The Red-eyed. Vireo 
relatively less common in San Diego County. The Coast Range is shot 
full of visiting Peps, at least as far north as Alameda County, where they 
have been known to breed. In the great interior valley they are only 
occasionally found in the lower portion, as at Fresno (Tyler), Tracy 
(Grinnell), and Marysville; but they abound throughout the Upper 
Sonoran and Lower Transition belt of the western Sierran foothills, and 
have been taken as far north as Chico. Throughout this extensive, irreg¬ 
ular area, nesting may be undertaken at any time from middle or early 
May up to late June; but it is probable that only one brood per pair 
is raised. 
The movements and distribution of this species are, thus, very 
complicated, and we shall never know the whole truth about it until a 
thorough-going system of trapping and banding (the placing of alumi¬ 
num bands bearing registered numbers upon the legs of fledglings) is 
carried out. 
No. 112 
Red-eyed Vireo 
A. 0. U. No. 624 . Vireosylva olivacea Linnteus. 
Description. — Adult: Crown grayish slate (deep mouse-gray), bordered on 
either side by blackish: a broad white line above the eye, and a dusky line through 
the eye; remaining upperparts light grayish olive-green (the olive-green element 
present as a gloss or overlay over dark gray,—in its pure aspect courge green or 
mignonette green); wings and tail dusky with narrow olive-green edgings; below dull 
white, with a slight greenish yellow tinge on lining of wings, sides, flanks, and crissum; 
first and fourth, and second and third primaries about equal, the latter pair forming 
the tip of wing. Bill blackish at base above, thence dusky or horn-color; pale below; 
feet leaden blue; iris red. Little difference with age, sex, or season, save that young 
and fall birds are brighter colored. Length 139.7-158.8 (5.50-6.25); wing 80 (3.15); 
tail 53.5 (2.11); bill 12.5 (.49); tarsus 18 (.70). 
Recognition Marks. —Warbler size; largest; white superciliary line contrasting 
with blackish and slate of crown; red eye. Note smoother, and utterance a little 
more rapid than in L. s. cassini. 
Nesting. —Does not breed in California. Nest: A semi-pensile basket or 
pouch of bark-strips, “hemp,” and vegetable fibers; lined with coarse coiled bark-strips 
or grasses, and fastened by the edges to forking twigs near end of horizontal branch; 
five to twenty feet up. Eggs: 3 or 4; white, flecked very sparingly, and chiefly near 
the larger end with dark brown (bone-brown to natal brown) or blackish. Av. size 
19.8 x 14.2 (.78 x .56). 
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