Birds of Lomas de Zainora. 471 



in shape, with a very slight hollow in the middle, where the 

 eggs, generally four in number, are laid. 



— 69. BuTORiDEs CYANURUS (Vieill.). 



Rather uncommon. I have only seen it two or three 

 times altogether, and have never known it nest here. 

 Frequents the reed- covered lagunas. 



—70. Nycticorax obscurus, Bp. 



[An immature specimen, probably referable to this species, 

 — P.L. S.] 



- 71. Plegadis guarauna (Linn.). 



[An immature specimen, apparently of this species, — 

 P. L. S.] 



72. Cygnus coscoroba, Mol. 



Fairly abundant ; usually seen in small flocks of six or 

 eight, about lagunas and other large sheets of water. 



-i-73. Mareca chiloensis (King). 

 Common during winter. It is migratory. 



-f-74. Rallus maculatus, Bodd. 



Very common in all the lagunas and arroyos where there is 

 cover. It breeds amongst the reeds, and its nest is placed 

 about eighteen inches from the water. To reach it the birds 

 collect a heap of reeds, grass, and other materials, and along- 

 side form an inclined platform that answers the purpose of a 

 staircase, by which the birds ascend or descend with ease. 

 The usual clutch of eggs is seven, but I have taken fifteen 

 from one nest, all good. These, of course, could not have 

 been laid by one bird. 



-+75. Rallus antarcticus. King. 



This is the only example of this bird I have seen. It was 

 killed by my dogs in a swamp, in June 1884. 



-f- 7Q. Rallus rhytirhynchus, Vieill. 



[A single skin of this Rail, obtained in November 1886. 

 — P.L.S.] 



—77. FuLicA ARMiLLATA, Vieill. 



-y-78. FuLicA LEUcoPYGiA (Hartl,). 



