64 
ORNITHOLOGISTS' COMPENDIUM. 
Apple Green, n. A very light yellowish green color. (Light green 
zinnober -f- lemon yellow -f- white.) (Plate X. fig. 20.) 
Aquat'ic (L. aqua'ticus), a. Pertaining to the water. Aquatic birds are 
those which derive their subsistence chiefly from seas, lakes, or 
rivers, and include two artificial groups known as " Waders " and 
" Swimmers." 
Aq'uiline (L. aquili'nus), a. Eagle-like. 
Arbo'real, I (L arbo > reus \ a> Tree-inhabiting. 
Arbor icole, ) x 
Arcu'ate (L. arcuatus), a. Bow-shaped; arched. 
Are'olae (L. pi. of areola), n. The small naked spaces between the scales 
of the feet, usually called interspaces. 
Arie'tiform (L. arietiforinis), a. Having the form of the zodiacal sign 
Aries, T. (PlateXV.fig.il.) 
Armiria (L.), n. A colored ring round the lower end of the tibia; an 
anklet. 
Articulation, n. A joint or hinge. (Usually applied to the limbs.) 
Ash-color (L. cine'reus), n. (See Cinereous.) (Plate II. fig. 16.) 
As'ter Purple, n. A rich clear purple color, like some varieties of the 
aster. (Winsor & Newton's intense blue, or Schoenf eld's violet madder 
lake + Bourgeois's "rose tyrien.") (Plate VIII. fig. 8.) 
Asymmetrical, a. Without symmetry, or without close resemblance 
between corresponding parts, as opposite sides. (The pattern of 
coloration in partial albinos is often asymmetrical.) 
Asym'metry, n. Disproportion, or want of close resemblance, between 
corresponding parts or organs. (Very decided asymmetry of opposite 
sides of the skull is observable in some OwlsJ 
At'rophy, n. The wasting away, or obliteration, of an organ or part 
through deficient nutrition. 
Atten'uate (L. attenua'tus), a. Tapering or growing gradually narrower 
toward the extremity, but not necessarily pointed (which would be 
acuminate) . 
Auric'ular (L. auricula Wis), a. Pertaining to the ear. 
Auric'ula Purple, n. A deep but rather dull purple, like the color of 
the purple auricula. (Schoenfeld's violet madder lake, or Winsor 
& Newton's violet carmine.) (Plate VIII. fig. 3.) 
Auric'ulars (L. re'gio auricula' ris), n. The (usually) well-defined feathered 
area which conceals the ears in birds. (Plate XI.) 
Autoptical, a. Personally inspected. 
Autum'nal Plu'mage (L. ves'tis autumnal) s), n. The full dress of 
autumn. In most birds it remains essentially unchanged till the spring 
moult. In many species the young possess a peculiar autumnal plu- 
mage (assumed by their first moult) which differs not only from their 
first livery but also from that of adults at the same season. In such, 
the adult or mature plumage may be completely assumed at the next 
moult, or it may be gradually acquired by successive moults, as in the 
