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The hybrids hibernated in the pupa state. Roylei, as Pernyi, hibernates in the pupa state. In the November number, 1881, of "The Entomologist," Mr. W.F. Kirby, of the British Museum, wrote an article having for its title, "Hermaphrodite-hybrid Sphingidae," in which, referring to hybrids of Smerinthus ocellatus and populi, he says that hermaphroditism is the usual character of such hybrids.
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