BIRDS OF NORTH AND MIDDLE AMERICA. 189 



dd. Chest white medially, shadins; 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 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 liindneck usually somewhat duller (approaching grayish 

 brown in worn plinnage) ; 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 luiiform 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 mngs 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 undei- tail-coverts liglit 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).« 



« Eighteen specimens. 



