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

416 BULLETIN 133, UNITED STATES NATIONAL MUSEUM
able southward extension in its known range, and I have seen a male
taken by D. S. Bullock, July 29, 1922, at Jujuy. Through W. E.
Clyde Todd, of the Cartiegie Museum, I have been permitted to
examine the type of B. c. hypoleuca, two additional specimens from
the type locality, and two others from Guanacos, Province of Cor-
dillera, Bolivia. The present form differs from B. c. argentina
in more rufescent dorsal surface, with the dark longitudinal stripes
extended forward practically to the brown neck collar. Below
hypoleuca is whiter with little or no gray on the breast, and with
the lateral underparts brighter, more buffy in color.
At Tapia, Tucuman, from April 6 to 13, 1921, these birds were
common in weed-grown areas scattered through the dry, scrubby
forest, or in weed patches that bordered fields and low thickets.
It is possible that the number of residents in this region had been
augmented by the arrival of migrants from the higher levels of the
mountains a few kilometers westward, as it was usual to find them
in flocks that contained nearly 100 individuals. Though a part
were in fresh fall plumage, others were in ragged molt. Their
flocks often were found in company with Coryphospingus and
SaltatHcula. In sjDite of their disreputable feathers, males sang
regularly, and I saw one, more exuberant than others, rise to give
a flight song. One male and three females collected on April 6,
8, and 9 offer the following measurements:
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