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

248 BULIjETIN 133, UNITED STATES NATIONAL MUSEUM
nest I found five eggs, all pierced by the bill of some bird. On November
16 I collected a set of four fresh eggs, with one of Molothrus
honariensis five leagues east of Santo Domingo, Buenos Aires, from
a nest placed on top of a fence post. The side of one of the eggs
had been broken when the nest was opened. Three of the eggs
in this set are normal, while one is considerably dwarfed. They
measure, in millimeters, as follows: 30.9 by 21.6; 30.7 by 21.7: 29.8
by 21.2; and 21.4 by 17.6.
FURNARIUS RUFUS PARAGUAYAE Cherrie and Reichenberger
Furnarius rufus paraguayae Chebkie and Reichenbekgee, Amer. Mus.
Nov., no. 27, Dec. 28, 1921, p. 5. (Puerto Pinaf^co, Paraguay.)
The Paraguayan ovenbird was recorded at the following localities
Resistencia, Chaco, July 5 to 10 (adult female, taken July 8)
Palmas, Chaco, July 13 to 31 (adult male and female, shot July
:
; Las
31) ; Formosa, Formosa, August 5, 23, and 24; Eiacho Pilaga,
Formosa, August 7 to 21 (adult female, August 7, adult male,
August 11) ; Puerto Pinasco, Paraguay, September 1, 3, and 30;
Kilometer 80, west of Puerto Pinasco, Paraguay, September 6 to 21
(adult female, on September 17).
This recently described form is smaller and darker colored than
F. r. y'w/ws, and, though similar in measurements to F.r.conunersonij
is much duller (less rufescent), especially on the back. In F. r. rufus
(15 specimens) from the Province of Buenos Aires, Uruguay, and
extreme southern Rio Grande do Sul (one specimen from Quinta,
between Rio Grande do Sul and Pelotas) the wing measures from
97-104 mm. Seven skins of F. r. paraguayae from Chaco, Formosa
and Paraguay (Sapucay and 80 kilometers west of Puerto Pinasco)
range from 90-95.2 mm., while four F. r. comTnersoni from Urucum,
Matto Grosso (loaned for examination by the American Museum of
Natural History) measure from 90.4r-94.4 mm. Specimens from
Resistencia and Las Palmas are only slightly darker than birds
from Buenos Aires, but are so small (wing, 92.4, 94.3, and 95 mm.)
that they are best placed with paraguayae. Skins from the interior
of Formosa are darker even than one from near Puerto Pinasco, the
type locality. It would appear that F. r. j)(iraguayae ranges in the
Argentine and Paraguayan Chaco, and in an indeterminate area
east of the Rio Paraguay in Paraguay, while F. r. rufus extends
from Bahia Blanca and Guamini northward into central Uruguay
(Rio Negro), and probably into southern Santa Fe.
Allocation of records for ovenbirds that I made at Tapia, Tucuman,
from April 7 to 14, 1921, is uncertain, since Cherrie and Reichenberger
consider birds from Perico, Jujuy, and Embarcacion,
Salta, intermediate but nearer F. r. covimersoni.