It is well known that the sphingid rarely breed when thus treated.
Wallace, Dr., on the sterility of sphingid hatched in autumn, ii.
Newman, E., sterility of sphingid under certain conditions, ii.
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.
The head is greyer than the body; the usual sphingid horn is absent, and in its place there is a double wart.
Their antenn, like those of the sphingid, are thickest beyond the middle, and those of the males are slightly ciliated or hairy.
After all these illustrations it can no longer remain doubtful that the oblique stripes of the sphingid are adaptive.
The caterpillars of the sphingid are known to behave themselves in different manners when attacked.
The caterpillars of the sphingid appear also in some cases to vary in a manner very suggestive of phytophagic influences.