BIRDS OF NORTH AND MIDDLE AMERICA. 259 



ii. Sliglitly smaller (wing iweraging llo in male, 104 in female); 

 maxilla relatively shallower, and orange color averaging more 

 intense. (Yucatan; British Honduras ?) 



Icterus gularis yucatanensis, adult male and female (p. 287) 

 gg. Lesser wing-coverts l)lack, middle coverts white; much smaller, with 

 slender and decurved bill; sexes very different in color. {Icterus 

 cucullatus. ) 

 h. Forehead black (at least anteriorly and laterally). 

 i. Forehead with less black, the orange or orange-yellow touching 

 base of exposed culmen. 

 j. Under parts of body, hindneck, etc., decided orange. (South- 

 ern Mexico, north along eastern edge of the plateau to 

 Nuevo Leon. ) 



Icterus cucullatus cueullatus, adult male (p. 287) 

 jj. Under parts of body, hindneck, etc., orange-yellow. (South- 

 ern Texas and coast plain of Tamaulipas. ) 



Icterus cucullatus sennetti, adult male (p. 289) 

 ii. Forehead with more black, the orange or yellow not touching 

 base of exposed culmen. 

 j. Under parts of body, hindneck, etc., rich orange or orange-red; 

 larger (wing averaging 87.5 or more, tail 92 or more). 

 k. Larger, with smaller bill (wing averaging 88, tail 94.5, 

 exposed culmen 18.2). (Peninsula of Yucatan, including 

 Cam peche. ). -Icterus cucullatus igneus, adult male (p. 291) 

 kk. Smaller, with larger bill (wing averaging 87.5, tail 92, 

 exposed culmen 19). (Island of ("ozumel.) 



Icterus cucullatus cozumelae, adult male (p. 292) 

 jj. Under parts of body, hindneck, etc., chrome or saffron yel- 

 low; smaller (wing averaging 84, tail 89). (Island of 

 Mujeres, Yucatan.) 



Icterus cucullatus duplexus, adult male (p. 292) 

 /)/(. Forehead wholly yellow. (Northwestern Mexico; Lower Cali- 

 fornia; southern California; southern Arizona.) 



Icterus cucullatus nelsoni, adult male (p. 290) 

 ee. Back and scapulars not miiform black. 

 /. Forehead and at least anierior part of auricular region lUack; wing- 

 coverts without any white. 

 g. Larger (wing 86.4 to 111.8); general color, including back, orange- 

 yellow. 

 h. Crown and occiput orange-yellow. (Southern Mexico to Colom- 

 bia and Venezuela. ) 



Icterus giraudii, adult male and female ( p. 293) 



hh. Crown and occiput black, like forehead. (Gualan, Guatemala.) 



Icterus gualanensis, adult male (and female?) (p. 295) 



gg. Smaller (wing less than 8H.4); general color lemon-yellow or pale 



olive-yellow below, more olivaceous on back, etc. (Southern 



Mexico to Isthmus of Panama.) 



Icterus prosthemelas, young and immature (p. 269) 

 ff. Forehead and whole of auricular region orange, yellow or olive-green; 

 wing-coverts marked with white. 

 g. Outer webs of greater wing-coverts only partly white 



h. Middle wmg-co verts white, or much paler orange or yellow than 

 lesser coverts, concealed bases of greater coverts white 

 I. Back distinctly streaked or spotted with black; bill shorter 

 (exposed culmen not more than 23.1), general color brighter 

 yellow or orange. 



