BIRDS OF NORTH AND MIDDLE AMERICA. 261 



c. Head entirely black; lateral rectrices orange or yellow with black sub- 

 basal space; outer webs of greater wing-coverts black basally. (Eastern 

 North America, south in winter to Colombia) 



Icterus galbula, adult male (p. 310) 



ee. Head partly yellow or orange; lateral rectrices orange or yellow with 



black or dusky terminal space; outer webs of greater wing-coverts 



wholly white. 



/. Auricular region, rump, sides, and flanks orange or yellow. (Western 



United States, south in winter over Mexican plateau. ) 



Icterus buUockii, adult male (p. 314) 

 ff. Auricular region, rump, sides, and flanks black. (Southern portion of 



Mexican plateau.) Icterus abeillei, adult male (p. 818) 



aa. Tail neither entirely black nor distinctly bicolored (mostly plain olivaceous or 

 dusky). 

 b. Throat black or dusky, 

 c. Larger (wing more than 78.7). 

 d. Wing 101.6 or more. 

 e. Pileum dull orange; greater wing-coverts narrowly edged with white ter- 

 minally Icterus gularis and subspecies, immature (p. 284) 



ee. Pileum olive-green; greater wing-coverts broadly edged with white for 

 terminal half or more. (Jamaica. ) .Icterus leucopteryx, young (p. 304) 

 dd. Wing less than 101.6. 

 e. Under parts mostly orange or yellow. 

 /. Back without any black. 



g. Pileum black or partly black. 

 h. Back and rump olive-green; rectrices edged with olive-green; pale 

 margins to greater wing-coverts and remiges narrower. 



Icterus melanocephalus melauoceplialus, immature (p. 281) 

 hh. Back and rump grayish (tinged with olive-green); rectrices edged 

 with grayish; pale margins to greater wing-coverts and remiges 

 broader ...Icterus melanoceplialus audubonii, immature (p. 282) 

 gg. Pileum yellowish, olive-greenish, or orange. 

 h. Scapulars yellowish olive-green. 

 i. Deeper olive-green above, brighter yellow below. 



Icterus xantbornus xantboruus, immature (p. 301) 

 a. Paler, both above and below. 



Icterus xantbornus curasoensis, immature (p. 303) 

 hh. Scapulars grayish or dusky. 

 i. Pileum orange; back dull orange, tinged with olive-green. 



Icterus auratus, immature (Addenda) 

 ii. Pileum olive-greenish; back dusky grayish or grayish ohve- 

 green. 

 j. Pileum lighter, more yellowish, ohve-green; under parts more 

 saffron yellow; tail longer (about 88.9). 



Icterus cucuUatus and subspecies, immature male (p. 288) 



jj. Pileum darker oUve-green; under parts more olive-yellow; tail 



shorter (about 67.3) .Icterus spurins, immature male (p. 275) 



ff. Back with more or less of black. 



g. Tail more than 78.7. 



h. Pileum streaked with black or dusky; sides of head and neck 



grayish Icterus parisorum, 



immature male and (sometimes) adult female (p. 309) 

 hh. Pileum not streaked; sides of head and neck yellow or orange. 

 i. Wing-edgings white and grayish; middle wing-coverts white, or 

 mostly so; culmen very slightly curved. 



