187 
the Province of Buenos Ayres. 
76. Strix flammea, Linn. 
Nocturnal, 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. 1. s. c. 
Rarely seen so far north as the city, hut occasionally oc¬ 
curring here. Legs, feet, and iris orange. 
78. Asturina pucherani, Scl. et Salv. Ex. Orn. 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. 
A-79. Buteo albicaudatus, Vieill.; 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 eemoralis (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. 
