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336 BULLETIN 133, UNITED STATES NATIONAL MUSEUM
whit iiihir-r-r-r whit. The species was recorded west to Kilometer
200.
MYIARCHUS SORDIDUS Todd
Mylarchus sordidus Todd, Proc. Biol. Soc. Washington, vol. 29, June 6,
1916, p. 96. (EI Trompillo, Carabobo, Venezuela.)
An adult male secured near San Vicente, in extreme eastern Uruguay,
January 81, 1921, is listed under sordidiis with reservation.
Todd, in his review of the o-enus Myiarchus^^^ examined this bird
and marked it '"'' Myiarchus sp. (near sordidus).'''' After study and
comparison with Todd's revision of the genus it appears that the
specimen shows the characters of darker dorsal surface that dis-
tinguish sordidus from pelzelni., and under present understanding
of the group it can be listed only as sordidus. It may be noted that
Todd ^^ records sordidus from Rio Grande do Sul, so that eastern
Uruguay is not a remarkable extension of range, especially since
other south Brazilian species were obtained at the same point.
The bird was shot in heavy brush bordering the Laguna Castillos.
MYIARCHUS PELZELNI Berlepsch
Myiarchus pelzelni Berlepsch, Ibis, 1883, p. 139. (Baliia, Brazil.)
The present species was found near Victorica, Pampa, where an
adult female was secured December 24, 1920, and an adult male and
a young female December 27. The adult male is much grayer above
than the female and has little yellow below. The young bird, not
yet fully feathered, is yellower on the abdomen, and has rectrices
and remiges margined with cinnamon.
The birds were found in heavy growth of the semiarid, open
forest of low, thick-trunked trees characteristic of this region, where
they were located through their low-pitched mournful whistled
calls.
MYIARCHUS FEROX SWAINSONI Cabanis and Heine
Myiarchus swainsoni Cabanis and Heine, Mus. Hein., pt. 2, 1859, p. 72.
(Brazil.)
The present bird resembles M. t. tyrminulus superficially, but has
a smaller bill and lacks the rufescent coloring in the tail. The bird
was recorded at Resistencia, Chaco, July 8, 1920 (male taken) ; Las
Palmas, Chaco, July 17 to 31 (two males July 17 to 21) ; and Tapia,
Tucuman, April 8 to 13, 1921 (male shot April 8). They were
found in open woods in fair numbers. In feeding they hopped
easily about among twigs and leaves, snatching at insects, and occa-
sionally resting stationary for a time.
""See Proc. Biol. Soc. Washington, vol. 35, Oct. 17, 1922, pp. 181-218.
=° Idem, p. 197.