us interesting accounts are recorded. Many insects nor- of the species to lengthen the breeding season and to ex- they perish, supplying the milkweeds here and there with mally non-migratory also exceptionally congregate and mi- tend its range; and the prevailing winds at grate in vast swarms, and… … New Guinea, and over the Azores to Europe, Mo. Ent. Eep., p. 151), I wrote as follows: THE ARCHIPPUS BUTTERFLY. such spread necessarily indicating great pow- " It would be difficult to give any satisfac- er of long-sustained flight, since the milk- tory reason for this assembling together of weeds…
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