Daphniacea, differences between allied species and genera, 516.
Darwin, C., influence of external conditions of life, 59;
inheritance at corresponding periods, 63, 275, 431;
markings of butterflies, 101;
definition of eye-spots, 326;
adaptation in larvæ, 392;
correlation of growth, 516;
degeneration, 583;
adaptation, 589;
causes of sterility, 596;
limited variability, 656;
factors of variability, 676;
abrupt variations, 701.
Degeneration, 583;
phyletic, 611.
_Deilephila_, division of larvæ into groups, 199;
_D. Euphorbiæ_, 1st larval stage, 202;
2nd and 3rd stages, 203;
4th and 5th stages, 205;
_D. nicæa_, larva, 207;
_D. dahlii_, larva, 208;
_D. vespertilio_, larva, 209;
_D. Galii_, larva, 211;
5th stage, 213;
_D. livornica_, larva, 215;
_D. Zygophylli_, larva, 217;
_D. Hippophaës_, larva, 218, 650;
division of larvæ according to phyletic stages, 223;
genealogy of, 358;
_D. Galii_, larva rejected, 340;
_D. Euphorbia_, larva eaten, 340;
habits of larvæ and imagines, 412;
_D. Robertsi_, larva, 525.
Development;
of marking of Sphinx-larvæ, laws of, 274;
phyletic, of markings of _Sphingidæ_, 370;
unequal phyletic, 460.
Dimorphism and polymorphism;
of butterflies, 250;
of Sphinx-larvæ, 300;
of pupæ, 412.
Diptera, incongruences among, 488;
imaginal characters of, 488;
divisions of, 498.
Dodo, extinction of, 651.
Dohrn, A.;
on degeneration, 583;
on functional change, 590.
Dorfmeister, G.;
experiments with _A. levana_, 11.
Duponchel;
figures of larvæ referred to, 207, 208, 218, 253.
Duméril;
experiments with Axolotl, 555, 564, 566, 593;
characters of Axolotl, 375, 576.