94 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



gg. Orbital region without any white; back and wing-coverts decidedly 

 browner than rest of upper parts. 

 h. Back, scapulars, and wing-coverts tawny-brown or russet; In-east, 

 sides, and flanks tawny-ochraceous, not distinctly, if at all, 

 different from color of under wing-coverts. (Mexico.) 



Planesticus flavirostris (p. 105) 



hh. Back, scapulars, and wing-coverts light wood brown or Isabella 



color; breast pale broccoli brown or buff -gray, deepening into 



dull cinnamon on sides and flanks, both very different from the 



tawny-ochraceous of under wing-coverts. (Tres Marias Islands, 



western Mexico.) Planesticus graysoni (p. 106) 



ff. A white patch on lower throat. 



g. Head chestnut-brown or vandyke brown, in strong contrast with oliva- 

 ceous slate color of back. (Jamaica.) . Planesticus jamaicensis (p. 107) 

 gg. Head buffy brown, olive, or dull slate color, concolor with back. 

 {Planesticus tristis.) 

 h. Upper parts distinctly brown or olive. 

 i. Paler and browner. 

 j. Larger (wing averaging 127.5 in male, 124.4 in female); upper 

 parts light olive or buffy olive-brown. (Western and south- 

 western portions of Mexican plateau.) 



Planesticus tristis tristis (p. 108) 



jj. Smaller (wing averaging 123.4 in male, 120.9 in female); upper 



parts deeper buffy olive or olive-brown. (Southeastern slope 



of Mexican plateau.) Planesticus tristis assimilis (p. 109) 



ii. Darker and more olivaceous. (Humid Pacific slope, from eastern 



Oaxaca to Chiriqui.) Planesticus tristis cnephosa (p. llOj 



hh. Upper parts dull slate color or dusky gray. (Central highlands, 

 from northern Guatemala to Costa Rica~.) 



Planesticus tristis leucauchen (p. Ill) 



ee. Throat pale brown, or with only upper portion white, streaked with brown 



or grayish brown. 



/. Orbital region more or less naked ; upper parts grayish olive or light olive ; 



ground color of chin and upper throat whitish; bill yellowish. (Islands 



of Grenada and St. Vincent, Lesser Antilles, and adjacent mainland.) 



Planesticus gymnophthalmus (p. 113) 



ff. Orbital region feathered; upper parts deep brown; ground color of chin 



and throat pale brown; bill blackish. (Costa Rica and Panama.) 



Planesticus obsoletus (p. 114) 

 cc. Under tail-coverts brown medially, with darker shaft -streak, whitish laterally 

 (in part). (Islands of St. Vincent and Grenada, Lesser Antilles.) 



Planesticus nigrirostris (p. 115) 

 bb. Under tail-coverts without any white. 

 c. General color bviffy brown or buffy olive (paler below), the under wing-coverts 

 strongly buff, ochraceous-buff, or tawny-ochraceous. 

 d. Inner webs of remiges distinctly edged with buff or ochraceous-buff; under 

 tail-coverts (exposed portion) clear buff (more or less deep). {Planesticus 

 grayi.) 

 e. Larger (wing averaging more than 120 mm.); coloration more buffy brown, 

 or else upper parts grayer. 

 /. Under parts paler, more buffy, less uniform; upper parts more buffy 

 brown or buffy olive. 



