30 
ZOOLOGY OF THE VOYAGE OF THE BEAGLE. 
about | of an inch wide, of the same brown, as the rest of the upper sur- 
face ; extremities tipped with very pale dirty brown. Tail-coverts ; upper 
ones brown, and the under ones white, with small brown spots on the shaft 
towards their extremities. Under surface. — Chin, pale fulvous, or ochre 
yellow. Breast, belly, thighs and under tail-coverts the same ; the feathers 
on the lower part of the breast and on the belly have a dark brown mark 
* along the shaft, which widens but very little towards the extremity ; the 
brown on those on the upper part of the breast and on the throat is broader, 
and some of the feathers are of a darker fulvous, and as the dark brown of 
the back encroaches on each side, this part is much darker than the rest of 
the under surface. Above this, and just beneath the chin, a kind of collar is 
formed from ear to ear, of short feathers of a more strongly pronounced fulvous 
tint, with a narrow brown streak on their shafts. Lining of wings, and flanks 
almost white, with transverse brown bars. Under side of tail pale gray 
passing into fulvous, with the terminal dark brown bars seen through. Bill, 
horn-coloured, with some white markings towards its base ; tarsi bright 
yellow. 
Form. — Third primary rather longer than fourth, second equal to fifth ; first more 
nearly equal to the sixth than to the seventh. Wings reaching within an 
inch of the end of the tail. Feathers on thighs depend but little below the 
knee. 
Total length . 
Wings folded . 
Tail 
In. 
22 
17 
10 ^ 
Tarsi . . . . . 
Middle toe to end of claw 
From tip of bill to nearest part of cere 
Habitat, Maldonado, La Plata, (July.) 
2f 
This hawk was not uncommon on the grassy savannahs and hills in the 
neighbourhood of the Rio Plata. Mr. Gould remarks “that in size it fully equals 
the Circus ceruginosus of Europe, which it doubtless represents in the countries it 
inhabits. This species has a remarkable specific character in the lanceolate and 
conspicuous stripes down its breast.” 
2. Circus cinerius. Vieill. 
Circus cinerius, Vieill. Ency. Meth. 
Falco histrionicus, Quoy and Gaim. Voy. autour du monde, Plate 15. 
Circus histrionicus, Vigors , Zoological Journal, vol. iii. p. 425, note. 
My specimens were obtained at the Falkland Islands, and at Conception in 
Chile. M. D’Orbigny states that it is a wild bird ; but at the Falkland Islands it 
