AVES PTEROTOCHID^. 



745 



tials and some of the secondaries. Three females average browner than 

 the males, but there is no marked difference in either size or color be- 

 tween the sexes. 



Some individuals of each sex exhibit the silvery white dots or bars on 

 the crown which Chapman (Auk, 1915, p. 407] has shown are purely indi- 

 vidual and not dependent upon either sex or age. 



Fig. 383. Scytaiopus magellaniciis, cf 7710. About two-thirds natural size. 



Geographical Range. — Patagonia from Lake Nahuel Iluapi to Tierra 

 del Fuego and the Falkland Islands, in the Andean Forest Zone. 



This wren-like bird was taken and recorded by the naturalists of the 

 Princeton Expeditions at Punta Arenas, where it was very abundant and 

 in the Andes of southern Patagonia, near the headwaters of the Rio Chico 

 de Santa Cruz. 



The bird is common and occurs in the dense forests and in the wooded 

 regions where it skulks about and is oftener heard than seen ; it is one of the 

 characteristic birds of the Patagonian region, but as yet little is known as 

 to its breeding habits, general life history and even its two phases of 

 plumage referred to in the citations preceding may be found on further 

 study to constitute two allied species. 



