observed in the Gran Chaco. 233 



98. Plegadis guarauna (Linn.). 

 Near W., Oct. 29. 



99. AjAJA ROSEA Reichenb. 



Villa Concepcion, Oct. 9. Flock ; also singly. 



Fara. XXIX. Palamedeid^. 



100. Chauna cristata (Sw.). 



Chauna chavaria, Arg. Ornith. ii. p. 119. 

 Villa Concepcion, a pair, Oct. 10. 

 W., Nov. 4. Occasional pairs seen. 



Fam. XXX. A n a t i d ,e. 



101. Cairina moschata (Linn.). 



Villa Concepcion ; Caraya Vuelta, Oct. 21 ; Riacho Verde, 

 Oct. 27. Near W., Oct. 29. W., many in swamp, Oct. 30; 

 Dec. 1, many. 



Villa Concepcion, Oct. Abundant, singly and in pairs. 



W. Very common, the most abundant Duck except 

 Dendrocycna viduata. 



102. Sarcidiornis carunculata (Illig.). 

 W., Oct. 31, Nov. 2, Dec. 10. 



Frequently seen about the margins of the swamp, singly 

 and in pairs. Extremely shy and difficult to approach. 



103. Dendrocycna viduata (Linn.). 



Villa Concepcion. Oct. 27, Riacho Verde. Near W., 

 Oct. 29. 



W. Abundant, This species was the most common 

 Duck in the neighbourhood of Waikthlatingmayalwa. It 

 breeds in hollow palm-trees, the nest being of decayed wood, 

 lined with down. 



104. Dendrocycna fulva (Gm.). 



Villa Concepcion, large flock, Sept. 30 ; flock, Oct. 10. 

 W., Nov. 27. Frequent. 



105. Querquedula brasiliensis (Gm.). 



Villa Concepcion ; near W., Oct. 29, Nov. 2, Jan. 14. 



