It is well known that the Sphingid rarely breed when thus treated.
The head is greyer than the body; the usual Sphingid horn is absent, and in its place there is a double wart.
Wallace, Dr., on the sterility of Sphingid hatched in autumn, ii.
Newman, E., sterility of Sphingid under certain conditions, ii.
The caterpillars of the Sphingid are known to behave themselves in different manners when attacked.
