PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 657 



collector) : Grouuil color of the head, neck, and lower i)arts pure white, 

 but this imvaried only on the sides of the forehead, lores, malar region, 

 cbiu, throat, jugulnm, andcrissum; feathers of middle portion of fore- 

 head (longitudinally) and forepart of crown marked with a central spot 

 of slate-color, these spots mostly approaching a lozenge-shaped form, but 

 becoming gradually more transverse posteriorly, and at the same time 

 paler in color; the terminal margin of the feathers grayish white; a 

 distinct blackish spot immediately before and beneath the eye ; sides 

 of the breast washed with grayish ; belly and flanks overlaid by a nearly 

 uniform wash of smoky plumbeous, but the white showing through in 

 places; many feathers of the sides barred with plumbeous-gray ; anterior 

 uuder wing-coverts dark sooty-gray or slate-color, those along the outer 

 margin mainly of the same color; rest of under surface of the wing, 

 including inner webs of primaries, uniform pure white, the latter having 

 merely a narrow, but very abruptly defined, dusky stripe next the 

 shaft, the white being margined for a short distance along the terminal 

 portion with grayish ; axillars mainly plumbeous, or barred with the 

 same. ]:^ape, back, scapulars, rump, upper tail-coverts, and middle tail- 

 feathers, bluish plumbeous, darkest on the lower part of the rump, the 

 feathers with distinct dusky shaft-streaks, except on the nape. Tail 

 (except middle feathers) white, with very irregular transverse bars or 

 \'ermiculations of plumbeous-gray. Lesser wing-coverts dark slate- 

 color (many shades darker than the back); greater coverts, secondaries, 

 and tertials i)lumbeous-gTay (more silvery toward edge of wing), very 

 distinctly edged with pure white; three outer primaries and primary 

 coverts slate-black, the inner quills gradually moie grayish, and nar- 

 rowly bordered with white ; bill uniform deep black ; tarsi, most of 

 basal phalanx of inner toe, and basal portion of webs, light brownish 

 (apparently flesh-coloi-ed or lilaceous in life) ; rest of the feet dusky. 



Wing, 10.15; tail, 4, slightly graduated; culmen, 1; depth of bill at 

 base, .40 ; tarsus, 1.35 ; middle toe, 1.40. 



This elegant Petrel, probably the handsomest of the genus, belongs 

 to the delicately-formed, slender-billed group which includes Q?. coolH 

 (Gray), (E. gavia (Forst.), (E. desolata (Gm.), and ffi. defiUipiana (Gigl. & 

 Salvad.). It is apparently most nearly allied to the last named, from 

 which, however, it may be distinguished by the following characters: 

 (E. Jisheri. Lower parts chiefly smoky x>lumbeous on the surface, this 

 color nearly uniform on the bellj^ and flanks ; greater wing-coverts, 

 secondaries, and tertials silvery plumbeous, broadly edged with pure 

 white, and in very conspicious contrast with the blackish slate lesser- 

 covert, area; rectrices (except middle pair) white, transversely ver- 

 miculated with grayish. Wing, 10.15 ; tail, 4 ; culmen, 1 ; tarsus, 1.35 ; 

 middle toe, with claw, 1.70. Hab. — Eastern North Pacific (off coast 

 of Alaska) ; accidental in Western Xew York % 

 CE. dejillijnana. Lower parts pure white, tinged laterally with cinereous ; 

 greater wing-coverts, secondaries, and tertials dusky, edged terminally 

 Proc. Nat. Mus. 82 42 June 26, 1 883. 



