610 M.CM. 



Ui'ia occidentalis, Aud. B. Amer. vii. p. 264, pi. cccclxxi. (1844). 

 Cerorhina occidentalis, G. R. Gray, Gen. B. iii. p. 639 (1848). 

 Chimerina monocerata, Eeichenb. Natatores, pi. vi. figs. 2706-7 



(1850). 

 Ceratorhyncha monocerata, Cassin, in Perry Eaped. Jap. ii. p. 233 



(1857) ; id. U.S. E.ipl. Eaped. p. 349 (1858) ; Whitely, Ibis, 1867, 



p. 209 [Hakodadi] ; Coues, P. Ac. Pliilad. 1868, p. 28 ; Swinhoe, 



Ibis, 1874, p. 166 [Hakodadi] ; Blakist. ^ Pryer, Ibis, 1878, p. 211 



[Yezo] ; iid. Tr. As. Soc. Jap. x. p. 92 (1882). 

 Cerorhina monocerata, Cassin, in Baird's B. N. Amer. p. 905 (1858) ; 



Cooper Sf Suckl. N. R. Wash. Terr. p. 284 (lb60) ; Ball 8f Bann. 



Tr. Chicago Acad. i. p. 309 (1869) [Sitka] ; G. B. Gray, Rand-l. 



B. iii. p. 97 (1871); Tacz. J.f. O. 1876, p. 203 [Ussuri] ; Bolau, 



J.f. O. 1882, p. 341 [\ladivostok] ; Nelsm, Rep. N. H. Alaska, 



p. 40 (1887). 

 Cerorhina suckleyi, Cassin, in Baird's B. N. Amer. p. 906 (1858) ; 



Cooper ^ Sttcki. N. U. Wash. Terr, p. 284 (1860). 

 Simorhynchus monoceratua, Schl. Mus. Fays-Bas, vi. Urinat. p. 26 



(1867). 

 Sagmaton-hina suckleyi, Coves, P. Ac. PhUad. 1868, p. 32. 

 Ceratorhina monocerata, Brandt, Melang. Biol. vii. p. 239 (1869); 



Cones, Key N. Amer. B. p. 341 (1872) ; id. Key N. Amer. B. 



2nd ed. p. 805 (1884) ; Henshaio, Auk, ii. p. 387 (1885) ; Tacs. 



Mem. Acad. St. Petersb. xxxix. p. 1241 (1893) [E. Siberia]. 

 Cerorhyna monocerata, Tacz. Bull. Soc. Z. Fr. ii. p. 52 (1877). 

 Fratercula monocerata, Barro2vs, P. Bost. Soc. xix. p. 154 (1877) ; 



Seelohm, B. Japan, p. 283 (1890) ; id. Ibis, 1892, p. 96 [Tsu- 

 shima]. 

 Cerorh^ncba monocerata, Baird, Breiv. ^- Ridgw. Water-B. N. 



Amer. ii. p. 520 (1884) ; Ridgic. Man. N. Amer. B. p. 12 (1887). 

 Cerorhincha monocerata, Bvermann, Auk, iii. p. 88 (1886) [Ven- 

 tura, California]. 

 Cerorhinca monocerata, A. O. U. Check-l. p 78 (1886) ; Stejn. P. 



U.S.Nat. Mus. X. p. 118 (1887) [Commander Is.]; Loomis,P. 



Calif. Acad. (2) vi. p. 16 (1896) [California] ; Grinnell, Auk, xv, 



p. 124 (1898) [Sitka]. 



Adult in breeding-phimage. General colour above dark brownish- 

 black ; sides of the head, chin, throat, fore-neck, and chest, as well 

 as the sides, flanks, and under wing-coverts, smoky-grey ; breast and 

 rest of the underpaits white, generally more or less clouded with 

 smoky-grey ; a band of elongate narrow white feathers commencing 

 above and behind the eye, and extending along the sides of the 

 occiput ; a similar band of somewhat longer feathers commencing 

 at the angle of the gape passes across the cheek ; quills and tail- 

 feathers brownish-black, the former paler on the inner web. Tail 

 composed of 16 (in one specimen of 18) feathers. " Iris pale 

 amber ; bill orange-yellow, cutting-edges of both upper and lower 

 mandibles dusky ; ridge of culmen and anterior and posterior edges 

 of horn black ; corner of mouth white ; feet whitish-yellow, with 

 slight dusky laarkings at the joints ; back of metatarsi and soles of 

 feet blackish " (P. A. Hoist). 



Adult male. Total length about 14 inches, horn at base of culmen 

 0'48, culmen from feathers on forehead to tip 1 4-l'45, from gape 



