PIKHINAE: KUUYMUS EURYTHEME. 1135 



mules are elirome yellow over l)Otli wings aiul have a very unitbrm shade, 

 while the October males are of" a pale color, a whitish yellow, and the hind 

 wings densely dusted with gray. Similar diti'ercnees appear upon the 

 under side. 



In Illinois and Nebraska again the species, according to Edwards, is 

 trigoneutic, but whether eriphyle occurs here does not appear from his 

 statements. The typical ariadne, however, does not a|)pcar, though many 

 of the early broods are nearer ariaduc than keewaydin. Here, according 

 to Edwards, the species is rather a variable one, like E. philodice, than a 

 ])olymorphic species, and "either form or any variety of either may appear 

 from any one laying of eggs." 



In Cidifornia the admixture is greater probably than anywhere else. 

 For in the lowlands the southern yellow form penetrates as far north as 

 Vancouver Island, while on the higher ground the northern yellow form, 

 eriphyle, penetrates as far south as San Bcrnadino. In the lowlands, ac- 

 cording to the two Messrs. Edwards, the earliest brood, which flies in 

 Fel)ruary and March is ariadne ; the second brood, keewaydin, flies in 

 April and continues on the wing throughout the remainder of the season. 

 Eriphyle appears in July and is abundant in August and September, and 

 ariadne again forms, in certain localities at least, a part of every brood. 

 So far as I can discover, eriphyle also appears here to a certain extent 

 throughout the year ; but perhaps, as with ariadne, its abundance is con- 

 fined to the early and late season. 



In addition to this great diversity of forms, which vary in different regions 

 of the distribution of the species, a further element of variation appears in an 

 intensified antigeny. The females of at least the later broods (it does not 

 appear that this has yet been discovered in any females of the types 

 ariadne and eriphyle) not infrequently have the same pallid hue that we 

 find in the allied form, E. philodice pallidice, and which is a permanent 

 feature in the female of some other types of Eurymus. 



To sum up, then, we may say that the polymorphism of this species ex- 

 hibits itself in seasonal distinctions in all the broods excepting the succes- 

 sive broods of the warmer part of the year in the more southern regions, 

 the first brood showing so little orange upon the wings as to closely 

 resemble the allied species E. philodice and itself presenting marked dif- 

 ferences in the northern and southern extremities of its range ; the second 

 brood of a pale orange intensified in the disk of the wings, and the third 

 and later broods, when there are any, of deep orange. Further, that in 

 some parts of its range, these distinctions are well marked, while in others the 

 type characteristic of the earlier broods may reappear in any of the subse- 

 quent ones, and especially toward the close of the year, with the advent ofthe 

 cold season, the spring type may reappear in considerable force. Finally, 

 that in mountainous regions or their near vicinity there is an excessive in- 



