142 Mr. J. Graham Kerr on the Avifauna 



•fill. Falco albigularis (Daud.) : Sharpe, Cat. B. i. p. 401. 

 ' (No. 155, ? .) Fortin Page, July 25tli, 1890. 

 Rather frequent during summer, and occasional during 

 winter. A bird of exceedingly powerful flight. 



[Obtained by Natterer in Matto Grosso {cf. Pelz. Orn. 

 Bras. p. 5, Hypotriorchis rufigularis) , but not yet recorded 

 from Argentina. — P. L. S.] 



-f 112. BOSTRHAMUS SOCIABILIS. {Op. Ctt. U. p. 72.) 



(No. 162, ? juv.) 



Frequent. Feeds chiefly on crabs. 



-113. Herpetotheres cachinnans (Linn.) : Sharpe, Cat. 

 B. i. p. 278. 



(No. 211, (^.) Near Fortin Page. December 5th, 1890. 



Bare. As one approaches this bird sitting on a high 

 branch, it bobs its head up and down, peering at one, and 

 utters a curious cry like a gruft' " ha-ha.'' The stomach of 

 a specimen examined contained the remains of a snake. 



[New to the Argentine list, but already recorded from 

 Paraguay by Azara. — P. L. S.] 



114. Harpyhaliaetus coronatus. [Op. cit. ii. p. QQ.) 



(No. 132, ? .) Fortin Page. July 12th, 1890. 



Rare. Sometimes seen perched on the topmost branch of 



a tall dead quebracho-tree. Utters a very loud and shrill 



cry. 



,115. Urubitinga zoNURA(Shavv) : Sharpe, Cat. B. i. p. 213. 



(No. 82, ? .) Near Fortin Donovan. April 30th, 1890. 



Very common. Often seen soaring about the camp-fires. 

 Occasionally feeds on fishes left stranded by the evaporating 

 pools. 



[Already known from Paraguay {Azara), and quite to be 

 expected to occur on the Pilcomayo. — P. L. S.] 



j; 116. BUSARELLUS NIGRICOLLIS. 



(No. 62, J .) Near Fortin Donovan. April 19th, 1890. 



Frequent. Usually found perched on the branch of a tree 

 overhanging the river, or by the borders of a marsh. At in- 

 tervals it utters a curious sheep-like cry, like the syllable 



