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

BIKDS OF ARGENTINA, PARAGUAY, URUGUAY, AND CHILE 357
the Rio Negro, below General Roca, Rio Negro, where an adult male
was shot November 27 and others were seen November 30. It resembled
other related species in actions and in high-pitched call
notes, but was shy and retiring. A fully grown young in spotted
plumage was recorded November 27.
The present species, in addition to the black crown, is distinguished
from T. rufiventris by the pale color of tarsi and feet.
TURDUS ALBICOLLIS Vieillot
Turdus albicolUs Vieillot, Nouv. Diet. Hist. Nat., vol. 20, 1818, p. 227.
(Brazil.)
An adult male was taken September 30, 1920, opposite Puerto
Pinasco on the eastern bank of the Rio Paraguay, where the birds
were fairly common on the wooded slopes of the Cerro Lorito. At
any alarm they flew in to view the cause, and perched with jerking
wings and tail, while they called with a robinlike pinip. When one
chanced to spy me, however, it dropped in the dense, low cover at
once and was lost to view. The one taken had the maxilla and tip
of mandible dull black; base of mandible primuline yellow; iris
bone brown ; bare eyelid and gape yellow ocher ; tarsus and toes fuscous.
The wing measures 105.2 mm.
Chubb ^^ has described a Paraguayan form of this thrush as Mervla
albicolUs faraguayemis^ from slrins secured at Sapucay, Paraguay,
which is said to " differ from the true M. alhicoUis Vieill. in being
olive brown above instead of rufous brown, while the gray band
across the throat is paler and narrower, and the white on the middle
of the abdomen more extended, imparting a whiter appearance."
My specimen when compared with a single skin from Brazil of uncertain
locality does not bear out these alleged differences, though
they may prove evident when suitable material is examined.
TURDUS AMAUROCHAUNUS Cabanis
Turdus amaurochalinus Cabanis, Mus. Hein., pt. 1, 1850, p. 5. (Brazil.)
This robin was recorded and collected as follows: Resistencia,
Chaco, July 10 (two males) ; Las Palmas, Chaco, July 13 to 31
(adult female, July 30) ; Riacho Pilaga, Formosa, August 6 to 18
(adult female, Augu.st 18)
; Formosa, Formosa, August 23 and 24;
Cerro Lorito, opposite Puerto Pinasco, Paraguay, September 30
(adult female) ; San Vicente, Uruguay, January 30, 1921 (juvenile
male) ; Lazcano, Uruguay, February 3 to 8 (juvenile male, February
; Rio Negro, L^ruguay, February 17 (adult female) ; Tapia, Tucu-
3)
man, April 13 (immature male and adult female). Specimens in
juvenal plumage resemble adults in general appearance, but are
^Ibis, 1910, p. 608.
54207—26 24