. The butterfly book;. Butterflies. The Life-History and Anatomy of Butterflies Fig, 27.— Chrysalis of Pier is' olera- cea (Riley). draws near, it is in many cases possible to discern through the thin, yet tough and hard, outer walls of the chrysalis the spots and colors on the wings of the insect. Duration of Pupal Lz/>. — Many butterflies remain in the chrys- alis stage only for a few weeks; others hibernate in this state, and in temperate climates a great many butterflies pass the winter as chrysalids. Where, as is sometimes the case, there are two or three generations or broods of a spe
. The butterfly book;. Butterflies. The Life-History and Anatomy of Butterflies Fig, 27.— Chrysalis of Pier is' olera- cea (Riley). draws near, it is in many cases possible to discern through the thin, yet tough and hard, outer walls of the chrysalis the spots and colors on the wings of the insect. Duration of Pupal Lz/>. — Many butterflies remain in the chrys- alis stage only for a few weeks; others hibernate in this state, and in temperate climates a great many butterflies pass the winter as chrysalids. Where, as is sometimes the case, there are two or three generations or broods of a species during the year, the life of one brood is generally longer than that of the others, because this brood is compelled to over- winter, or hibernate. There are a number of but- terflies known in temperate North America which have three broods: a spring brood, emerging from chrysalids which have overwintered; an early sum- mer brood; and a fall brood. The chrysalids in the latter two cases generally represent only a couple of weeks at most in the life of the insect. In tropical and semi-tropical countries many species re- main in the chrysalis form during the dry season, and emerge at the beginning of the rains, when vegetation is refreshed and new and tender growths occur in the forests. The Transformation from the Chrysalis to the Imago.—The perfectly developed insect is known technically as the imago. When the time of maturity in the chrysalis state has been reached, the coverings part in such a way as to allow of the escape of the perfect insect, which, as it comes forth, generally carries with it some suggestion of its caterpillar state in the lengthened abdomen, which it with apparent difficulty trails after it until it secures a hold upon some object from which it may depend while a process of development (which lasts generally a few hours) takes place pre- paratory to flight. The imago, as it first emerges, is provided with small, flaccid wings, which, to- gether
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