levana

Here again by refrigerating the summer pupae, butterflies were reared most of which approached the winter pattern, but it was impossible by heating the winter pupae to change _levana_ into _prorsa_.

The Life-Story of Insects 1902

Weismann experimented also with a small vanessid butterfly, _Araschnia levana_, common on the European continent, though unknown in our islands, which is double (or at times treble) brooded, its spring form (_levana_) alternating with a larger and more brightly coloured summer form (_prorsa_).

The Life-Story of Insects 1902

_Vanessa levana_ and _Vanessa prorsa_, transformation of, 72

Evolution créatrice. English Henri Bergson 1900

Before this, the already old experiments of Dorfmeister had shown that the same chrysalis, according as it was submitted to cold or heat, gave rise to very different butterflies, which had long been regarded as independent species, _Vanessa levana_ and _Vanessa prorsa_: an intermediate temperature produces an intermediate form.

Evolution créatrice. English Henri Bergson 1900