BIRDS OF NORTH AND MIDDLE AMERICA. 779 



Wing moderate, the longest primaries (two outermost) exceeding 

 distal secondaries by slightly more than half the length of wing. 

 Tail less than one-third (but more than three-sevenths) as long as 

 wing, sUghtly but distinctly rounded; rec trices 16-18. Tarsus 

 much shorter than middle toe without claw, reticulate for greater 

 part but with obliquely transverse scutella on lower half of acrotar- 

 sium ; outer toe (without claw) as long as middle toe (without claw) 

 or very slightly shorter, the inner toe as long as first two phalanges 

 of middle toe; claws moderate or rather small, slightly curved, 

 rather blunt. 



Nuptial ornaments. — A prominent compressed obtusely conical 

 knob or horn at base of culraon, surmounting the corneous nasal 

 cuirass, of which it is part. 



Plumage and coloration.— Adults with two series of elongated 

 narrowly lanceolate white plumes, one orginating at posterior angle 

 of eye and extending backward to side of nape, the other starting 

 at rictus and extending back beneath suborbital and auricular 

 regions to or beyond posterior end of the latter. Upper parts sooty 

 blackish fading into brownish gray on chin, throat, foreneck, chest, 

 sides and flanks, the remaining under parts white. 



Range. — Coasts and islands of northern Pacific Ocean, from 

 California to northern Japan. (Monotypic.) 



CERORHINCA MONOCERATA (Pallas). 



RHINOCEROS ATTKLET. 



Adults in breeding season (sexes alike).— Upper parts sooty black- 

 ish, the scapulars, interscapulars, and feathers of rump indistinctly 

 tipped with dark sooty grayish; sides of head deep hair brown (or 

 between hair brown and fuscous), passing gradually into lighter hair 

 brown or mouse gray on malar region; chin, throat, chest, sides, and 

 flanks white, more or less clouded with brownish gray, especially on 

 l)reast, the posterior under tail-coverts brownish gray; axiilars and 

 under wing-coverts uniform brownish gray, like sides and flanks; a 

 line of straight, elongated, lanceolate white feathers originating at 

 posterior angle of eye and extending backward along sides of occiput 

 to nape, and another broader series starting at rictus and extending 

 backward beneath suborbital and auricular regions to or beyond 

 posterior end of the latter; bill orange-yellow or dull orange (in life) 

 with culmen and both anterior and posterior edges of the hornlike 

 supra-nasal appendage black; u-is brown" or pale amber; ^ legs and 

 feet whitish yellow (in life), darker on joints of toes, the planta tarsi 

 and soles blackish.'' 



oW. A. Cooper, manuscript. ^P. A. Hoist, according to Grant. 



