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346 BULLETIN 133, UNITED STATES NATIONAL MUSEUM
Their call is a flat chu chu cJiwp that has little carrying power.
Diirino; the breeding season males often circled about witli stiffly
held, decurved wings that formed an inverted A. They nested
frequently in the mud nests of the hornero {Furnarhis rvfi(M).
PROGNE CHALYBEA DOMESTICA (Vieillot)
Hirundo domestica Vieillot, Nouv. Diet. Hist. Nut, vol. 14, 1S17. p. 52(X
(Paraguay and Rio de la Plata.)
In winter the present species was found in the central and north-
ern portion of the Chaco, while in summer it was more widely
spread. It was recorded as follows: Formosa, Formosa, August 2S
to 24, 1920; Puerto Pinasco, Paraguay, September 1 to 3, (adult
male taken September 3) ; Kilometer 80, west of Puerto Pinasco,
September 6 to 20 (female taken September 19) ; Buenos Aires,
Argentina (on the Avenida de Mayo in the heart of the city), Octo-
ber 17; Dolores, Buenos Aires, October 21; Lavalle, Buenos Aires,
October 20 to November 10 (male shot October 31) ; Santo Domingo,
Buenos Aires, November 17 (male taken) ; Carrasco, IJiu-
guay, January 9 and 16, 1921; La Paloma, Uruguay, January 23;
Lazcano, Uruguay, February 5 to 8; Corrales, Uruguay, February
10; Rio Negro, Uruguay, February 15; Mencloza, Mendoza, March
14. This form differs from typical chalybea in larger size and more
extensive whitish tips on the feathers of throat and upper breast.
In notes and actions similar to Progne subis, these martins were
fairly common about many of the towns that I visited. In the
pampan region they nested in crevices and openings about roofs and
cornices of houses, while in the north it was common to see them
about oj^enings in palm trees. In Paraguay, birds were observed
examining nest sites on September 3, while a male taken at Lavalle,
Buenos Aires, on October 31, was in full breeding condition. On
February 10, at Corrales, eastern Uruguay, 50, including many
3^oung, had gathered in a flock that rested on telephone wires. Males
during the breeding season were active in the pursuit of carranchos
{Polyhorus) and other hawks.
PROGNE ELEGANS Baird
Progne elegans Baikd, Rev. Amer. Birds, May, 1SG5, p. 275. (Bermejo
River, Argentina.)
The present species was found at General Roca, Rio Negro, on
November 24, 1920, when two adult males were taken along the
Rio Negro, and again on November 27, when it was found in town
as well as in the country. An adult female that I shot fell in the
river and was swept away in the swift current. On December 19,
at Carhue, Buenos Aires, a pair examined crevices among the rafters