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. Molothrtjs RUFOAXiLLARis,Cassin; 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. Molothrtjs bonariensis (Gm.); Scl. et 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 winter going 
in large flocks. 
28. Molothrtjs badius (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^ius 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 iiolosericeus (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 
