 

 of the same volume, he described these specimens as a new species under 

 the name of C. Eriphyle. 



In the same place he said that a Colias similar to this had been taken 

 by Mr. Mead, in Colorado, and by Dr. E. Coues, in Montana, and had 

 been referred to by Mr. Reakirt as Philodice, but was, he thought, nearer 

 to Eriphyle than to Philodice. The question now arises as to how these 

 discoveries affect the standing of other so-called species of Colias, for it 

 would seem that some of these forms are like children's tin soldiers set 

 near together, in which if you knock down one, a whole row is laid low. 



In But. N. A., vol I., plate 15, C. Eur y theme var. Keewaydin is ex- 

 cellently illustrated as a distinct species, as it was then believed to be by 

 a number of eminent entomologists, and one figure — No. 7 — depicts a 

 greenish-yellow form with rather pale margins, which is certainly strik- 

 ingly unlike the ordinary type of Keewaydin^ but which was believed by 

 Mr. Edwards to be merely a variety of that form. In the text, page 50, 

 it is described as follows : 



" Variety A. t . Upper side pale yellow with a very slight tinge of 

 orange on disk of primaries ; sometimes wholly without orange and then 

 uniform lemon yellow ; the marginal borders also very pale (Fig. j.) " 



On page 51 the following extract from a letter of Mr. Henry Edwards 

 is given : " I may notice that the flight of the new species is much more 

 rapid and varied than that of Eurythemc : * * that the only variety 



which appears in the latter is in the case of the albino female, while the 

 male of the new species is constantly subject to run into the lemon yellow 

 variety, which, however, is rarely so well defined as in the specimen I 

 send you." [Figured in plate.] 



Subsequently Mr. Edwards ascertained that Keewaydin was only a 

 form of Eury theme, as was also Ariadne, which had been described as a 

 distinct species in 1870, and he accordingly published in Part vii. of 

 second volume of But. N. A. (pi. 21, pp. 103-116) a very full account of 

 Eurythemc and its forms Keewaydin and Ariadne. 



In the course of this most interesting account he said : " It 

 ( Eurytheme) occupies with Philodice the whole of the United States and 



