344 BULLETIN 133, UNITED STATES NATIONAL MUSEUM 



that Hirundo cyanoleuca Vieillot will eventually be transferred to 

 the bird noAv Imown as P. patagonica^ while P. cyanoleuca auct. will 

 become P. minuta (Maximilian)-^*' The matter, hoAvever, is best left 

 in abeyance pending more extended collectino; in Corrientes and 

 Paraguay. 



PYGOCHELIDON PATAGONICA PATAGONICA (d'Orbigny and Lafresnaye) 



Hirundo patayonica cI'Okbigny and Lafresnaye, Mag. Zool.. 1837, cl. 2, 

 p. 69. (Patagonia.) 



The present swallow is the most common species of the present 

 family in Argentina. Records, based on specimens, of the occur- 

 rence of this bird are as follows: Kilometer 200, west of Puerto 

 Pinasco, Paraguay, September 24 (male taken) and 25, 1920 (the 

 most northern record for the species in the interior) ; Carhue, 

 Buenos Aires, December 15 to 18 (immature male, December 18) ; 

 Guamini, Buenos Aires, March 4 to 8, 1921 (four skins, adults and 

 immature of both sexes) ; General Roca, Rio Negro, November 27 

 to December 3 (adult female, November 27) ; Zapala, Neuquen. 

 December 8 (adult female) ; Potrerillos, Mendoza, March 17 to 21 

 (adult female, March 19). 



The following records are assumed to represent this species, but 

 identification was not checked by the collection of skins; Puerto 

 Pinasco, Paraguay, September 3 ; Formosa, Formosa, August 24 ; 

 Riacho Pilaga, Formosa, August 9 to 21; Las Palmas, Chaco, July 

 14 to 31 ; Dolores, Buenos Aires, October 21, Lavalle, Buenos Aires, 

 October 23 to November 13; Ingeniero White (near Bahia Blanca), 

 Buenos Aires, December 13; Tunuyan, Mendoza, March 22 to 29. 

 A northern subspecies of this bird from Peru, P. p. peruviana 

 Chapman, differs from the typical form in smaller size, and paler 

 under wing coverts. It is possible that P. fiavipes Chapman,''^ 

 based on a single skin from Maraynioc, Peru, represents merely an 

 immature phase of cyanoleuca. An immature female, cyanoleuca^ 

 from Matchu Picchu, Peru, shot June 25, 1915, (Cat. No. 273,300 

 U. S. N. M.,) has the feet and tarsi decidedly yellowish brown. 



Though it has been stated that the light external margin of the 

 outer rectrices is found in patagonica alone, I have noted it in 

 slight degree in skins of cyanoleuca from Costa Rica, Colombia, 

 Peru, and Uruguay. 



During winter, in the Chaco, these little swallows were found in 

 flocks about lagoons where they often rested on tufts of grass in 

 the water, or after hawking about for insects in the dusk sought 

 roosts among the rushes. One shot, September 24, was fat and in 



^Hirundo minuta Maximilian, Reis. Brasilien, vol. 2, p. 336. (Rio de Janeiro, 

 Brazil.) 



s^Am. Mus., Nov., no. 30, Feb. 28, 1922, p. 8. 



