12 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



ff. Suborbital and subauricular regions and sides of neck and chest more 

 or less tinged with, pale gray (at least in part) . 

 g. Smaller, especially the bill (wing averaging less than 134 in male, less 

 than 135 in female; exposed culmen averaging less than 28 mm.). 

 h. Under parts much paler, strongly buffy only posteriorly. (Bahamas, 

 Florida Keys, and Gulf Coast of southern Florida; occasional in 

 Cuba and Haiti; Grand Cayman?). 



Coceyzus minor maynardi (p. 25). 



hh. Underparts much more deeply colored, distinctlybuffy throughout. 



(Cuba?; Haiti; Jamaica; Porto Rico and adjacent islands; St. 



Thomas; St. Johns; Virgin Gorda; Tortola; St. Croix; Grand 



Cayman?; Abaco I., Bahamas; Florida Keys and Gulf coast of 



southern Florida?) Coceyzus minor nesiotes (p. 26). 



gg. Larger (wing averaging more — usually much more— than 134, exposed 

 culmen averaging 29 or more) . 

 h. Color of under parts much deeper than in C. nesiotes. (Dominica; 



Martinique; Guadeloupe.) Coceyzus minor dommicse (p. 31.) 



hh. Color of under parts not deeper (sometimes paler) than in C. 

 nesiotes. 

 i. Averaging not paler than in C. m. nesiotes. 

 j. Smaller (wing averaging 134.7 in male, 140.7 in female; exposed 

 culmen 29.1 in male, 28.7 in female). (Antigua; Barbuda; 



Swan Island.) Coceyzus minor rileyi (p. 29).) 



jj. Larger (wing averaging 146.2 in male, 143.3 in female; exposed 



culmen averaging 30.8 in male, 30.1 in female). (St. 



Vincent; Santa Lucia.). ..Coceyzus minor vincentis (p. 30.) 



ii. Averaging paler than C. m. nesiotes. 



j. Slightly paler; bill larger (exposed culmen averaging 30.9 in 



male, 30.4 in female). (Grenada and Grenadines.) 



Coceyzus minor grenadensis (p. 33). 

 jj. Decidedly paler; bill smaller (exposed culmen averaging 29 in 

 male, 29.1 in female). (Islands of St. Andrews and Old 

 Providence, Caribbean Sea; Aruba?) 



Coceyzus minor abbotti (p. 34.) 

 ee. Wings extensively rufescent. (Cocos Island, off Panama.) 



Coceyzus ferrugineus (p. 34). 

 dd. Mandible black, like maxilla. (Colombia to Peru, Guiana, Argentina, etc.; 



Galapagos Islands.) Coceyzus melaeoryphus (p. 35). 



bb. Lateral rectrices brownish gray narrowly tipped with dull white and (in adults) 

 with a subterminal spot or bar of dusky. (Eastern North America, south in 

 winter to West Indies and through Mexico and Central America to Amazon 



Valley.) Coceyzus erythropthalmus (p. 38). 



aa. Hindneck, back, and scapulars rusty brown, in conspicuous contrast with gray of 

 head; under parts ochraceous-tawny. (Panama to Venezuela and Ecuador.) 



Coceyzus lansbergi (p. 41). 



COCCYZUS AMERICANUS AMERICANUS (Linnseus). 



YELLOW-BILLED CUCKOO. 



Adults (sexes alike). — Above plain grayish brown (nearest hair 

 brown), faintly glossed with bronzy, usually becoming more grayish 

 (sometimes distinctly gray) on forehead, the outer webs of primaries 

 (especially the proximal ones) usually more or less suffused with 

 rufescent brown-, sometimes nearly uniform dull cinnamon-rufous; 

 middle pair of rectrices usually becoming more dusky (sometimes 



