478 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



Adult male. — Head, neck, and chest dull black, passing into dusky 

 sooty brown on forehead; rest of upper parts dull grayish olive, much 

 lighter on rump and upper tail-coverts; lower parts from breast back- 

 ward dull white, tinged with buff posteriorly, especially on under tail- 

 coverts; breast, particularly on sides, indistincth" but rather broadh' 

 streaked with dusk}': l)ill l)lack, brownish on gonys; tarsi deep horn 

 brown; toes dusky. 



Immature male. — Above light grayish olive, the piieum rather 

 grayer, broadly but rather indistincth^ streaked with dusky, the feathers 

 of the back still more broadly but much less distinctly darker medially; 

 supraloral region, malar and suborbital regions, and entire under parts 

 dull grayish white, faintly tinged with yellowish buff, especially on 

 chest and breast, the former and sides of the latter broadly but yqvj 

 indistinctly streaked with grayish dusky; bill dusky horn color, light 

 brown on edge of maxilla and terminal two-thirds of mandible; tarsi 

 and toes brownish black. 



Adult female. — Above light grayish olive, the piieum obsoletely 

 streaked with darker and the feathers of the back and scapulars darker 

 centrally, producing an obsolete spotting; rump and upper tail-cov^erts 

 (juite uniform, the latter paler and grayer; wings and tail dusky 

 brownish gray, the feathers with light grayish oli^'e margins, the mid- 

 dle wing-coverts broadly tipped with this color, forming an indistinct 

 band, the greater coverts more narrowh' tipped with a paler and some- 

 what more buff}'' tint; lores, orbital region, cheeks, and under parts 

 dull grayish buffy whitish, tinged with dull buff on sides and flanks, 

 where obsoletely streaked with darker; ear-coverts very pale olive- 

 graj'ish, shading posteriorly into the darker color of the hindneck and 

 below into the dull whitish of the malar region; under wing-coverts 

 white, tinged along edge of the wing with pale yellowish buff'; maxilla 

 cinnamon-brown, becoming dusk}" at tip and on terminal portion of 

 culmen; mandible buff-yellowish; "iris dark brown;'' legs and feet 

 l)rownish black. 



Immature female. — Different from the adult only in the wing- 

 markings, both the middle and greater coverts ha^dng much nar- 

 rower and more sharply detiued terminal margins of buffy whitish, the 

 secondaries similarly but less distinctl}' marked. 



J/ffZe.— Length (skins), about 134.62; wing, 70.36-T6.20 (72.90); 

 tail, 41.91-46.99 (44.96); culmen, 14.99-15.49 (15.24); gonys, 7.62; 

 width of mandible at base, 8.64-9.40 (9.14); depth of bill at base, 

 10.92-11.94 (11.43); tarsus, 22.86-24.13 (23.37); middle toe, 15.24- 

 16.51 (15.75).' 



i^^w,«Z6.— Length (skins), about 107.95-119.38(113.66); Aving, 65.23- 

 70.36 (68.58); tail, 40.64-44.45 (43.18); culmen, 13.97-15.49 (14.73); 



^ Three specimens, one each from James, Charles, and Indefatigable islantls; only 

 the first adult. 



