_Acraea_, taken by kestrel, 118; _A. axina_, 122; _A. caldarena_, 122; _A. egina_, 34, VI. 7; _A. encedon_, patterns of different forms in relation to those of _Danais chrysippus_, 29, 144; typical form of, IX. D; _alcippina_ form of, IX. E; _daira_ form of, IX. F; _A. halali_, 122; _A. violae_, 33 note; eaten by lizards, 108; attacked by birds, 110, 117 Acraeinae, as models for African butterflies, 33 Adaptation and Natural Selection, 61 _Adelpha_, 54 African butterflies, mimicry among, 28-36 _Alcidis agathyrsus_, 27, 145, III. 1 _Aletis helcita_, 36 _Amauris echeria_, 30, 148, VIII. 7; _A. hyalites_, 30, VI. 2; _A. niavius_, 30, VIII. 6 _Amphidasys betularia_, rapidity of increase in melanic sport of, 101 _Anosia plexippus_ (= _Danais archippus_), 113 _Anthomysa_, 41 _Aporia agathon_, 149 _Araschnia levana_, seasonal dimorphism in, 130; typical form, VI. 10; _prorsa_ form, VI. 9; _porima_ form, VI. 8 _Archonias_, 43, 56, 145; _A. critias_, XI. 10 _Argynnis diana_, 47, XVI. 3; _A. hyperbius_, 29; as mimic of _Danais plexippus_, 52; in mimicry ring, 66, IV. 3, 4 _Artamus fuscus_, 112 Asilid flies, as enemies of butterflies, 106 _Athyma punctata_, 53 Bates, G. L., on contents of birds' stomachs, 113 Bates, H. W., on mimicry, 9; on resemblances between unpalatable forms, 14; on initial variation in mimetic resemblance, 63; on S. American Pierines attacked by birds, 112 Bateson, 3 _Belenois_, 36 Bingham, on birds eating butterflies, 110 Birds, as enemies of butterflies, 109; stomach contents of, 113; feeding experiments with, 115; colour perception in, 119 Bowater, on _Amphidasys betularia_, 102, 137 note Breeding experiments, with _Hypolimnas dubius_, 30; with _Papilio polytes_, 84; with _Papilio memnon_, 89; with _Papilio dardanus_, 90; with _Pseudacraea eurytus_, 128 Bryant, on birds eating butterflies, 114 _Buchanga atra_, 111 _Byblia ilithyia_, 122 {184} _Caduga tytia_, 24, 51, II. 2 _Callamesia pieridoides_, 56 _Calotes ophiomachus_, 107; _C. versicolor_, 107 Carpenter, on intermediates in _Pseudacraea eurytus_, 126; on breeding experiments with _Pseudacraea eurytus_, 128 _Castnia_, as mimic, 39, XII. 4; scales of, 41, XV. 5 _Catopsilia_, 121; _C. florella_, 111; _C. pyranthe_, 111 _Cerchneis rupicoloides_, 118; _C. naumanni_, 117 _Cercopithecus pygerythrus_, 121 _Charaxes athamas_, 110 _Citronophila similis_, 35 Classification of butterflies, 18-21 _Colaenis telesiphe_, 38, XI. 4 _Cyclosia hestinioides_, III. 3 _Cymatophora or_, establishment of melanic sport in, 102 note _Cyrestis thyodamas_, 110