From Cape Engaño we have received an immature female, which has the head and upper mantle whitish buff, with brown shaft-spots; there is the beginning of a short deep black superciliary band extending above the eye, while a few feathers of a more adult plumage are beginning to make their appearance on the occiput; these are brownish red, with a white subterminal black tip. (The appearance of this black eyebrow-stripe is very puzzling, as it does not appear in the adult plumage; it may be part of an intermediate plumage or fade with age and wear to the dark brown of the adult.) General color above brown, with irregular, ill-defined reddish white spots on either web; tail dark brown with two wide brownish white bands across the terminal half; chin and throat whitish buff. Sides of the head and under parts pale buff, with brownish red shaft-stripes, widest on the terminal half; thighs buff, with wide chestnut middles, constricted at intervals, so as to form ill-defined buff spots down the sides of the feathers, one or two half grown adult feathers on the left thigh. Wing, 386; tail, 272; tarsus, 86. "Although somewhat peculiar in plumage and large in size, I have no hesitation in referring this specimen to S. holospilus, and Mr. Whitehead shares the same opinion." (Grant.) 188. SPILORNIS PANAYENSIS Steere. PANAY SERPENT EAGLE. Spilornis panayensis Steere, List Birds & Mams. Steere Exped. (1890), 7; Grant, Ibis (1896), 527; Whitehead, Ibis (1899), 93; Sharpe, Hand-List (1899), 1, 266; McGregor and Worcester, Hand-List (1906), 42. Spilornis holospilus Bourns and Worcester, Minnesota Acad. Nat. Sci. Occ. Papers (1894), 1, 44 (part). Si-cub', Bohol. Bohol (McGregor); Guimaras (Steere Exp.); Masbate (Bourns & Worcester, McGregor); Negros (Steere Exp., Bourns & Worcester, Keay); Panay (Steere Exp.); Romblon (Bourns & Worcester, McGregor); Sibuyan (Bourns & Worcester, McGregor); Tablas (Bourns & Worcester, Celestino). "Adult male.--Head black, feathers of crest sulphur-white at base, then black, narrowly edged with whitish; rest of upper surface with wings light ashy brown, all the feathers edged with whitish. Tail broadly tipped with white and with two broad whitish bars and part of a third basal one; throat bluish ash, unmarked; rest of under surface pale cinnamon, shaded with ash and spotted and banded as in S. holospilus. Length, 502; wing, 317; tail, 229; tarsus, 71. Distinguished from S. holospilus by its small size and pale coloring." (Steere.) The validity of this species is somewhat doubtful. Bourns and Worcester consider that it "was founded on differences due to change of season and to individual variation." Grant thinks "that S. panayensis may fairly be recognized as a distinct form." Genus BUTASTUR Hodgson, 1843.