William Bateson,
Problems of Genetics
“ This species has the conspicuous white bands across both wings like our sibylla.There is also a more Southern type known as astyanax, which is very different in its appearance, being without the white bands and having a broad irroration of blue scales on the posterior border of the hind wings. The two are so distinct that one would not be tempted to suspect any very close relation between them. In its distribution astyanax is described by Field as replacing arthemis south of latitude 42°. About Boston it is much more common than arthemis. ”
