idopterous families, 435;

in Lepidopterous genera, 444.

ConiferÆ, food-plants of Anceryx, 268.

Convergence of characters in Ophiuroidea, 396;

in Dipterous larvÆ, 494.

Cope, Prof., habits of Siredon Mexicanus, 566;

on distribution of Amblystoma, 569.

Correlation of growth, 278, 363, 388, 415;

action of, 415, 516;

Von Hartmann’s views of, 670;

nature of, 673.

Cryptobranchus, characters of, 579.

Cyclical propagation, 82, 699;

and reversion, 613.

D.

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, 458, 502;

in Hymenoptera, 481;

in Diptera, 488;

different forms of, 503;

dependent upon action of environment, 505, 507, 508.

Inheritance; homochronic, 63, 431;

definition of cyclical, 66;

limited by sex, 68.

Insects, ancestry of, 493.

Intermaxillary gland of Axolotl, 623.

J.

Jullien, on Lissotriton punctatus, 591.

K.

Kant, referred to, 638, 709.

Kirby, W.F., “Synonymic Catalogue” referred to, 2, 49, 435, 449.

Kleemann, larva of S. Ligustri, 259.

Knaggs, Dr. H.G., seasonal dimorphism of S. illustraria, 4.

KÖlliker, Prof., experiments with Axolotl, 564;

characters of Axolotl, 575.

L.

Lacerta muralis, colour variations, 361.

Lake of Mexico, 603, 608, 621.

Lange, F.A., “History of Materialism” referred to, 645, 656.

Langer, Prof., experiments with Pelobates tadpoles, 607.

Lankester, Prof. E.R., on degeneration, 583.

Lasiocampa Pini, larva eaten by lizards, 336;

variable in two stages, 405.

Lepidoptera; foes, 8;

larva and imago independently variable, 401;

species constant in three stages, 405;

species variable in three stages, 405;

variable in two stages, 405;

variable in one stage, 406;

causes of variability of pupÆ, 411;

case of incongruence among pupÆ, 540.

Leptodora hyalina, development, 93.

Lepus timidus, white variations of, 662.

Leuckart, reproduction of Ascaris nigrovenosa, 90;

on growth, 654.

Leydig, on sexual larvÆ of Triton, 591.

Limenitis Artemis and L. Proserpina, dimorphic in both sexes, 32;

L. Camilla, constant in three stages, 405.

Lines, dorsal, subdorsal, supra- and infra-spiracular, 175.

Lissotriton punctatus, sexual larvÆ, 591, 595.

Lizards, colour variation of, 361;

rejection of caterpillars by, 336.

Local forms, distinct from climatic varieties, 45;

produced by isolation, 109.

Lockyer, B., young Noctua larvÆ, 166.

Lophostethus Dumolinii, larva, 290.

Sterility, causes of, 596;

a result of reversion, 597;

law of, in reversion forms, 599.

Stoat, seasonal change of colour, 7.

Strauch, “Revision of SalamandridÆ” referred to, 570, 577.

Strecker, H., N. American species of Smerinthus, 453.

Stripes, longitudinal, 312, 372;

oblique, 317, 373.

T.

Tadpoles, arrested development, 607.

Tegetmeier, W.B., metamorphosis of Siredon, 566.

Teleology and Mechanism, 694.

Terebrantia, larvÆ, 508.

Transformation, causes of, 460, 496;

factors of, 676.

Trematoda, alternation of generations in, 83.

Trimen, Roland;

larva of Lopho. Dumolinii, 527;

of Ch. Capensis, 529;

phytophagic variability of larva of Ach. Atropos, 531.

Triptogon roseipennis, larva, 244.

Triton;

T. alpestris, sexual larva, 585;

reproductive larvÆ, 590.

Degeneration in genus, 612.

Species of Upper Engadine, 631.

Typical parts, modified by environment, 501, 513.

U.

Upper Engadine;

Amphibia, 615;

climate, 616;

frog from, 618;

Tritons of, 631.

Urea, synthesis of, 643.

V.

Vanessa.

V. UrticÆ, climatic variation, 60;

V. Atalanta, UrticÆ, and polychloros, variable in two stages, 405;

V. Io, variable in one stage, 407.

Congruence and incongruence in genus, 446;

phyletic completeness of, 447;

arrangement of spines on larvÆ, 448.

Variability, origin, 107;

limited, 114, 362, 653, 655;

independent in different stages, 402;

definition of, 404;

a relative term, 408;

causes of, in pupÆ, 411;

primary and secondary, 416;

independent in different larval stages, 416;

phytophagic, 305, 531;

Von Hartmann’s views, 646;

not unlimited, 647, 652, 655,

                                                                                                                                                                                                                                                                                                           

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