262 BlTLLEtllSr 50, UNITED STATES NATIONAL MUSEUM. 



./. Cheeks cadmium-orange or orange-red; smaller. 



Icterus pustulatus, adult female and immature male (p. 296) 

 jj. Cheeks yellow; larger. 



k. Back conspicuously (sometimes very broadly) streaked with 

 l)lack; exposed eulmen not more than 20.3. 



Icterus sclateri, adult female and inunature male (j). 297) 



kk. Back narrow!}- and sparsely streaked (streaks sometimes 



obsolete); exposed eulmen about 24.1. 



Icterus graysonii, adult female and immature male (p. 299) 



ii. Wing-edgings pale yellowish ; middle wing-coverts dull yellowish ; 



eulmen strongly curved Icterus wagleri, immature (p. 267) 



(jg. Tail not more than 78.7. 



/(. Sides, flanks, and upper tail-coverts grayish. 



Icterus abeillei, adult female and iiumature male (p. 318) 

 hh. Sides, flanks, and iipper tail-coverts dull orange or yellowish. 

 i. Pileum without streaks or spots of black; liack paler, grayer; 

 rump pale brownish gray. 



Icterus buUockii, adult female (sometimes) and immature 

 male (p. 315) 

 a. Pileum streaked or spotted with black (sometimes uniform Ijlack ) ; 

 back darker, more olivaceous; rump fulvescent. 



Icterus galbula, adult female and immature male (p. 311) 

 bb. Throat not l)lack nor dusky. 

 c. Wing 78.7 or more. 



d. Wing more than 101.6. 

 e. Bnast yellowish, dull orange, or whitish. 

 /. Wings without white markings. 



g. Pileum and back dull saffron yellowish; bill stouter. 



Icterus giraudii, young (p. 293) 

 gg. Pileum and back olive-greenish or <lull olive. 



h. Pileum and ])ai-k olive-greenish; under j)arts canary yellow; bill 

 straighter. .Icterus melanocephalus melanocephalus, young ( ]>. 281 ) 

 /(//. Pileum and back dull brownish olive; under ])arts dull naples yel- 

 low; bill more curved Icterus wagleri, young (p. 267) 



ff. Wings with distinct whitish markings. 



g. Back dark grayish olive; middle wing-coverts dull light yellowish. 



Icterus northropi, immature male and female (jj. 266) 

 gg. Back lighter grayish olive, yellowish olive, or yellowish olive-green; 

 middle wing-coverts white or tipped with white. 

 h. Tail more than 81.3. 



i. Back more or less distinctly streaked with dusky. 

 j. Sides of head yellowish gray; throat dull sulphur yellow or light 



olive-yellow Icterus parisorum, 



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



jj. Sides of head and throat orange-yellowish or chrome yellow. 



k. Larger, with broader and conspicuous dusky streaks on back. 



Icterus sclateri, young (Addenda) 

 kk. Smaller, with nari'ower and inconspicuous streaks on black. 



Icterus pustulatus, young (p. 296) 

 n. Back without dusky streaks. 

 j. Back and scapulars grayish olive. 

 k. Breast duller (ochre) yellowish. 



Icterus cucuUatus cucullatus, adult female (j). 288) 

 kk. Breast clearer vellow. 



