258 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



n. Upper rump black; flanks black; lower abdomen yel- 

 low; upper tail-coverts mostly black. (Island of 

 Porto Rico, Greater Antilles. 



Icterus portorioensis, adiilt male and female (p. 272) 

 nn. Whole rump yellow; flanks yellow; lower abdomen 

 black (the feathers sometimes tipped with yellow); 

 upper tail-coverts yellow. ( Island of Haiti, Greater 

 Antilles. ) 

 Icterus dominioensis, adult male and female (p. 273) 

 U. Rump, lesser and middle wing-coverts, thighs, lower abdo- 

 men, and under tail-coverts orange or orange-yellow. 

 (Santa Lucia, Lesser Antilles.) 



Icterus laudabilis, adult male and female (p. 274) 

 ff. Under parts of body and rump chestnut, ferruginous, or rufous-tawny. 

 g. Head and neck black; under parts of body, rump, and smaller wing- 

 coverts chestnut. (Eastern United States; south in winter to Isth- 

 mus of Panama.) Icterus spurius, adult male (p. 275) 



gg. Head, neck, and chest dark chestnut; under parts of body, rump, 

 and smaller wing-coverts ferruginous or rufous-tawny. (Island 

 of Martinique, Lesser Antilles. ) 



Icterus bonana, adults and young (p. 279) 

 ee. Back and scapulars yellowish olive-green or olive-yellow. 

 /. Larger (tarsus more than 25.4); bill stouter, with culmen straight. 

 {Icterus melanocephalus. ) 

 g. Smaller (wing averaging 96.5 in male, 91.9 in female); wings without 

 distinct, if any, white edgings. (Southern Mexico.) 

 Icterus melanoceplialus melanocephalus, adult male and female (p. 280) 

 gg. Larger (wing averaging 100.6 in male, 96 in female); wings with 

 distinct white edgings. (Northeastern Mexico; southern Texas.) 

 Icterus melauocephalus audubonii, adult male and female (p. 282) 

 ff. Smaller (tarsus less than 25.4); bill more slender, with culmen dis- 

 tinctly curved terminally. (Southern Mexico to Isthmus of Panama. ) 

 Icterus prosthemelas, immature (p. 269) 

 dd. Head orange, yellow, or olive-green, with black throat and capistrum. 

 e. Back and scapulars uniform black. 

 /. Breast spotted with black (at least laterally) . {Icterus pectoralis.) 

 g. Larger (wing averaging 102.1). (Southern Mexico to Salvador.) 



Icterus pectoralis pectoralis, adult male and female (p. 283) 

 gg. Smaller ( wing averaging 97. 5 ) . (Western Nicaragua and Costa Rica. ) 

 Icterus pectoralis espinachi, adult male and female (p. 284} 

 ff. Breast not spotted. 



g. Lesser and middle wing-coverts orange or yellow; much larger, with 

 very stout bill and straight culmen; sexes aUke in color. {Icterus- 

 gularis. ) 

 h. Larger (wing averaging 125 in male, 113.8 in female); under 

 parts of body, etc., more yellowish orange or orange-yellow. 

 (State of Oaxaca, southern Mexico, to Honduras and Salvador.) 

 Icterus gularis gularis, adult male and female (p. 284) 

 hh. Smaller (wing averaging not more than 114.8 in male, 108.2 in 

 female); under parts of body, etc., more intense orange. 

 i. Slightly larger (wing averaging 114.3 in male, 108.2 in female; 

 maxilla relatively deeper, and the orange color averaging leaa 

 intense. (States of Vera Cruz, Puebla, San Luis Potosi, and 

 Tamaulipas, eastern Mexico. ) 



loterus gularis tamaulipensis, adult male and female (p. 286) 



