174 Mr. H. Durnford on the Birds of 



yellow, with a tinge of grey. Under wing-coverts pale canary- 

 yellow. 



The young in their first plumage somewhat resemble the 

 adult female, but have less yellow about them. 



26. MoLOTHRUs RUFOAXiLLARis,Cassinj Scl.etSalv. P. Z. S. 

 1868, p. 140. 



Though I have never had the good fortune to obtain this 

 bird, I have twice been able to identify it, in October and 

 again in May. It resembles M. bonariensis at a little dis- 

 tance ; but the red patch on the elbow, when it is near enough 

 to be seen, affords a ready means of distinguishing the two 

 species. 



27. MoLOTHRUs BONARIENSIS (Gm.) ; Scl. ct Salv. P. Z. S. 

 1868, p. 140. 



Mr. Hudson^s researches on the genus which includes this 

 bird are very exhaustive (P. Z. S. 1870, p. 671, 1874, p. 153) ; 

 and my limited experience agrees with his accounts. I strongly 

 recommend any one who takes any interest in the instincts of 

 birds to read Mr. Hudson's papers. M. bonariensis is a very 

 common and generally distributed species, in the Avinter going 

 in large flocks. 



28. MoLOTHRUs RADIUS (Vieill.) ; Scl. et Salv. P. Z. S. 1868, 

 p. 140. 



Resident but not so numerous as the last species, and gene- 

 rally seen in small flocks. 



29. Agel^us thilius (Mol.) ; Scl. et Salv. P. Z. S. 1869, 

 p. 159. 



Resident and common throughout the province, flocking 

 in large numbers in the autumn and winter. It frequents 

 open country, preferring that which is low and swampy. 

 Common at Baradero in April. 



30. Amblyramphus holosericeus (Scop.) ; Scl. et Salv. 

 P. Z. S. 1869, p. 161. 



Resident and common in reed-beds and marshes, but more 

 numerous in the summer than winter. It has a loud clear 



