the Province of Buenos Ayr es. 187 



7Q. Strix flammeAj Linn. 



iNTocturnalj and more often heard than seen. For nesting 

 it takes possession of Pigeon-cots^ or resorts to holes in steep 

 banks^ where it screeches at night like our White Owls at 

 home. 



77. Circus cinereus (Vieill.) ; Scl. et Salv. I. s. a. 

 Rarely seen so far north as the city^ but occasionally oc- 

 curring here. Legs, feet, and iris orange. 



78. AsTURiNA pucHERANi, Scl. ct Salv. Ex. Om. p. 177, et 

 P. Z. S. 1869, p. 634. 



Resident and common. A sluggish lazy bird, fond of shady 

 secluded places ; it may always be found in the riverain wood, 

 appearing almost as motionless as the stump or bough on 

 which it is perched. Its food consists of rats, mice, frogs, 

 and sometimes grasshoppers. In the immature bird the 

 iris is grey with a tinge of yellow ; cere, legs, and feet pale 

 orange. In the adult the iris is pale orange ; cere, legs, and 

 feet dark orange. The plumages of the immature and adult 

 birds also differ exceedingly ; but their changes are now well 

 known. 



79. BuTEO ALBicAUDATUs, Vicill. ; Scl. et Salv. P. Z. S. 

 1869, p. 634. 



Resident and not uncommon. It has a curious whistling 

 note, which it constantly utters while on the wing. Iris light 

 reddish brown. Cere flesh-colour. Beak pale slate, tip 

 darker. Legs and feet pale orange. 



80. Hypotriorchis femoralis (Temm.) ; Scl. et Salv. 

 P. Z. S. 1868, p. 143. 



Winter visitor, but not common — the only specimen I have 

 obtained being an adult female, shot by a friend on the 16th 

 of last July. The female is larger than the male ; and the 

 colours of her plumage are not so clear and well defined. 

 The stomach of this specimen contained the remians of a 

 small bird. Cere pale lead-colour. Iris dark brown. Legs 

 and feet very pale orange. 



