65 



amphidusa but somewhat paler in color with costa rather broadly yel- 

 low. In his volume II of Butt. N. Am. Edwards again deals with 

 keewaydin figuring it on Colias PI. IV, Fig. 7, but this figure can 

 scarcely be distinguished from his figure of eurytheme on the same 

 plate except by its smaller size and certainly does not agree well with 

 his former figure. In the text to this plate he states that 'keewaydin 

 was originally separated as a species from examples received princi- 

 pally from Texas and Mississippi' and treats it as an early summer 

 form of ariadnc with eurytheme as a late fall generation ; from notes 

 he publishes received from Hy. Edwards it would seem that San 

 Francisco collectors were accustomed to refer to the true amphidusa 

 as eurytheme. We have a series of typical amphidusa from Siskiyou 

 Co., N. California, captured in June and July, and some specimens 

 cannot be separated from the type of keewaydin as figured by Edwards 

 in Volume I; in Southern California the same form occurs along with 

 eurytheme (ariadne) and intergrades. In Arizona and Texas the late 

 summer generation {eurytheme Edw.) as a rule is considerably larger 

 and the orange quite vivid, but specimens occur which are paler and 

 tend towards keezvaydin and in a long series of $ 's from Decatur, 

 111., taken in the early part of August, we have color forms ranging 

 from deep orange to quite pale yellow with only a slight orange suf- 

 fusion. It appears to us therefore that keewaydin Edw. represents 

 no definite race or generation but is rather a form, somewhat inter- 

 mediate between eurytheme and amphidusa, found flying with typical 

 specimens of these two forms wherever the species occurs and usually 

 most common in the early summer generation ; on the one hand it may 

 intergrade with eurytheme , many specimens showing only traces of 

 orange on the secondaries, and on the other hand it may approach 

 amphidusa in being almost entirely suffused with orange; the name 

 seems scarcely worthy of retention. 



With regard to the yellow forms it seems fairly well established 

 {vide Edwards, Can. Ent, XIX, 170) that in Colorado at least the 

 yellow form is polymorphic ; the early spring brood and apparently 

 occasional late fall specimens are distinguished by the narrower bor- 

 der on the primaries, smaller size and heavier sprinkled underside ; 

 these have been called autumnalis Ckll., the name being rather unfor- 

 tunately chosen as the form is only occasionally met with in the fall, 

 single specimens of the brood that would normally hibernate as pupae 

 emerging under favorable conditions earlier than usual. The second 

 brood of early summer is hageni Edw. of larger size and broader 



