of the Lower Pilcomayo. 127 



in large numbers in the tops of tlie Carandai palms. It 

 feeds chiefly in the open ; but its real home is in the re- 

 cesses of the tliick and dense " monte duro/^ where its deep 

 rich notes strike upon the ear ; and its elongated flask- 

 shaped nest may be seen suspended from the trees. The 

 nest is much smaller and more delicate than that of Ambly- 

 cercus solitarms ; and the root-fibres of which it is composed 

 are much less coarse^ and are black in colour, resembling 

 horsehair. 



[This Cassique was originally discovered by Azara in 

 Paraguay, and also occurs in the Sonth-Brazilian province 

 of E/io Grande. It mvist now be added to the Argentine 

 avifauna. — P. L. S.] 



34. MOLOTHRUS BONARIENSIS. {Op. cU. i. p. 72.) 



(Nos. 103 & 104, ? .) Fortin Donovan. May 18th, 1890. 

 Occasional flocks during winter. 



35. MoLOTHRUS RUrOAXILLARIS. [Op. c'lt. \. p. 86.) 

 (Nos. 136 & 137, ? .) Fortin Page. July 12th, 1890. 

 Very common. 



36. MoLOTHRUS RADIUS. {Op. clt. i. p. 95.) 

 (No. 2, ? .) Opposite Goya. 



Very abundant all along the banks of the Pilcomayo. 



37. Agel^us ruficapillus. {Op. cit. i. p. 99.) 



(Nos. 99 & 101, cJ .) Near Fortin Donovan. May 13th, 

 1890. 



Occasionally met with in flocks feeding amongst the tali 

 grass, &c., by the edges of marshes. 



38. AGELiEus CYANOPUS (Vicill.) : Scl. Cat, Birds, xi. p. 344. 

 (No. 176, c?; 160, ? .) Fortin Page. August 1890. 

 Seen occasionally in pairs during August and September, 



feeding amongst bushes near freshwater marshes. 



[Mr. Kerr brought home examples of both sexes of this 

 curious species, of which the male is of a uniform black. It 

 was originally discovered by Azara in Paraguay, and Nat- 

 terer got specimens on the Upper Paranji. It must now be 

 added to the Argentine avifauna. — P. L. S.] 



