Additional Experiments with Pyrameis carye (Lepid.)
Every experienced lepidopterist knows that localities in which there are extreme variations in temperatures tend to produce seasonal forms of certain species of butterflies. In my breeding experiments I find that the same thermic factor is operative in the production of aberrant forms : for example — butterfly larvae which have been raised in a cool environment, and after pupation are subjected to very hot temperature, produce the greatest percentage of aberrations.
"Additional Experiments with Pyrameis carye (Lepid.),"
Bulletin of the Southern California Academy of Sciences:
Available at: https://scholar.oxy.edu/scas/vol28/iss2/3