BIRDS OF NORTH AND MIDDLE AMERICA. 189 
dd. Chest white medially, shading into pale gray laterally; brown of back, 
etc., lighter, more buffy. (Eastern Panama.) 
Synallaxis albescens hypoleuca (p. 195). 
aa. Pileum without any rufous (uniform dark brown); chest not rufous. ( Young.) 
b. Chest brown. .....-.-.-.. 2.222222 0e- Synallaxis erythrothorax, young (p. 189). 
bb. Chest dull slate-grayish or olive-slaty. 
Synallaxis pudica nigrifumosa, young (p. 192). 
SYNALLAXIS ERYTHROTHORAX Sclater. 
RUFOUS-BREASTED SYNALLAXIS. 
Adults (sexes alike)—Above plain sepia or bister brown, the 
pileum and hindneck usually somewhat duller (approaching grayish 
brown in worn plumage); tail more chestnut brown, the shafts of 
rectrices black; wings chestnut, passing into brown on terminal por- 
tion of remiges and on tertials; sides of head and neck similar in 
color to pileum and hindneck; chin and upper throat blackish slate 
or slate-black, streaked (more or less broadly) with white, the lower 
throat uniform blackish slate or slate-black, or with feathers tipped 
with slate color; chest, upper breast, sides of breast, and under 
wing-coverts uniform chestnut-rufous or deep cinnamon-rufous, 
passing into light brown (nearly raw-umber) on flanks; abdomen 
and median portion of lower breast transversely mottled or barred 
with whitish and mouse gray, more or less suffused with olive; under 
tail-coverts similar in color to flanks but rather paler and grayer; 
bill black, the mandible sometimes brownish or horn colored basally; 
legs and feet dusky horn color (in dried skins). 
Young.—Upper parts as in adults, but chestnut of wings broken 
by brown tips to middle and greater wing-coverts; chin and upper 
throat transversely mottled or barred with grayish white and dull 
slate color, the lower throat nearly uniform dull slate color; chest, 
upper breast, sides, flanks, and under tail-coverts light brown (between 
isabella color and raw umber), the abdomen and median portion of 
lower breast pale grayish transversely mottled or barred with brown; 
basal half or more of mandible light colored. 
Adult male—Length (skins), 132-157 (146); wing, 53.5-61.5 (57); 
tail, 58-70.5 (65.7); culmen, 12.5-14.5 (13.8); tarsus, 19-21 (20.4); 
middle toe, 13.5-16 (14.9) .% 
a Kighteen specimens, 
