ALCID^E. 9 



a*. Inner claw not obviously different in size or shape from the others ; corner of 



mouth without thickened naked skin or " rosette." 

 b l . Angle of chin much nearer to nostril than to tip of bill. 



c 1 . Nostrils exposed, overhung by a more or less distinct horny scale, and 

 feathers of lores never reaching to anterior end of nostrils; second- 

 aries without white tips. (Subfamily Phalerince.*) 

 d l . Gonys occupying more than half the total length of the lower 

 mandible, or else tip of upper mandible not abruptly decurved 

 from a long, straight culmen. 



e l . Distance from anterior border of nasal hollow to nearest loral 

 feathers equal to one half or more than one half the dis- 

 tance from the same point to the tip of the bill. (Phalerece.} 

 f 1 . Bill about as long as the head (culmen about 1.00) ; wing 



more than 6.50 Cerorhinca. (Page 11.) 



/ 2 . Bill much shorter than head (culmen less than .75) ; wing 



less than 6.50. 



g l . Upper mandible broader than deep at base ; culmen 

 nearly straight. ("Wing about 5.00.) 



Ptychoramphus. (Page 12.) 

 g*. Upper mandible higher than broad at base ; culmen 



decidedly curved. 



h l . Lower mandible very narrow, strongly and very 

 regularly recurved, the tip acute ; edge of 

 upper mandible very regularly convex. (Wing 



5.25-6.00.) Cyclorrhynchus. (Page 12.) 



h*. Lower mandible more than half as deep as the 

 upper, not recurved, or else tip not acute ; 

 upper mandible with edge nearly straight or 

 else not regularly convex. (Wing 5.25 or 



less.) Simorhynchus. (Page 12.) 



e 2 . Distance from anterior border of nasal hollow to nearest loral 



feathers equal to not more than one-fourth the distance 



from the same point to the tip of the bill. (BracTiyramphece.} 



f 1 . Tarsi scutellate in. front, much longer than the horny 



portion of the commissure. 



Synthliboramphus. (Page 13.) 

 / 3 . Tarsi reticulate in front, not longer than horny portion of 



commissure Brachyramphus. (Page 14.) 



d 2 . Gonys occupying less than half the total length of the lower man- 

 dible ; culmen straight to near the tip, where abruptly decurved. 

 (Cepphece.') 



Loral feathers forming an acute angle. (Wing 6.50-7.50 ; 



culmen 1.00 or more.) Cepphus. (Page 16.) 



c 2 . Nostrils completely concealed or enclosed within a dense, velvety 

 feathering, which extends from the lores to or beyond their an- 



2 



