Tylas, [504], [505];

T. eduardi, [533];

mimicry, [533]

Tympanic cavity, [11]

Tympaniform membrane, [13], [21]

Tympanistria, [327];

T. bicolor, [339]

Tympanuchus, air-sacs, [201];

T. americanus, [235];

T. cupido, [235];