106 ORNITHOLOGISTS' COMPENDIUM. 
Rudimentary, a. Imperfectly developed, as if only begun. 
Rufes'cent (L. rufes'cens), a. Inclining to a rufous color. 
Ruff, n. A collar of elongated or otherwise modified feathers round or on 
the neck. 
Ru'fous (L. ru'fus), n. A brownish red color, like the pigments called 
Venetian Red, Light Red, Indian Red, Red Chalk, etc., which rep- 
resent various shades of rufous. The typical shade is light red. 
(Plate IV. fig. 7.) 
Ru'ga (L.), n. A ridge or wrinkle. 
Ru'gose (L. rugo'sus), a. Wrinkled. 
Rump (L. uropy'gium), n. That portion of the upper surface of the body 
lying between the interscapulars and upper tail-coverts. (Plate XL) 
Rupi'coline (L. rupi'colus), n. Rock-inhabiting. 
Rus'set (L. russa'tus), n. A bright tawny-brown color, with a tinge of 
rusty. (Burnt sienna -f- cadmium orange -j- raw umber.) (Plate 
III. fig. 16.) 
s. 
Saffron Yel'low (L. cro'ceus), n. A peculiar shade of yellow, like that 
produced from the infusion of flowers of the saffron [Crocus sativus). 
(Plate VI. fig. 4.) 
Sage Green, n. A dull grayish-green color, like leaves of the garden 
sage. (Green oxide of chromium -j- black + white.) (Plate X. 
fig. 15.) 
Sag'ittate (L. sagiita'tus), a. Shaped like an arrow-head. (Plate XV. 
fig. 1.) 
Sali'va (L.), n. Spittle. 
Salivary Glands, n. The organs which secrete the saliva, or spittle. 
Sal'mon-Buff (L. sal mona'ceo-lu' tens), n. (Light red -f cadmium orange 
+ white.) (Plate IV. fig. 19.) 
Sarmon-Coror (L. salmona'ceus), n. A color intermediate between flesh- 
color and orange, like the flesh of the salmon. (Saturn red or orange- 
chrome + white.) (Plate VII. fig. 17.) 
Sal'tatory, a. Progressing by leaps ; hopping. (Opposite to ambulatory, 
or gradient.) 
Sanguina'ceous (L. sanguina'ceus ; sanguineus), n. or a. Blood-red 
(Same as crimson). (Plate VII. fig. 3.) 
Sat'urn Red (L. minia'tus), n. A very fine orange-red color; the same 
as red lead. (Red lead or saturn red.) (Plate VII. fig. 16.) 
Saurop'sida (L.), n. A primary group of vertebrate animals comprising 
birds and reptiles. 
Sauru'rae (L.), n. The name of an extinct primary group or order of 
birds, including the fossil Archceopteryx. 
