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BIRDS OF ARGENTINA, PARAGUAY, URUGUAY, AND CHILE 227
fallax Boiircier, as not applicable to T, chionogaster Tschudi, which
he says should probably be placed in Talophoriis ]Mulsant.
The two or three individuals of this species seen were observed at
the flowers of a common red-flowered epiphyte {Psittacanthns cuneifolius)
that was attractive to other hummers in the region. They
hovered with humming wings in order to probe the long tubed
blossoms, and at short intervals paused to rest on some convenient
perch. Their call note was a low chit chit suggestive of that of
SappJiO.
One of the birds when taken had the base of the mandible deep
Corinthian red, and the remainder of the bill and the feet black. In
the other the base of the mandible was vinaceous fawn ; maxilla and
tip of mandible black ; tarsus and toes aniline black.
The plate in Tschudi's work on which the species is depicted was
made previous to the writing of the text as it is lettered Trochilus
leucogaster^ a name proposed for another hummer, so that in the text
change was made to chio nogaster. No definite type locality is given
by Tschudi so that Peru is assumed.
HYLOCHARIS CHRYSURA (Shaw)
Trochilus clirysxirus Shaw, Gen. Zool., vol. S, pt. 1, 1812, p. 335. (Para-
guay.)
Four specimens of this interesting hummer were taken as follows
A female at the Kiacho Pilaga on August 14, 1920, a female at Kilo-
meter 25, a male at Kilometer 80, and a second male on the Rio
Paraguay near Puerto Pinasco, Paragiia} , on Sej)tfmber 1. 1."), and
30. These four specimens present a puzzling combination of differ-
ences that with available material may not be treated satisfactorily.
The two females from Formosa and Paraguay, with a culmen
measurement of 20 and 21.5 mm., respectively, and a wing 52.5 mm.
long, agree fairly well with birds from Buenos Aires and offer noth-
ing M orthy of comment. A male taken on the Cerro Lorito on the
eastern bank of the Paraguay River opposite Puerto Pinasco has
the culmen 20.2 mm. and the wing 50 mm. It differs from any others
in the small series examined in having the entire maxilla dull black,
as well as the distal half of the mandible. In skinning this bird
I marked it as sexually fully adult, but it may be that the black bill
is still an indication of an immature condition. The last specimen,
a fully adult male, from the Chaco at Kilometer 80, with the culmeji
18.6 mm. and the wing 51.4 mm., in its small bill suggests the form
named mcLxiuelli by Hartert ^^ from the plains near Reyes on the Rio
Beni in northern Bolivia. Hartert records that specimens from
Matto Grosso seem intermediate between his form and the typical
^ Hylocharis ruficolUs maxwelli Hartert, Nov. Zool., vol. 5, December, 1898, p. 519.
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