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

)
BIRDS OF ARGENTINA, PARAGUAY, URUGUAY, AND CHILE 267
At Victorica, Pampa, at the end of December young were out of
the nest, and though fully grown were still fed by their parents.
Young birds, fully grown, were secured in Uruguay late in January,
and one was taken at Tapia in April, In the Chaco this species was
known as Alomo ca-a guepe.
SIPTORNIS D'ORBIGNYII CRASSIROSTRIS (Landbeck)
SynQ,llaxis crassirostris Landbeck, in Leybold, Anales Univ. Chile, vol. 26,
no. 6, June, 1865, p. 713. (Between Melocoton and the Rio Tunuyan,
Mendoza.
A female Siptomis secured on the arid flats above the city of
Mendoza, on March 13, 1921, seems to agree with Hellmayr's ob-
servations regarding this form,^^ The specimen in question has
renewed the tail feathers and the wing feathers, save for the primary
coverts, while feathers of the head are still in molt. The bird
has a distinct rufous throat patch, the outer rectrix is wholly cinnamon,
the second one is cinnamon, save for the end of the shaft and
an elongate patch on the inner web near the tip which are blackish.
The third rectrix has nearly half of the web at the distal end
blackish, while the fourth rectrix is black, except for the basal half
of the outer web. The fifth has the cinnamon color still more re-
stricted, while on the sixth there is a mere wash of cinnamon near
the base of the outer web. The lower rump is cinnamon like the
upper tail coverts. The wings are distinctly washed with the
same color.
From Siptomis steinhachi, which was found near Mendoza in
the same area, /S. d. crassirostris differs in paler brown lower mandi-
ble, rusty throat patch, whiter under surface, lighter dorsal region,
browner crown, and in differently marked rectrices as indicated
under steinbachi.
As no typical specimens of cPorhignyii are at hand for comparison,
the individual from Mendoza is allocated subspecifically solely on its
agreement with Hellmayr's statement concerning crassirostris. A
skin presented to the United States National Museum by Mr. B. H.
Swales, collected by L. Dinelli near Colalao del Valle, Tucuman,
at an altitude of 2,500 meters, seems to stand intermediate between
d'orhignyii and crassirostris^ as the upper parts are more rufescent
than in the bird from Mendoza, though the tail is the same.
These birds usually were found in pairs that ran or hopped about
on the ground beneath the scattered bushes or clambered swifty
through the branches. When excited they chattered and called, and
worked rapidly away through the brush. They are characterized
by large size and distinctly reddish-brown coloration.
»Verh. Ornlth. Ges. Bayern, vol. 13, Feb. 25, 1917, p. 116.