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116 BULLETIN 133^ UNITED STATES NATIONAL MUSEUM
The two taken are males in molt from an immature to adult
plumage. Old feathers still appear in wings and tail, but elsewhere
have been replaced, though all of the new feathers are not fullygrown.
The narrow bars on the under surface are mainly dark
gray, or grayish brown with little mixture of rufous. These two
measure as follows: Wing, 164-171; tail, llT-123.5; culmen from
cere, 9.6-10 ; tarsus, 47-50 mm.
Swann - treats Accipiter salvini Ridgway from Venezuela as a
subspecies of A. erythronemius.
Order GALLIFORMES
Family CRACIDAE
ORTALIS CANICOLLIS (Wagler)
%
Penelope canicolUs Wagler, Isis, 1830, p. 1112. (Paraguay.)
Nine specimens, all adult, secured in the Chaco were taken as
follows: Riacho Pilaga, Formosa, August 13, 14 (one skeleton),
18 (one in alcohol), and Kilometer 80, Puerto Pinasco, Paraguay,
September 6, 10, and 20 (two). At Puerto Pinasco the birds were
found inland to Kilometer 200. Birds from the two localities are
similar; males are larger and usually paler on the posterior dorsal
surface than females. A female taken August 13 at the Riacho
Pilaga had the soft parts as follows: Bill fawn color; soft operculum
over nostrils, and space behind hair brown; bare skin on
sides of head fawn color, on throat tinged with Pompeian red; iris
army brown; tarsus and toes avellaneous; claws fuscous. The skin
of the throat was more heavily tinged with red in males than in
females.
The charata as Ortalis canicolUs is usually Icnown was a common
species in the more extensive forests of the wilder, less-frequented
portions of the Chaco. It was typically a tree-haunting
bird that frequented open tree limbs, the borders of trails or edges
of groves where dense cover close at hand furnished shelter at any
alarm. They were found in bands that included from four to eight
individuals, until in September they separated in pairs for the pur-
pose of breeding. On days with high wind when hunting in suit-
able sections I saw them in numbers, though ordinarily the slight
sounds that I made in passing through the monte were sufficient to
cause the alert birds to hide. Frequently flocks descended to feed on
or near the ground, but when alarmed rose at once into the tree-
tops. Once I startled one badly in a forest path so that it rose with
roaring wings like a tinamou or pheasant but usually the flight was
silent. When alarmed, if low down they towered with rapidly
^Syn. Accipitres, ed. 2, pt. 1, Sept. 28, 1921, p. 58.