478 Mr. F. E. Blaauw : Field-notes on some 



that there is a double spring moult, first into a transitional 

 and then into a distinct summer dress ? And what becomes 

 of the moulted feathers, since the most careful search does 

 not discover tbem to the owner of the bird ? 



I shall forward my dead bird to the Natural History 

 Museum at South Kensington, where it will be available 

 for examination and therefore of more use than in my own 

 cabinet. 



[The example of Pyromelana oryx referred to by Dr. Butler 

 is now in the British Museum, and does not in our opinion, 

 or that of others who have examined it, warrant the con- 

 clusion that the colour-change is broiight about by the 

 absorption of fresh-colour by the old feathers. Both it and 

 other examples, especially one collected by Mr. Swynnerton 

 in Rhodesia in November (reg. no. 1911. 5. 30.394-), show 

 undoubted signs of moult. — Ed.] 



XXIII. — Field-notes on some of the Waterfowl of the Argentine 

 Republic, Chile, and Tierra del Fuego. By F. E. Blaauw, 

 C.M.Z.S., M.B.O.U. 



(Plate XIV. & Text-figure 12.) 



In some previous papers I have given details of the breeding 

 and development of some of the Waterfowl of South America 

 from experiences gathered on birds kept by me at Gooilust. 

 In the spring of 1911, during a trip to South America *, one 

 of my objects was to see as much as I could of the Water- 

 fowl of that country. 



In the following notes I give the results of my observa- 

 tions concerning those Waterfowl in their native haunts. 

 My route was as follows : — 



From Buenos Ayres, across the Andes to Santiago, from 

 Santiago southward, crossing and recrossing the Andes 

 between the Lake Todos los Santos and the Nahuel Huapi 

 Lake, from there to Puerto Montt, back northwards to 

 Corral, by ship to Punta Arenas ; from Punta Arenas to 



* See 'Notesi from the Leyden Museum,' vol. xxxv. 1912, pp. 1-74. 



