] 14 Mr. C. IT. B. Grant on Birds colfected in Argentina, 



79. Machetornis rixosa. 



Machetornis rixosa Sel. Cat. B. xiv. p. 52 ; Arg. Orn. i. 

 p. 131. 



a. S ad. Los Ynglases, Ajo. Sept. 14, 1908. 



b. (? ad. ,, „ Nov. 5, 1908. 



c. ? ad. Luiconia, ,, Dec. 29, 1909. 



d,e. $(Jad.&yg. Los Yiiglases, Ajo. Feb. 27-Mar. 1, 

 1909. 

 f,g, h, i,j. S ad. &yg. „ „ Mar. 3-30, 1909. 



k, I. ? ad. „ „ Apr. 23, 1909. 



May 11, 1909. 

 Villa Frauca, Paraguay. Aug. 10, 1909. 

 Monte Alto, „ Aug. 25, 1909. 



Colonia Risso, „ Sept. 8, 1909. 



Near Goya, N. Argentine. Nov. 13, 1909. 

 The February, March, and April adults are moulting and 

 some have almost assumed the new dress. 



The November bird from Goya is much worn and is 

 moulting on the chest. 



Ad. Irides clear hazel ; bill, legs, and toes black. 

 A common and resident species in the Ajo district and 

 many individuals were also observed on the river expedition. 

 It is usually seen following the stock about and catching 

 the flies that surround the cattle, horses, and sheep, while it 

 will frequently percli on the backs o£ the animals. 



80. CeNTRITES NIGER. 



Centrites niger Scl. Cat. B. xiv. p. 61 ; Arg. Orn. i. p. 134. 



a. ($ ad. Los Ynglases, Ajo. Jan. 29, 1909. 



d, Cjflf,^, c?ad.&yg. „ „ Feb. 5-26, 1909. 



f,g, h. S ^ ad. & yg. „ „ Mar. 30, 1909. 



i. ^ young. „ „ April 15, 1909. 



j. S ad. „ „ Jan. 11, 1910. 



^ . Irides dark brown ; bill, legs, and toes black, j 



The January, February, and March adults are moulting, 

 the latter birds having almost completed the change. 



One of the February young males is in full adult plumage 

 except for the ashy e<lge to the feathers of the head and 

 under parts. 



