BIRDS OF NORTH AND MIDDLE AMERICA. 



37 



HYLOCICHLA MUSTELINA (Gmelin). 

 WOOD THRTJSH. 



Adults in spring and summer. — Pileum tawn3-bro\vn or russet, 

 passing into cinnamon-brown on back and scapulars, this into light 

 olive or grayish olive on riimj), upper tail-coverts, and tail; wings 

 similar in color to back but slightly less cinnamomeous ; a distinct 

 orbital ring of white; lores w^hitish, suffused with dusky grayish in 

 front of eye ; auricular region dusky grayish brown, narrowly streaked 

 with wdiite; malar region white, more or less flecked with dusky; 

 under parts white, more or less strongly tinged with buff on chest; a 

 broad submalar streak of black or dusky along each side of throat; 

 chest, sides, and flanks marked with large roundish or broadly gut- 

 tate spots of brownish black; bill dusky horn color, the basal half 

 (more or less) of mandible much paler (pale flesh color in life) ; iris 

 dark brown; legs and feet pale yellowish brown (pale flesh color in 

 life). 



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

 I)lumage but coloration brighter, and chest, together with lower 

 throat and streaks of auricular region, etc., more deeply yellowish 

 buff. 



Young. — Essential^ like adults, but pileum, hindneck, and upper 

 ))ack indistinctly streaked with pale tawny or ochraceous, lesser and 

 middle wing-coverts with similar but more wedge-shaped streaks, 

 greater coverts more or less distinctly tipped with the same, and 

 spots on under parts less sharply defined, more sooty in color. 



Adult male.— Length (skins), 174-196 (181); wing, 104.5-113 

 (109); tail, 67-77.5 (71.5); exposed culmen, 16-19 (17.1); tarsus, 

 30-33 (31.6); middle toe, 17.5-20.5 (19). « 



Adult female.— Length, (skins), 159-188 (177); wing, 103-109.5 

 (105.6); tail, 63-71.5 (67.9); exposed culmen, 16-18 (17); tarsus, 

 28.5-32 (30.1); middle toe, 17-19.5 (18.4).^ 



a Fifteen specimens. 

 b Ten specimens. 



Specimens from the Mississippi Valley compare in average measurements with 

 those from the Atlantic coast district as follows: 



