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Their antenn�, like those of the Sphingid�, are thickest beyond the middle, and those of the males are slightly ciliated or hairy.

The larv� of the Sphingid� are large and smooth, and most of them have a horn projecting from the top of the last segment but one.

Wallace, Dr., on the sterility of Sphingid� hatched in autumn, ii.

Newman, E., sterility of Sphingid� under certain conditions, ii.

Sphingid�, sterility of, in captivity, ii.