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

BIEDS OF ARGENTINA, PARAGUAY, URUGUAY, AND CHILE 101
The species may not have been taken in the Territory of Pampa
before, as the " Biga de la Paz, Pampa," of Burmeister may refer
to the town known as Paz in southern Santa Fe. At Victorica the
species is near its southern range, though it may range south to the
limit of the Pampan monte, somewhere northwest of Bahia Blanca.
With the destruction of this forest for wood, the bird will, of ne-
cessity, become extinct in this area through lack of suitable cover.
In parts of the Province of Cordoba Spiziapteryx may be common,
as on April 19, 1921, between Quilino and Cordoba, from a
train window I noted 8 or 10 at rest in the morning sun, perched
like sparrow hawks on dead stubs or telegraph poles. The species
has been reported previously from Santa Fe ( ? ) , Mendoza, Cordoba,
Santiago del Estero, Catamarca, La Rioja, Tucuman, and Salta.
CERCHNEIS SPARVERIA CINNAMOMINA (Swainson)
Falco cinnaniominns Swainson, Anim. Menag., 1838, p. 281. (Chile.)
Treatment of the sparrow hawks from the southern part of South
America, with existing material, is difficult and uncertain. Two
forms are currently recognized, australis of Ridgway of eastern and
northern range, and clnnainomina of Swainson, described from
Chile. These two differ inter se in size, in the marking of the tail
and to a slight degree in coloration of the under surface. Material
in the United States National Museum representing them is far from
satisfactory, but from study of this and from literature it appears
that the male of cirmaTnomina differs from austraZis in larger size
(wing 187-199, average 193; tail 129-143, average 134 mm.), in narrower
subterminal band on the tail (9-16 mm.), in more or less
rufous on the tips of the rectrices, and in having the outer rectrix
W'ith only one bar (rarely more) and the inner web rufescent. The
female has the wing 197-209 mm., and the black bars on the rec-
trices narrower and less complete. In the male of australis, as
represented by birds from Brazil, the wing is shorter (175-185, average
181; tail, 122-131; average 127 mm.), subterminal tail band
broader (18-22 mm.), tail tipped with white or gray, inner web
of outer rectrix white, with three or more black bars, and the under-
parts whiter. The female has the wing 179-190 mm., the black bars
on the tail wider, more complete, and the subterminal band wider.
Skins from Patagonia and the eastern base of the Andes in Argentina
agree well with c'lnnaiiKytnina. Those from the pampas
region northward into Uruguay and Paraguay are more or less inter-
mediate between cinnamomina and australis. This broad area of
intergradation between the two forms, as here considered, is puzzling,
but may be explained in a way by considering some of the inter-
mediates taken in the north that most nearly resemble typical cinnamomina^
as possible winter migrants from more southern breeding
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