ng accounts are recorded. Many insects nor- dreds of miles, keeping principally to the north, and, ere of the species to lengthen the breeding season and to ex- mally non-migratory also exceptionally congregate and mi- they perish, supplying the milkweeds here and there with tend its range; and the… … er of long-sustained flight, since the milk- tory reason for this assembling together of weeds are not plants of commercial value, and it is highly eggs. A fresh brood is produced in less than a month, and such immense swarms of butterflies. There improbable that the species has been carried in any…
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