1 14 Mr. C. H. B. Grant on Birds coltected in Argentina , 
52 ; Arg. Orn. i. 
79. Machetornis rixosa. 
Machetornis rixosa Scl. Cat. B. xiv. p 
p. 131. 
a . B ad. Los Ynglases, Ajo. Sept. 14/1908. 
b. S ad. ,, „ Nov. 5, 1908. 
c. $ ad. Luiconia, „ Dec. 29, 1909. 
d. e. ? Bad. & yg. Los Ynglases, Ajo. Feb. 27-Mar. 
1909. 
f>9>Khj- & ad.&yg. „ „ 
h, l. $ ad. ,, ,, 
1 , 
m. £ ad. 
n. B ad. 
o. B ad. 
p. ? ad. 
q. B ad. 
Mar. 3-30, 1909. 
Apr. 23, 1909. 
May 11, 1909. 
Aug. 10, 1909. 
Aug. 25, 1909. 
Sept. 8, 1909. 
Nov. 13, 1909. 
Villa Franca/Paraguay. 
Monte Alto, ,, 
Colonia Risso, „ 
Near Goya, N. Argentine. 
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 perch on the backs of the animals. 
80. CENTRITES NIGER. 
Centrites niger Scl. Cat. B. xiv. p. 61 ; Arg. Orn. i. p. 134. 
Jan. 29, 1909. 
Feb. 5-26, 1909. 
Mar. 30, 1909. 
April 15, 1909. 
Jan. 11, 1910. 
a. B ad. Los Ynglases, Ajo. 
b, c,d,e, ad.&yg. „ „ 
f, 9, b. $ ? ad. & yg. „ „ 
i. young. „ „ 
j. $ ad. )t jj 
B . 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 edge to the feathers of the head and 
under parts. 
