UN´CIFORM, _a._ Hooked.
UNDER JAW. See MANDIBULUM.
UNDER PARTS. See GASTRÆUM.
UNDER TAIL-COVERTS. (13.) See CRISSUM.
UNDER WING-COVERTS. (84.) See TECTRICES.
UNDULA´TION, _n._ Wavy color-marks.
UNGUIC´ULATE, _a._ Clawed.
UNGUIS, _n._; pl. _ungues_. Claw.
UNIP´AROUS, _a._ Producing but one young. Same as _monotokous_.
UPPER BACK. (58.) See INTERSCAPILIUM.
UPPER JAW. (10.) See MAXILLA.
UPPER PARTS. (5.) See NOTÆUM.
UPPER TAIL-COVERTS. (72.) See CALYPTERIA.
UPPER WING-COVERTS. (84.) See TECTRICES.