2086 The Zoologist — Apkil, 1870. 



arched in the arc of a perfect circle; the tip of the upper mandible 

 acute, moderately overhanging, the basal rim broad and prominent; 

 rictus (not including the part beyond the basal rim of the upper 

 mandible) very short, only equal to the height of the upper mandible 

 at base ; gonys sinuate, at first convex in outline, then slightly 

 concave; its length but little less than the chord of the culinen.* 



Appendage of the upper eye-lid produced into a long, slender, 

 acutely pointed upright spine; that of the lower eye-lid much as in 

 other species of the genus. 



Form otherwise as in F. arctica and glacialis. Larger than the 

 former, about the size of the latter. 



Crown of the head deep grayish black ; the patch of this colour 

 triangular in shape, narrowing anteriorly to a point at the base of the 

 culmen. Sides of the head white ; the furrow in the plumage behind 

 the eye, and the sides of the lower jaw tinged with dark ash. A 

 narrow distinct line of white along the edge of the fore-arm. Entire 

 upper parts very glossy blue-black ; a duller more fuliginous shade of 

 black encircling the neck before, and running forwards on the throat 

 and chin quite to the bill. Other under parts pure white, except a few 

 elongated blackish feathers on the sides and flanks. Under surface 

 of wings dark pearly ash. Legs and feet orange-red, the webs tinged 

 with vermilion. Claws brownish black. Palpebral apjjendages 

 apparently ashy black. Rill yellow, tinged with red, the terminal 

 portion blackish. Rictal callosities brilliant yellow-orange. 



Length 1450; extent 2450; wing 7-25; tail 2-75 ; tarsus MO; 

 middle toe and claw 2'00 ; outer do. 1*90; inider do. TSS; bill — 

 chord of culmen 2*00, its curve 225 ; rictus from basal rim to tip 120 ; 

 gonys 175; depth of bill at base 180; its greatest width "OO; length 

 of nasal slit "40; length of superior palpebral appendage '35. 



This interesting species may be recognized at a glance by the 

 prominent horn over the eye, and the extension of the black collar on 

 the throat to the bill. The bill also differs from that of either of the 

 other species in its shortness, compared with its great depth at the 

 base, and the nearly smooth sides, which are not distinctly divided 

 by a ridge or groove into two compartments. The bill is also com- 

 paratively thinner than that of the other species, and diiTereutly 

 coloured. 



Prof. Naumann first described this species from Kamtschatka in his 



* The lower mandible in this specimen is so thin near the angle of the gonys us to 

 lit, transparent. Ordinary type can be re.i 1 through il. 



