N.W. Argentina and the Bolivian Chaco. 447 



is in such a bad state that it is difficult to ascertain the 

 colour of some parts of the plumage, but the back is 

 not stained and its colour is more sandy than in typical 

 T. orbignianus, with hardly any rufous tinge. The forehead 

 and nape are not grey but sand-coloured with black central 

 spots, thus resembling the back in colour. The sides of the 

 face are light sandy. The colour of the fore-neck cannot be 

 made out, and in other respects the plumage is similar to that 

 of the known species. It is thus difficult to form an opinion 

 about the specimen. It might be a young bird, although it 

 does not appear to be so. 



-j-9. Plegadis guarauna (Linn.). 



Iu large flocks on the moist meadows. 



10. Nycticorax tayazuguira (Vieillot). 



A young bird, the only specimen obtained, was shot in 

 November 1901 at San Antonio, Puna de Jujuy. 



11. Nettion elavirostre (Vieillot). 



This little Duck was rather common in the rivulets on the 



12. Spatula platalea (Vieillot). 



A young female was shot in a rivulet at Moreno on 

 December 10th, 1901, but the species was rather scarce. 

 Other specimens were shot at Abra Pampa, not far from 

 Moreno. 



13. Ibycter megalopterus (Meyer). 



Very common at Moreno. It feeds on carrion, though 

 also on living prey, and in addition to this on insects 

 (beetles) and seeds. 



14. BUTEO ERYTIIRONOTUS (King). 



A beautiful female specimen of this Buzzard was obtained 

 at Moreno. 



-j-15. Falco fusco-c.erulescens Vieillot. 



Two specimens, shot at Moreno in November 1901. This 

 Falcon preys on small birds and mice. 



