He generally used the chrysalids of the Papilio Turnus, whose females are dimorphic, that is, having two distinct forms.
"Slippy McGee, Sometimes Known as the Butterfly Man"
Marie Conway Oemler
Some entomologists have thought them simply varieties or dimorphic forms while others have considered them hybrids.
"Butterflies Worth Knowing"
Clarence M. Weed
As is the case with so many other butterflies there is a dimorphic form, called ocellata, in which the outer half of the hind wing is very dark brown, with the eye-spot showing as black with red-brown circles.
"Butterflies Worth Knowing"
Clarence M. Weed