Paraguay, Boliviai, and Southern Brazil. 



?B^ 



This exceedingly graceful and pretty species is by no 

 means common in the montes in the Ajo district, but is 

 resident, being observed throughout the twelve months. 



It is seen singly, in pairs, cr occasionally three or four 

 together, creeping about among the upper branches of the 

 Tala trees after the manner of our Long-tailed Titmouse 

 {Acred/da caudata), and its note is very similar to that of the 

 Blue Titmouse {Parus cceruleus). Its flight as it goes from 

 tree to tree is dipping and graceful. 



There is little doubt that it breeds in this district, though 

 I did not find the nest or even see the birds carrying building 

 material ; but towards the close of the summer of 1908-1909 

 I saw one or two parties of old and young. 



6. DONACOBIUS ATRICAPILLUS. 



Bonacobius atricapillus Sharpe, Cat. B. vi. p. 364 ; Arg. 

 Orn. i. p. 13. 



a. S? ad. Boca de Homiguera, Brazil, Oct. 9, 1909. 



Irides rich yellow ; bill black, ashy on under side of lower 

 mandible ; bare skin on side of neck lemon-chrome ; legs 

 and toes dark ashy. 



Many individuals were observed frequenting the long grass 

 at the edges of the swamps. 



7. Troglodytes hornensis. 



Troglodytes hornensis Sharpe, Cat. B. vi. p. 257. 



Troglodytes musculus hornensis Oberhols. Proc. U.S. Nat. 

 Mus. xxvii. p. 203. 



a. ^ ad. Los Ynglases, Ajo. Sept. 16, 1908. 



/;, c,d. S ^ ad. „ „ Oct. 18-26, 1908. 



e,/. c? ? ad. & yg. „ „ Jan. 21-25, 1909. 



g. S ad. ' „ „ Feb. 3, 1909. 



h. ? ad. „ „ Mar. 10, 1909. 



i. ? young. „ „ Jan. 7, 1910. 



j. ? young. „ „ Feb. 2, 1910. 



Ad. Irides hazel; bill dark brown, lower mandible livid 

 flesh-coloured ; gape yellow ; legs and toes pale brown. 



The adult specimens vary slightly individually, but there 



