778 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



[Simorhynchus] tetraculus Gray, Hand-list, iii, 1S71, 97, no. 10782. — Coues, Key 



N. Am. Birds, 1872, 342. 

 ^Zca cmtata MtJLLER, Natursj-st., Suppl.. 1776, 104. 



Simorhynchus cristatus Merrem, in Ersch u. Gruber's Encycl., ii, 1819, 400. 

 Una dubia Pallas, Zoogr. Eosso-Asiat., ii, 1826, 371, pi. 87 (=young). 

 Phaleris dubia Brandt, Bull. Ac. St. Petersb., ii, 1837, 347. 

 F[haleris] dubia Gray, Gen. Birds, iii, 1848, 638. 



Alca dubia IvixTLrrz, Denkw. Reise, i, 1858, 300 (St. Paul Island, Pribilof group). 

 Symorhynchus dubius Coues, Proc. Ac. Nat. Sci. Phila., 1868, 40 (monogr.). 

 Phaleris superciliosa (not Mormon superciliosa Liclitenstein) Bonaparte, Geog. 



and Comp. List, 1838, 66. 

 Phalei-is supercillata Audubon, Birds Amer., folio ed., 1838, pi. 402, fig. 

 Phaleris mystncea (not Uria mystacea Pallas) Blakiston and PRYER,.Ibis, 1878, 



210, part (Kuril Islands; Shiinoda and Tokyo Bay, Japan). — Seebohm, 



Ibis, 1879, 21. 



Genus CERORHINCA Bonaparte. 



Cerorhinca Bonaparte, Ann. Lye. Nat. Hist. N. Y., ii, 1828, 427. (Type C. 



occidentalis Bonaparte=-4Zca monocerata Pallas.) 

 Ceratorrhina (emendation) Bonaparte, Oss. Regne Anini., 1830, 134; Saggio, 



1831, 62. 

 Ceralorhina (emendation) Audubon, Orn. Biog., v, 1839, 104. 

 Cerorhina (emendation) Brandt, Bull. Sci. St. Petersb., ii, 1837, 348. 

 Ceratorhynchvs (emendation) Sundevall, Orn. Syst., 1836, 130. 

 Ceratorhyncha Bonaparte, Geog. and Comp. List, 1838, 66. 



Chiinerma Eschscholtz, Zool. Atlas, iii, 1829, 2, pi. 12. (Tpye, C cornuta 

 Escbscholtz=^4 /ca monocerat.a Pallas.) 



Large Phalerinse (wing 169-183 mm.) with relatively long bill 

 (the distance from nostril to tip of maxilla nearly if not quite equal 

 to length of tarsus), with 16-18 rectrices, and adults in breedmg 

 season with a conspicuous vertical compressed knob at base of culmen. 



Bill, from rictus, nearly as long as head, much compressed, its 

 width^at anterior end of nostrils only about half its depth at same 

 point and equal to not more than one-third the distance from nostril 

 to tip of maxilla; culmen, from anterior edge of supra-nasal horn 

 or saddle, decidedly shorter than tarsus, but more than half as long 

 as commissiu-c, strongly and regularly curved; gonys shorter than 

 distance from nostril to tip of maxilla, faintly concave, its basal 

 angle very prominent; maxUlary tomium faintly convex sub-basally, 

 decidedly concave distally, distinctly notched near uncinate tip of 

 maxilla; mandibular tomium slightly but distinctly convex distally, 

 distinctly notched near tip of mandible; nostril longitudinal, slit-like 

 in extreme lower edge of nasal fossa, or in breeding season beneath 

 lower edge of the corneous nasal cuirass; frontal antia about on line 

 (vertically) with posterior end of nostril, the mental antia about on 

 line with middle of nostril, the indistinct malar antia (at lower edge 

 of ramus) about on line with frontal antia, or slightly posterior to it. 



