BIRDS OF NOETH AND MIDDLE AMEEIOA. 179 



i. Smaller (adult male averaging less than wing 61, tail 49); young 

 dull olive-whitish beneath. 



j. Paler (California. ) Vireo huttoni Imttoni (p. 195) 



jj. Darker (Coast district of Oregon and Washington to Vancou- 

 ver Island. ) Vireo huttoni obsourus (p. 196) 



ii. Larger (adult male averaging wing 67.3, tail 51.9; adult female, 

 wing 65.4, tail 51.2); young strongly huffy beneath. (South- 

 em portion of Mexican plateau to Guatemala. ) 



Vireo huttoni mexioanus (p. 196) 

 hh. Paler, with upper parts olive-gray and under parts less strongly 

 washed with olive or without olive tinge. 

 i. Under parts tinged with yellowish, the chest faintly shaded with 

 olive-buff; rump and upper tail-coverts more decidedly olive- 

 green; adult male averaging wing 68.8, tarsus 18.4; adult 

 female, wing 67.7, tarsus 18.5. (Southern Arizona and north- 

 ern Mexico. ) Vireo huttoni stephensi (p. 197) 



ii. Under parts without yellowish tinge, the chest not shaded with 

 olive-buff; rump and upper tail-coverts less strongly olive- 

 green; adult male averaging wing 64.8, tarsus 19.1; adult 

 female, wing 62.9, tarsus 19. (Cape district of Lower Califor- 

 nia. ) Vireo huttoni oognatus (p. 199) 



ee. Supraloral stripe continued over eye to decidedly beyond posterior angle 



of the latter. (Costa Kica. ) Vireo carmioli (p. 199) 



cc. Lores not distinctly different in color from forehead. (Jamaica. ) 



Vireo modestus (p. 200) 



aa. Middle and greater wing-coverts not abruptly or sharply tipped with yellow or 



whitish. 



6. Under parts and superciliary stripe deep yellow, upper parts bright olive-green. 



( Vireo hypochryseus. ) 



c. Smaller and brighter colored, the under parts bright lemon yellow; adult 



male averaging wing 64.5, tail 56, exposed culmen 12.5, tarsus 18.3; adult 



female, wing 61.6, tail 55, exposed culmen 12, tarsus 18.1. (Western 



Mexico.) Vireo hypochryseus hypochryseus (p. 201) 



cc. Large and duller colored, the under parts olive-yellow; adult male averaging 

 wing 66.6, tail 59.7, exposed culmen 13.4, tarsus 20.2; adult female, wing 

 64.7, tail 59.2, exposed culmen 13.3, tarsus 20. (Tres Marias Islands, west- 

 ern Mexico. ) Vireo hypochryseus sordidus (p. 202) 



66. Under parts and superciliary stripe (if present) not yellow; upper parts not 

 olive-green. 

 c. Larger (wing 61-67, tail 55-61) ; upper parts clear gray; lores entirely whitish. 

 (Southern California to western Texas and south into northern Mexico.) 



Vireo vicinior (p. 202) 

 cc. Smaller (wing not more than 59, tail less than 55); upper parts not clear 

 gray and lores not entirely whitish. 

 d. Back olive-gray, grayish olive, or dull olive-green, the pileum not essen- 

 tially different in color. 

 e. Smaller (wing 53, tail 43, tarsus 17); bill black. (Southwestern Mexico. ) 



Vireo nanus « (p. 204) 

 ee. Larger (wing 52-59, tail, 41.5-54, tarsus 19-20); bill brown, with paler 

 mandible. ( Vireo hellii. ) 



«The single known specimen of this very distinct species is in much abraded 

 plumage, and consequently I am not sure as to the character of the wing-markinga. 

 Possibly it should go under section "a." 



