Bulletin - United States National Museum - si-pddr - Smithsonian ...

BIRDS OF ARGENTINA, PARAGUAY, URUGUAY, AND CHILE 269
In addition in the United States National Museum there is a specimen
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 recorded
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 cinnamon
buff. Five specimens from General Roca, Rio Negro, include
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 December
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 immature
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.