DONACOBIUS. 373 



Genus DONACOBIUS Swains. 



BonacoUus Swainson, Zool. Illustr. (2nd ser.) ii. pi. 72, 1830. Type 

 D. atricapillus (Linn.). 



Fig. 144. — To show the form o£ the bill and nostrils. 



In this genus the bill is long, decurved and somewhat hooked 

 at the tip, the depth at the posterior portion of the nostrils is 

 about equal to the widths and the nostrils are exposed and oval in 

 shape. The wing is rounded, the fourth, fifth, and sixth primaries 

 are longest and equal, the third about equal to the seventh, and 

 the second about equal in length to the secondaries. The tail is 

 long and graduated, the outer feather on each side being about 

 three-sevenths the lenoth of the middle ones. The tarsus is about 

 one-third longer than the exposed cuhnen, which is about equal 

 in length to the middle toe without the claw. Coloration : male 

 and female similar. 



577. Donacobius atricapillus. 

 Black-capped Mocking-Thrush. 



Tvrihis africapilla Linn. Nat. i. p. 295, 1766 (Brazil). 



Donacobiuft atricapillus Cab. in Scliomb. lieis. Guian. iii. p. 674, 1848 ; 

 Sharp.?, Cat. B. Brit. Mus. vi. p. 364, 1881; Salvin. Ibis, 188o, 

 p. 199 ; Beebe, Our Search for a Wilderness, p. 376, 1910 (Abarv 

 Savannas) ; Braboume & Chubb, B. S. Amer. i. p. 342, no. 3498, 

 1912. 



Adult malt>. Crown of head, sides of face, and hind-neck black ; 

 back, scapulars, upper wing-coverts, -and flight-quills coffee- 

 brown, rather darker on the last ; paler and more umber-brown 

 on the lower back, rump, and upper tail-coverts ; base of primary 

 and outer secondary quills wliite, which graduates and becomes 

 much less in extput on the outermost primary; tail blackish 

 tipped with while, tlw outermost feather on each side enliroly 



