Last fall I obtained a few eggs from a female L. proserpina, in Sept., while in the Catskills, and raised eight larvæ to hybernation, which took place after third moult. This spring I have carried four of these to maturity with the following results : 'fhe first chrysalis gave butterfly this morning (April 29th), a male arthemis. For some hours before the emergence the white band of arthemis was distinctly seen through the wing case. The second was but a few hours younger and during this afternoon has given proserpine male. I expected this, as here there was no white band on the wing case.