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 com- 

 mon, 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 nar- 

 rower 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, aver- 

 age 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 Ar- 

 gentina 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 cin- 

 namomina^ as possible winter migrants from more southern breeding 



54207—26 8 



