the Province of Buenos Ayres. 189 



87. Ardea cocoi, Linn. ; Scl. et Salv. P. Z. S. 1869, p. 634. 

 Resident and the commonest Heron here. Common at 



Baradero in April. 



88. Ardea egretta, Gm.; Scl. et Salv. Nomencl. p. 135. 

 Not so numerous as the next mentioned, and, like that bird, 



in dry seasons not seen for months together. Iris dark orange. 

 Legs dark lead-colour. 



89. Ardea candidissima, Gm. ; Scl. et Salv. /. s. c. 



Resident; but its absence or presence is very much de- 

 pendent on the amount of rain we have. Iris pale yellow ; 

 legs dark lead-colour. 



90. Ardetta involucris (Vieill.) ; Scl. et Salv. P. Z. S. 

 1869, p. 635 ; Hudson, P. Z. S. 1875, p. 623. 



Probably resident, though I have only observed it in the 

 spring. It frequents the thickest reed-beds, and is very shy. 

 When flushed it has a frightened hurried flight, and always 

 drops again before flying far. Iris pale orange, the centre 

 rather lighter; legs light pea-green; beak yellowish green. 

 The young are at first covered with quite black down. 



91. Nycticorax obscurus, Bp. ; Scl. et Salv, Nomencl. 

 p. 136. 



Resident, and more generally distributed than the last- 

 named species. Feeds chiefly on flsh. Iris dull crimson ; 

 upper mandible and tip of lower one black, remainder of lower 

 mandible yellowish green ; legs light pea-green, undersides 

 with a tinge of yellow. 



92. CicoNiA MAGUARi, Gm.; Scl. et Salv. Nomencl. p. 126. 

 Resident, and generally very common ; but during the dry 



season very few are seen. In December last I saw two birds 

 of the year at Punta Lara barely able to fly ; these may have 

 been bred there. Common at Baradero in April. 



93. Falcinellus igneus (Gm). 



Ibis falcinellus, Scl. et Salv. P. Z. S. 1868, p. 145. 



Resident, though more numerous in the winter than sum- 

 mer, very common, and generally distributed. Eminently 

 gregarious in its habits, and flying in a large body in a V- 

 shaped form. My statement that they feed on carrion should 



