Recent Progress in the Study of Some North American Migrant Butterflies

Abstract

In 1930 I published in my book “The Migration of Butterflies” a summary of the available knowledge of the migrant butterflies of North America, including about thirty species of which the principal were the Monarch ( Danaus plexippus ), the Painted Lady ( Vanessa cardui ), the Migrant Yellow ( Catopsilia sennae ), the Southern White ( Pieris monuste) and the Snout Butterfly ( Libythea bachmanni ). Since that date a considerable amount of new information has been received or published and some older records have been found which were previously overlooked, so it seems desirable to review this new knowledge, to see how it bears out previous conclusions, and to show where are the many gaps in our information.