MICROPUS. | | 361 
Genus MICROPUS Meyer and Wolfe, 1810.* 
Tarsus well feathered in front; outer toes more or less reversible ; 
claws strong ; tail decidedly forked ; rectrices pointed but not stiff; nostril 
opening oval with a median septum which is not plainly seen in the dry 
specimen. 
Species. 
a. Larger; wing, more than 160 mm.; feathers of breast tipped with white. 
pacificus (p. 361) 
a, Smaller; wing, less than 150 mm.; feathers of breast uniform blackish. 
subfurcatus (p. 362) 
325. MICROPUS PACIFICUS (Latham). 
WHITE-RUMPED SWIFT. 
Hirundo pacifica LATHAM, Index Orn. Suppl. (1801), 58. 
Micropus pacificus HARTERT, Cat. Birds Brit. Mus. (1892), 16, 448. 
Cypselus pacificus SHARPE, Hand-List (1900), 2, 96; McGregor, Phil. Jour. 
Sei. (1907), 2, sec. A, 339 and 346, pls. 4 & 5, fig. 1; OATES and REID, 
Cat. Birds’ Eggs (1903), 3, 81. 
Batan (McGregor, Mearns); Camiguin N. (McGregor). Eastern Siberia, 
China, Japan, Formosa, Burmese provinces, Assam, Manipur; in winter to 
Australia. 
Adult.—General color blackish brown; a broad rump-band white, its 
feathers with brown shafts; upper parts with a slight oil-green gloss; 
loral feathers white with black tips; chin and throat white with narrow 
dusky shaft-lines ; sides of head and neck light dingy brown; under parts 
and under wing-coverts brown, each feather with a wide white fringe 
and a deep brown subterminal band; under tail-coverts narrowly fringed 
with white. Iris brown; bill and nails black; feet blackish brown. 
Length, 184 to 190. A male measures: Wing, 182; tail, 77; depth of 
fork, 29; bill from frontal feathers, 7. A female measures: Wing, 178; 
tail, 77; depth of fork, 29; bill from frontal feathers, 8. 
This handsome swift was observed in large numbers on Batan Island 
and all of our specimens were killed within the town of Santo Domingo 
de Basco. Near the summit of Mount Araya (1,160 meters) numbers 
of these birds were seen in their graceful and powerful flight. 
*Some authors prefer Apus Scopoli, 1777, for this genus; Dr. Sharpe uses 
Cypselus Illiger, 1811. Cf. Hartert, Das Tierreich (1897), 1, 83; Sharpe, Hand- 
List, (1900), 2, (introduction) ; Allen, Awk (1901), 18, 121. 
