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Article Title

Additional Experiments with Pyrameis carye (Lepid.)

Volume

28

Issue

2

First Page

20

Last Page

21

Abstract

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.

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