Gray-backed Hawk

Here the details of the Gray-backed Hawk named bird below:

SCI Name:  Pseudastur occidentalis
Protonym:  Leucopternis occidentalis Ibis p.496
Taxonomy:  Accipitriformes / Accipitridae / Pseudastur
Taxonomy Code:  gybhaw2
Type Locality:  western Ecuador.
Author:  Salvin
Publish Year:  1876
IUCN Status:  Endangered

DEFINITIONS

PSEUDASTUR
(Accipitridae; Ϯ White Hawk P. albicollis) Gr. ψευδος pseudos  false; genus Astur de Lacépède, 1801, goshawk; "7. THRASAËTINÆ.  Pseudastur, ‡  Thrasaëtus, Morphnus, Spizaëtus.   ...   ‡ Type, Falco pœcilonotus, Cuvier, v. F. scotopterus, Pr. Max. (Pl. Col. 9.)" (Blyth 1850); "Pseudastur Blyth, Cat. Bds. Mus. Asiat. Soc., p. 24, 1849 [or 1852]—type, by monotypy, Falco poecilonotus Temminck = Falco albicollis Latham." (Hellmayr & Conover, 1949, XIII, 169).

occidentale / occidentalis
L. occidentalis  western  < occidens, occidentis  west  < occidere  to set. This toponym was frequently given to taxa discovered in locations west of previously known populations.
● Cocal, Western Andes, Colombia (Dysithamnus).
● Jamaica; ex “Onocrotalus” or “Pelecanus fuscus” of Sloane 1725, “Pelican of America” of Edwards 1747, and “Pelecanus” of Browne 1756 (Pelecanus).
● TL. Day Dawn, Western Australia; "Westralian Wedgebill" (Mathews 1912) (Psophodes).