792 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



Genus LUNDA Pallas. 



Lunda Pallas, Zoogr. Rosso-Asiat., ii, 1826, 363. (Type aa fixed by Gray, 1840, 



Alca drrhala Pallas.) 

 Gymnoblepharum Beandt, Bull. Sci. St. Petersb., ii, 1837, 349. (Type, Alca 



cirrhata Pallaa.) 

 Sagmatorrhina Bonaparte, Proc. Zool. Soc. Lond., 1851, 202. (Type, S. lathami 



Bonaparte=^Zca cirrhata Pallas.) 

 Sagmatorhina (emendation) Bonaparte, Ann. Sci. Nat., (4), i, 1854, 144. 

 Cheniscus (not of Eyton, 1838) Gray, List Gen. and Subgen. Birds, 1855, 127. 



(Type, Alca cirrhata Pallas.) 



Large Fraterculinfe (wing 179-206 mm.) with the deciduous nasal 

 cuirass broadest toward culmen, where surmounted by a broadly 

 romided ridge, its anterior outline concave; maxillary grooves 

 nearly vertical, concave distally; basal lamina of maxilla much 

 broader below than above; eyelids without tumid appendages, and 

 head with conspicuous, elongated and decurved postocular plumes. 



Bill very large and deep, its depth from base of culmen to gonydeal 

 angle at least equal to distance from posterior end of nostril to tip of 

 maxilla, the culmen (from frontal feathering) as long as or longer than 

 middle toe with claw (in adults) ; nasal cuirass much broader above 

 than below, its anterior outline strongly concave, surmounted on top 

 by a broad, rounded, and much thickened, slightly arched ridge, 

 in line with culmen ; basal lamina of maxilla much wider below than 

 above, minutely punctulated; sides of maxilla (in front of nasal 

 cuirass) with two to three nearly vertical grooves, slightly concave 

 distally, the sides of mandible without grooves; gonys nearly straight, 

 strongly ascending terminally, its basal angle very prominent through 

 contraction of the mandibular rami, its length equal to distance from 

 posterior end of nostril to tip of maxilla in breeding adults, much 

 less in winter adidts and young; maxOlary tomium strongly and 

 abruptly reflexed basally, nearly straight thence to the strongly 

 incised terminal portion, the tip of maxilla strongly imcinate; man- 

 dibular tomium slightly but distinctly recurved distally, the tip of 

 mandible obliquely and broadly truncate; nostril longitudinal, curved- 

 linear, the upper edge concave, the lower convex; a tumid rictal 

 rosette, conspicuous in breeding season, much less so in winter. 

 Wing moderate, the longest primaries (two outermost) exceeding 

 distal secondaries by about half the length of wing. Tail about one- 

 third as long as wing, double-rounded, the lateral rectrices much 

 shorter than middle pair. Tarsus about as long as distance from 

 posterior end of nostril to tip of maxilla, or slightly less (equal to 

 combined length of first and second phalanges of middle toe), for the 

 greater part reticulate, but the acrotarsium transversely scutellate 

 (mostly on inner side) ; 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 rather large, that of the 



