BIRDS OF ARGENTINA, PARAGUAY, URUGUAY, AND CHILE 269 



In addition in the United States National Museum there is a speci- 

 men taken by Capt. T. J. Page, labeled as secured in Uruguay in 

 July, 1860. 



SIPTORNIS SORDIDA FLAVOGULARIS (Gould) 



Synallaxis fiavogularis Gould, Zool. Voy. Beagle, pt. 3, Birds, November, 

 1839, p. 78, pi. 24. (Bahia Blanca and Santa Cruz.) 



The present spinetail, of wide distribution in Argentina, was re- 

 corded at the following points : General Roca, Rio Negro, November 

 24 to December 3, 1920; Zapala, Neuquen, December 9; Ingeniero 

 White (Bahia Blanca), Buenos Aires, December 13; Guamini, 

 Buenos Aires, March 8, 1921; Potrerillos, Mendoza, March 17 and 

 19; Tunuyan, Mendoza, March 23 to 27; and at Formosa, Formosa, 

 August 24, 1920. 



The series from Ingeniero White, the port of Bahia Blanca, in- 

 cludes two males and seven females, taken December 13, all breeding 

 birds, in worn, abraded plumage. These may be considered topo- 

 typical skins, as Darwin states that he collected his specimens at 

 Bahia Blanca and Santa Cruz. The series of females shows con- 

 siderable variation in the form of the throat patch. In one the 

 throat spot is fairly large (though smaller than in males) and tawny 

 in color; in three the patch, while similar in hue, is restricted and 

 more or less obscured by a mixture of white ; in another the area in 

 question is faintly washed with yellowish; and in two the throat is 

 plain white. In one male the throat is tawny and in the other cin- 

 namon buff. Five specimens from General Roca, Rio Negro, in- 

 clude four adult males shot November 24 (two), 27, and December 

 3, and two adult females killed November 25 and December 9. 

 These do not differ appreciably in color from those from Bahia 

 Blanca when allowance is made for the fact that they are in better 

 feather. All have the colored throat patch with the usual range in 

 depth of color, and show more distinct blackish points on the tips 

 of the feathers than in case of the more worn specimens from the 

 coast. One adult female has a patch of white feathers in the center 

 of the nape. An adult female taken at Zapala, Neuquen, on De- 

 cember 9 is badly Avorn and is renewing the central rectrices- The 

 single specimen from Guamini, in western Buenos Aires, similar 

 in general appearance to those described above, is an immature 

 female in molt into adult plumage. 



At Potrerillos, Mendoza, an immature female and another im- 

 mature bird whose sex was not known were taken at an altitude 

 of over 1,500 meters on March 17; and at Tunuyan, Mendoza, two 

 immature males and an adult female were taken March 23 and two 

 immature females on March 27. The adult female, in full molt. 



