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376 BULLETIISr 133, UNITED STATES NATIONAL MUSEUM
dozen were found near Formosa, Formosa, August 24; two were recorded
at Puerto Pinasco, Paraguay, September 3; and at Laguna
Wall, 200 kilometers west of Puerto Pinasco, 20 were found on September
25. At Lavalle, Buenos Aires, November 2, a boy brought
me a male, too badly shot to preserve. The birds inhabited j>astures,
wet meadows, or recently burned stubble, where they worked about
in as inconspicuous a manner as possible. As a crouching attitude
usually concealed the brilliant red of the breast they were difficult
to make out. When startled they rose with uncertain, undulating
flight like that of pipits, and, though they might alight for a brief
space in bushes, soon dropped to the ground. As the primaries are
little longer than the secondaries, and the tail is short, they present
a curious appearance on the wing. After alighting in the grass the
wings are flitted several times, and as the bird walks about the tail
is frequently opened and shut in a nervous manner. Their call note
is a low chuck. As many as 20 were encountered in one scattered
flock.
PSEUDOLEISTES GUIRAHURO (Vieillot)
Agelaius guiraliuro Vieillot, Nouv. Diet. Hist. Nat., vol. 34, 1819, p. 545.
(Paraguay and Rio de la Plata.)
The present species, distinguished by its yellow rump, is noticeably
more yellow below than virescens when seen in the field. Near Laz-
cano, Uruguay, February 5, 1921, I saw a flock of six feeding on the
ground in an open pasture, where I was not able to approach within
gunshot. Near Rio Negro, Uruguay, on February 14, I collected an
adult male from two found in a stretch of open camp dotted with
bushes. From my limited experience, P. guirahuro seemed similar
in habits and general appearance to virescens, but its calls appeared
clearer and louder and the song stronger. The birds may have been
breeding near Rio Negro, as they rested in low tree tops and scolded
me with twitching tails. The one taken is in worn plumage and
has begun to molt the wing coverts.
PSEUDOLEISTES VIRESCENS (Vieillot)
Agelaius virescens, Vieillot, Nouv. Diet. Hist. Nat., vol. 34, 1S19, p. 543.
(Paraguay and Buenos Aires.)
Ps&udoleistes virescens, marked from its congener guirahuro by
its plain back and the restriction of yellow on the flanks, was en-
countered in greater abundance than in case of the related species.
It was seen during July, 1920, at Las Palmas, Chaco, but was not
collected until I reached Lavalle, Buenos Aires. The species was
common here from October 23 to November 15, and adult males were
collected October 23, November 6 and 13. In Uruguay the bird was
recorded at San Vicente, January 24 to February 2; Lazcano, Feb-