Insecta, definition, [86]

Instar, [155], [158]

Instinct of Leucospis, [541]

Integument, [162]

Internal anatomy, [186] f.;

of Acridiidae, [282] f.;

of earwigs, [210];

of Gryllotalpa, [335];

of Hymenoptera, [494];

of Libellula, [414];