GLOSSAKY OF TECHNICAL TEEMS. 
115 
Unciform (L. uncifor'mis), ) ^ HooM> 
Un'cinate (L. uncina'tus), ) 
Un'der Parts (L. gastroz'um), n. The entire lower surface of a bird, from 
chin to crissum, inclusive. (Same as Lower Parts.) (See note facing 
plate XL) 
Un'der Pri'mary-cov'erts, n. The primary-coverts of the under surface 
of the wing. (Plate XIII. fig. 2.) 
Un'der Tail-cov'erts (L. tec' trices subcau' dales ; calypte'ria inferio'ra), n. 
The feathers immediately beneath the tail. (Practically synonymous 
with Crissum.) (Plate XL) 
Un'der Wing-cov'erts (L. tec'trices suba'lares), n. The coverts of the 
under surface of the wing. Taken collectively, the term Lining of the 
Wing, or Wing-lining, is generally used. (Plate XIII. fig. 1.) 
Un'dulate, 1 (L. undula'tus), a. Marked with wavy lines. (Plate XV. 
Un'dulated, ) fig. 14.) 
Unguic'ulate (L. unguicula'tus) , a. Clawed. 
Un'guis (L. ; pi. un'gues), n. A claw. 
Unip'arous, a. Producing but one egg, as the Petrels (Procellariidce) 
and Auks (Alcidoz). 
Up'per Parts (L. notoz'wn), n. The entire upper surface, from forehead 
to tail inclusive. (See note facing plate XL) 
Up'per Tail-cov'erts (L. tec'trices cau'doz super io' res ; calypte'ria superio'ra), 
n. The feathers overlying the base of the tail, — sometimes produced 
beyond its tip and simulating the true tail, as in the Peacock (Pavo 
cristatus) and Paradise Trogon (Pharomacrus moccino). 
Uropy'gial (L. uropygia'lis) , a. Pertaining to the rump. 
Uropy'gium (L.), n. The rump. (See plate XL) 
U-shaped, a. Having the form of the letter U. (Plate XV. fig. 4.) 
V. 
Vandyke' Brown, n. A rich deep brown, very similar to burnt umber 
but rather less reddish. (Plate III. fig. 5.) 
Vane, n. The whole of a feather excepting the stem. 
Vari'etal, a. Pertaining to or having the characteristics of a variety. 
Vari'ety (L. vari'etas), n. Properly, an individual or unusual and irregu- 
lar variation from the normal type of form or coloration, as the various 
breeds or "strains" of domesticated animals. But the term is often, 
though improperly, applied to subspecies, or geographical races. 
Vent (L. ven'ter), n. The anus. 
Vent'ral (L. ventra'lis), a. Pertaining to the vent. 
Vent'ral Re'gion (L. re'g'io ventra'lis; re'gio anal'is), n. The feathers 
surrounding or immediately adjacent to the vent. (Plate XL) 
