104 Mr. C. H. B. Grant on Birds collected in Argentina , 
This is the commonest of the three Cow-birds found in 
the Ajo district, and during the winter months congregates 
in flocks in company with A. holosericeus, and does con¬ 
siderable damage to the maize. It was also observed in 
several localities in the Argentine and Paraguay during the 
river expedition. 
Its parasitical habits have been well described by Hudson 
and need no further additions. 
56. Molothrus rufoaxillaris. 
Molothrus rufoaxillaris Scl. Cat. B. xi. p. 338; Arg. Orn. 
i. p. 86. pi. vi. fig. 2. 
a. A a( k Bos Ynglases; Ajo. Sept. 12, 1908. 
Iris hazel; bill, legs, and toes black. 
b. $ ad. Los Ynglases, Ajo. Nov. 17, 1908. 
c. $ juv. „ „ March 23, 1909. 
d. e. S ? a( k )> >> April 28, 1909. 
/. $ ad. „ „ Jan. 7, 1910. 
This is the least common of the three Cow-birds found at 
Ajo, and consorts with the flocks of M. bonariensis. 
It can be distinguished from the male of that species by 
its duller appearance and different cry. Eggs presumably 
of this species were taken in the nests of Pseudoleistes 
virescens and M. badius. 
57. Molothrus badius. 
Molothrus badius Scl. Cat. B. xi. p. 338; Arg. Orn. i. 
p 95. 
a. $ ad. Los Ynglases, Ajo. Oct. 29, 1908. 
b. A juv. „ „ Nov. 17, 1908. 
c. S j^v. „ „ Dec. 9, 1908. 
d. e. $ ? juv. Luiconia, Ajo. Dec. 29, 1908. 
/. $ juv. Los Ynglases, Ajo. Jan. 25, 1909. 
g . ? ad. ,, „ March 10, 1909. 
h , i, k, l. A a d. et imm. Los Ynglases, Ajo. May, 1909. 
m. $ ad. Riacho Ancho, N. Argentine. Aug. 1, 1909. 
n. ad.; o. A imm. VillaMortero,Paraguay. Aug. 13, 
1909. 
p. $ ad. Goya, N. Argentine. Nov. 13, 1909. 
