i1. Tarsus with hexagonal scales in front; wing falling far short of tip of tail; lower plumage whitish, barred or spotted with brown. ... Butastur (p. 230) i2. Tarsus with transverse scutes in front; wing very long, extending beyond end of tail; plumage chestnut and white in adult. ... Haliastur (p. 233) h2. Back of tarsus with large transverse plates; wing over 500 mm. ... Haliæetus (p. 232) d2. Tail slightly forked, middle feathers about 10 mm. shorter than outermost; unfeathered portion of tarsus covered with small round scales. ... Elanus (p. 234) c2. Feathers of lores and large circumocular area short and scale-like; no hairs about the bill; tarsus covered with long feathers for more than half its length, unfeathered portion with small hexagonal scales on all sides. ... Pernis (p. 235) b2. Bill with one or two well-developed teeth on its cutting edge; first primary nearly as long as second and usually longer than third. c1. Head crested; tarsus feathered for half its length. ... Baza (p. 236) c2. Head not crested; tarsus feathered at base only and covered with hexagonal scales. d1. No tubercle in nostril; length less than 200 mm. ... Microhierax (p. 238) d2. A tubercle in center of nostril; length more than 250 mm. ... Falco (p. 239) a2. Tail distinctly graduated; bill shorter; feet smaller and weaker; middle toe without claw two-thirds to three-fourths of tarsus; wing less than 250 mm. ... Cerchneis (p. 243) Genus LOPHOTRIORCHIS Sharpe, 1874. Cutting edge of bill sinuate; a narrow occipital crest about 60 mm. long; wing moderate in length; first primary very short; third and fourth subequal; inner web of first four quills abruptly and deeply cut; legs closely feathered to base of toes which are covered with small hexagonal scales; claws strong and curved. 182. LOPHOTRIORCHIS KIENERI (Geoffroy St. Hilaire). RUFOUS-BELLIED HAWK. Astur kienerii Geoffroy St. Hilaire, Mag. de Zool. (1835), cl. 2, pl. 35. Lophotriorchis kieneri Sharpe, Cat. Birds Brit. Mus. (1874), 1, 255; Hand-List (1899), 1, 262; Grant, Ibis (1895), 438; McGregor and Worcester, Hand-List (1906), 42. Luzon (Heriot, Whitehead); Marinduque (Steere Exp.); Mindanao (Steere Exp., Celestino); Panay (Steere Exp.); Sibuyan (McGregor); Tablas (Celestino). Malay and Indian Peninsulas, Lesser Sunda and Indo-Malayan Islands, Indo-Chinese provinces, Ceylon, Celebes.