6 PSYCHE [Februaiy 



VII. Conclusion. 



The futility of speculation and the importance of actual experiment are well 

 shown in the cases presented. ' The problems involved in the inter-relations of 

 these butterflies are of interest to all biologists. They can only be solved by 

 careful and long-continued investigation. 



At the Alstead laboratory the effort will be made during the coming summer 

 to breed hybrid Basilarchias in a large enclosure, with growing trees on which the 

 larvae may feed. Quantitative studies of variation in this genus are now under 

 way. It is hoped that before the close of the summer new light may be had upon 

 the questions here discussed. ' 



I am indebted to Messrs. A. P. Morse, H. H. Newcomb and A. C. Sampson 

 for the loan of specimens from their collections. 



BIBLIOGRAPHY. 



Edwards, W. H. 



1865. I'roc. Ent. Soc. Phila., 1865, p. 148. 



1867. Trans. Am. Ent. Soc, I., 286. 



1869. Butterflies of North America, I., Limenitis i. Boston and New York. 



1873. Can. Ent., V., 232. 



1877. Can. Ent., IX., 114. 



1879. Butterflies of North x\merica, II., Limenitis i. Boston and New York. 

 Grey, R. M. 



1879. Can. Ent., XI., 16. 

 Holland, W. J. 



1899. The Butterfly Book. New York. 



SCUDDER, S. H. 



1872. Sjst. rev. Am. butterflies. Rep. Peabodv Acad. Science. 

 1875. Bull. Buffalo Soc. Nat. Sc, II., 249. 



1889. The Butterflies of the Eastern United States and Canada, with speciaPreference to 

 New England. Cambridge. 

 Strecker, H. 



1878. Butterflies and Moths of Nortli .Vmerica. Diurnes. Reading, Pa. 



