1910] Field — Basilarchia Proserpina 89 
regarded as extracted recessives (arthemis), due to the inter- 
breeding of southward-spreading heterozygotes (proserpina). 
Moreover, wherever either arthemis or astyanax mingles with 
the widely-distributed archippus, we should look carefully for 
further evidences of hybridization involving that species. 
Viewed thus, the Basilarchias of eastern North America consti- 
tute a group of unusual interest to students of organic evolution, 
and supply attractive material for experimental investigation. 
BIBLIOGRAPHY. 
Bateson, W. 
1909. Mendel’s Principles of Heredity. Cambridge, Eng. 
Davenport, C. B. 
1910. The imperfection of dominance and some of its consequences. 
Am. Nat., xliv, 129-135. 
Epwarps, W. H. 
1877. Notes on Limenitis proserpina and arthemis. Can. Ent., ix., 114. 
1879. Butterflies of North America, II, Limenitis I. Boston and 
New York. 
Fretp, W. L. W. 
1904. Problems in the genus Basilarchia. Psyche, xi, 1-6, 3 pl. 
Newcoms, H. H. 
1907. Description of a new variety of Limenitis ursula. Psyche, xiv, 
90-91, pl. 
Scupper, S. H. 
1889. The Butterflies of the Eastern United States and Canada, with 
special reference to New England. Cambridge. 
