2330 The Zoologist — October, 1870. 



black, the larger wing-coverts just appreciably white-margined; 

 scapulars almost entirely pure white, forming two conspicuous broad 

 longitudinal bands. Under wing-coverls dusky brown ; inner webs 

 of the primaries the same, not fading, even at their extreme bases, 

 into whitish. Entire under parts pure white, immaculate, except 

 some dusky streaks on the long feathers of the sides and flanks. This 

 white on the sides of the head invades the lores to the level of the 

 top of the orbits, and extends into the nasal fossae ; then lowers a 

 little, so that the eyes are left in the dark colour of the top of the 

 head ; then on the nape extends almost to the median line, across 

 which a few white feathers extend to the white on the other side, 

 forming an imperfect nuchal collar ; then extends in a straight line 

 down the middle of the side of the neck. On the sides of the rump 

 the white extends around so far that the cinereous is only left as a 

 band an inch wide. This white on the sides of the rump is as apparent 

 upon the upper surface as that on the scapulars ; it is directly con- 

 tinuous with that of the under parts, but on the flanks the long 

 overlying cinereous feathers appear to separate it. Bill wholly black. 

 Tarsi posteriorly and toes inferiorly blackish ; rest of the feet, including 

 both surfaces of the webs, probably flesh-coloured in life; dull yellowish 

 white in the dried skin. 



Length " lO'OO, extent IS'OO" (collector's label) ; wing from carpus 

 500 ; tail TSO ; tarsus '70 ; middle toe without claw 'OS, its claw ^O; 

 outer toe and claw MO; inner toe and claw -88; bill along culmen 

 •60, along rictus 1*25, along gonys '45, its height at base of nostrils 

 •2-2, its width at same point '19. 



Young (described from a specimen in the Smithsonian Museum, 

 from Sitka, July, 1866; just fully fledged; the bill has still the white 

 horny knob at lip of upper and under mandible, showing the juvenility 

 of the specimen). — Bill very small, weak, short, imperfectly developed, 

 about a third as long as the skull; -45 along culmen; tarsus "55 ; 

 middle toe and claw I'OO; wing only 425. Entire upper parts 

 blackish, much darker than in the adult, with only a just appreciable 

 shade of cinereous; the scapular white present, but restricted in 

 extent, and interrupted by imperfect bars of dusky across the feathers. 

 Entire under parts white. Everywhere, except on chin, middle of 

 abdomen, and under tail-coverts, thickly marked with delicate waved 

 lines of dusky, most numerous across the throat, largest on the sides 

 and flanks, where some of the longer feathers are mostly dusky, finest 

 on the lower breast. The whitish on the sides of the head does not 



