60. ROSTHEAMUS. 



327 



to narrow black shaft-stripes on the lower breast and abdomen, the 

 flanks indistinctly barred near the base with brown ; under tail- 

 coverts fulvous, washed with rufous; under wing-coverts rufous, 

 with black shaft-stripes, the lower ones greyish ; cere and base of 

 biU greyish white, the tips of the latter blackish; feet greyish 

 white; ins pale yellow. Total length 19 inches, culmen 1-4, wing 

 18-1, tail 10-3, tarsus 1-9. 



Young. Paler than the adult, the rufous colour nowhere so rich, 

 and the black chest-markings almost wanting ; no grey on cheeks or 

 sides of neck. 



Hab. Australia. 



a. Ad. St. 



b. Juv. st. 



Swan River, Australia. 

 Australia. 



Purchased. 

 Zoological Society. 



60. ROSTHRAMUS. 



Type. 



Rosthramus, Less. Traite, p. 55 (1831) R. sociabilis. 



Hamirostrum, Sundev. av. Tent. p. 108 (1873) R. sociabihs. 



Bill and foot of Eosthramus leueopygus. 

 Range. Florida, Antilles, Guiana, Amazonia to Brazil and Peru. 



Key to the Species. 



, Upper tail-coverts grey, like back. 



?,'• ^^^ S^^J' "^^^ ^ ^^oad black band at tip sociabilis, p. 327. 



6. Tail grey, with white base, and three white 



bands across it tceniurm p. 328 



Upper and under tail-coverts white ' leucopygus, p. 328, 



1. Rosthrainus sociabilis. 



Gavilan del estero sociabile, Azara, Apunt. i. p. 84 (1802) • Haril 

 Ind. Azara, p. 2 (1847). tf \ j , 



Herpetotberes sociabilis, VieiU. N. Bict. xviii. p. 318 {ex Azara). 



Falco hamatus, IlUger, in Temm. PI. Col. i. pis. 61, 231 (1823) • Max 

 Beitr. Naturg. Bras. iii. p. 182 (18-30). 



Buteo hamatus, Bonn, et Vieill. Enc. Meth. iii. p. 1223 (1823). 



Cymindis hamatus, Vigors, Zool. Journ. i. p. 337 (1824). 



