BIRD LIFE IN THE URUBAMBA VALLEY OF PERU. 



59 



(618) BUTEO POECILOCHROUS Gurney. 



Buteo poedlochrous Gurney, Ibis, 1879, p. 176 (Yanayacu, Ecuador). 

 But^o melanosternus Berlepsch and Stolzmann, Omis, vol. 13, 1906, p. 104 

 (Cuzco). 



No two of four hawks from La Ray a are quite alike, nevertheless 

 it is evident that they represent but one species. They agree in size 

 with the measurements given for poecilocJirous and an adult female 

 agrees minutely with Gurney's description of that bird, A second 

 female is mixed rufous and brown above with the abdominal region 

 nearly uniform dark brown, the breast more ochraceous, the throat 

 streaked with blackish, the tail gray, inner vanes of outer feathers 

 and both vanes of central feathers whiter, all marked with wavy, 

 darker gray bars which are more regular on the lateral feathers. The 

 third female is apparently more adult, being intermediate between 

 the one just described and the bird resembling Gurney's type. The 

 male agrees %vith Gurney's plate of Buieo Jiypospodius ^* but has the 

 lower abdomen and tibiae barred with gray and white, the throat 

 white narrowly streaked with gray. An adult male from Mount 

 Chimborazo, Ecuador, agrees closely with Gurney's plate in color 

 but resembles the La Raya bird in size (see measurements that fol- 

 low). If, as I assume, it represents the fully adult male of poedlo- 

 chrous it is to be distinguished from the adult male of hypospodius only 

 bv its larger size. 



Measurements of Buteo ■poedlochrotLS. 



(626) RUPORNIS MAGNIROSTRIS OCCIDUA Bangs. 



Rupornis magnirostris occidua Bangs, Proc. Biol. Soc. Wash., vol. 24, 1911, p. 



187 (Rio Tambopata, Peru). 

 Rupornis nattereri Berlepsch and Stolzmann, Ornis, 1906, p. 99 (Santa Ana). 



These birds are intermediate between 7nagnirostris and nattereri. 

 They are in molt, the older plumage being brownish much as in 

 nattereri, while the ingrowing plumage is grayer and more like that 

 of magnirostris. The female is as gray below as the grayest 7nag- 

 nirostris while the male has as much cinnamon on the chest and bars 

 of the underparts as in some specimens of nattereri from Chapada, 

 Matto Grosso. 



Rio Comberciato, 1 male, 1 female. 



S8 Ibis, 1876, pi. 3. 



