64 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



HYLOCICHLA FUSCESCENS FUSCESCENS (Stephens). 

 WILSON'S THRUSH. 



Adults in spring and summer. — Above plain tawny-brown (varying 

 from almost cinnamon-brown to a more isabelline hue), the wings 

 and tail slightly duller brown, especially the former; loral region 

 dull grayish white, the former sometimes slightly suffused with gray- 

 ish in front of eye; eyelids similar, the color not forming a distinct 

 orbital ring; auricular region rather light dull tawny-brown, narrowly 

 streaked with dull brownish white; malar region dull buffy white, 

 becoming decidedly buffy posteriorly, where more or less distinctly 

 streaked with tawny-brown; chin and throat buffy wliite, gradually 

 passing into pale buff or pinkish buff on chest, the latter tinged with 

 brown laterally, the upper chest and sides of lower throat streaked 

 with tawny-brown, the lower chest spotted with a paler and slightly 

 grayer tint of the same ; "• sides and flanks light buffy grayish or pale 

 hair brown, the sides of breast sometimes faintly spotted with a 

 darker shade of the same; rest of under parts white; axillars pale 

 brownish gray, tipped with white; under wing-coverts mixed pale 

 brownish gray and white, usually slightly tinged with pale brownish 

 buff; bill dark horn color (the maxilla sometimes blackish horn color), 

 the basal half (more or less) of mandible pale yellowish (pale grayish 

 flesh color or lilaceous in life?); iris dark brown; legs and feet pale 

 brownish or pale yellowish brown (dull flesh color in life?). 



Adults in autumn and winter. — Similar to the spring and summer 

 plumage and not constantly different, but averaging slightly brighter 

 (more cinnamomeous or tawny) above, and chest and sides of lower 

 throat slightly deeper buff. 



Young. — Above dull cinnamon or tawny-brown, each feather of 

 pileum, hindneck, back, scapulars, and lesser and middle wing- 

 coverts with a mesial streak or spot*^ of yellowish buff or light clay 

 color, the rump and upper tail-coverts with larger but less distinct 

 spots of a deeper or more tawny hue; greater wing-coverts usually 

 with a more or less distinct terminal spot or margin of brownish buff 

 or clay color; under parts white, the chest, sides of lower throat, and 

 sides of breast more or less strongly suffused or tinged with brownish 

 buff or pale tawny, and barred or transversely spotted with dark 

 sooty brown or dusky, most heavily on chest ; a more or less distinct 

 submalar streak of dusky along each side of throat. 



o The streaks are more linear on sides of lower throat, more cuneate on upper chest, 

 the spots on lower chest more or less triangular and transverse (broader than long); 

 in color the streaks are nearly like the color of the back, but sometimes decidedly 

 darker. 



b The markings are smaller and usually narrower on pileum, larger and more spot- 

 like on back. 



