_Biological Value of Colour_, p. 289.
General prevalence of protective colouring among caterpillars, 289.
Polymorphic adaptive colouring in _C. Elpenor_, _C. Porcellus_,
_P. Œnotheræ_, _D. Vespertilio_, _D. Galii_, _D. Livornica_, _D.
Hippophaës_, 295. Habit of concealment primary; its causes, 298.
Polymorphism does not here depend upon contemporaneous but upon
successive double adaptation; displacement of the old by a new
adaptation; proof in the cases of _D. Hippophaës_, _D. Galii_, _D.
Vespertilio_, _M. Stellatarum_, _C. Elpenor_, and _S. Convolvuli_, 300.