WITH FURTHER HISTORIES. 177 



Her and a later form,Walshii and Telamonides, so 

 this blue butterfly is dimorphic in the northern 

 part of its range, appearing as an earlier and a 

 later form, Lucia and violacea. Additional proof 

 will be found on tracing still farther the history 

 of this butterfly in New England. Shortly after 

 the appearance of violacea, or about the middle of 

 May, we encounter another blue butterfly, too 

 early to have been produced from violacea, just 

 as violacea appeared too soon to have been pro- 

 duced from Lucia. This blue corresponds in all 

 respects excepting size with Pseudargiolus proper 

 of the south ; and small southern individuals 

 agree altogether with large northern examples. 

 Now in the south Pseudargiolus has been reared 

 from violacea ; but here, the earlier individuals 

 must be the offspring of Lucia, or the entire 

 brood the common progeny of Lucia-violacea. 



As we go still farther north, the spring brood 

 is the only one which persists, and it is even 

 made up entirely of the earliest New England 

 form, viz., Lucia. At the two latitudinal ex- 

 tremes of its range, therefore, this butterfly ap- 

 pears under a totally different aspect, and has a 

 different history. Without a study of their ap- 

 pearance and history in intermediate localities, no 

 naturalist would have hesitated to class them as 

 perfectly distinct species. 



In addition to this curious polymorphism, de- 



