146 Mr. J. Graham Kerr on the Avifauna 



139. Chauna chavaria, {Op. cit. ii. p, 119.) 

 Toba, '' Ptaka.'^ 



Common. On the Pilcomayo the Chaja was seen always in 

 isolated pairs, never in flocks. When feeding, if their sus- 

 picions are aroused in any way they at once fly ofi", uttering 

 loud cries, and alight on the summit of a dead palm-stem or 

 other elevation from which they have an unobstructed view 

 all round. At night they sleep in similar situations, and are 

 extremely vigilant, at once raising the alarm if any large 

 animal is moving about in the vicinity. 



140. Dendrocygna fulva. [Op. cit. ii. p. 126.) 

 Obtained near Fortin Donovan about the middle of 



summer, after the occurrence of heavy rains had caused the 

 formation of several temporary freshwater lagoons. 



141. Dendrocygna viDUATA. (Op. cit. ii. p. 128.) 

 Obtained along with D. fulva. 



142. Cairina moschata. {Op. cit. ii. p. 129.) 

 Toba, '' Waturunyi.'' 



This is the only Duck which I found at all common upon 

 the Pilcomayo itself, it apparently having less objection to 

 salt water than most of its relatives. At night and during 

 the heat of the day they roost in trees near the river. They 

 go to their roost late, and do not leave it till shortly after 

 dawn. They are usually met with in small parties or solitary, 

 but occasionally in flocks of about twenty. 



I 143. QUERQUEDULA CYANOPTERA, [Op. cit. ii. p. 130.) 



Near Fortin Donovan. 



144. QUERQUEDULA VERSICOLOR. [Op. cit. U. p. 131.) 



Near Fortin Donovan. 



145. QuERQUEDULA BRASILIENSIS. {Op. cit. U. p. 133.) 



(No. 360, ? .) Fortin Donovan. January 12th, 1891. 



146. Dafila spinicauda. {Op. cit, ii. p. 134.) 

 Near Fortin Donovan. 



147. Spatula platalea. (Op. cit. ii. p. 136.) 



This and all the above-mentioned Ducks, with the exception 



