30 



ZOOLOGY OF THE VOYAGE OF THE BEAGLE. 



about I 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 



In. 



3i 



21 



Habitat, Maldonado, La Plata, (July.) 



This hawk was not uncommon on the grassy savannahs and hills in the 

 neighbourliood of the Rio Plata. Mr. Gould remarks "that in size it fully equals 

 the Circus ceruginosiis 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 Concepcion in 

 Chile. M. D'Orbigny states that it is a wild bird ; but at the Falkland Islands it 



