BIBDS OP NORTH AND MIDDLE AMERICA. 505 



c. Smaller, with relatively smaller bill (adult male « averaging: Wing 177.7, taU 

 116.9, exposed culmen 15); coloration averaging lighter and more rufescent. 



(Panama to southern Brazil.) Antrostomus rufus rufus (p. 510). 



cc. Larger, with relatively larger bill (adult female averaging: Wing 188.5, taU 



124.2, exposed culmen 18.2) ; coloration averaging darker and less rufescent. 



(Island of Santa Lucia, Lesser Antilles.). .Antrostomus rulus otiosus (p. 513). 



66. General color grayish brown (or if rufescent the wiug less than 170 mm.); adult 



males with terminal portion of both webs of lateral rectrices white, but this 



usually occupying much less than terminal half of inner web; adult females 



with lateral rectrices abruptly tipped with buff. 



c. A distinct white, bufty, or ochraceous band across lower throat or foreneck; 



inner webs of primaries with more or less distiact spots of ochraceous-buft 



or tawny, at least on inner (proximal) quills. 



d. Lower hindneck wholly "grizzled'' brownish gray, without trace of buffy, 



ochraceous, or tawny spots, bars, or collar; larger (wing averaging 181.8 in 



male, 176 in female). (Cuba.) Antrostomus cubanensis (p. 513). 



dd. Lower hindneck- more or less spotted or barred with buff, ochraceous, or 

 tawny, or with a conspicuous collar of same; smaller (wing averaging 

 less than 180 in adult males, less than 170 in adult females). 

 e. Collar across lower hindneck more or less broken, sometimes very indistinct. 

 /. Collar across lower hindneck very indistinct, merely indicated by small 

 spots or bars of buffy or ochraceous; white tip to lateral rectrices much 

 larger on inner web than on outer,& 29 mm. or more in length; smaller 

 (wing averaging 167 or less in adult male, less than 163 in adult female) . 

 g. Spots on pileum much larger; chest vermiculated rather than spotted. 

 (Antrostomus vodferus.) ' 



h. General coloration paler; spots on inner webs of primaries more dis- 

 tinct, always (?) evident on outermost quill. 

 i. Smaller (averaging: Wing 152.4 in male-, 155.3 in female; tail 123 

 in male, 116 in female) ; sides of head usually darker, with post- 

 auricular area paler buffy and more restricted; rictal bristles 

 averaging smaller. (Eastern United States and southeastern 

 Canada, south in winter to British Honduras, Salvador, etc.) 

 Antrostomus vociferus vociferus (p. 515). 

 ii. Larger (averaging: Wingl66.3 inmale,162.1infemale; tail 124.4 

 in male, 121.3 in female); sides of head averaging more buffy 

 or ochraceous, with postocular area deeper buffy or ochraceous, 

 and larger; rictal bristles averaging decidedly larger. (South- 

 em Arizona to southwestern Texas and southward through 

 central and western Mexico.) 



Antrostomus vociferus macromystax (p. 520). 

 M. General coloration darker; spots on inner webs of primaries less dis- 

 tinct, the whole inner web of outermost quills sometimes wholly 

 uniform dusky; under parts more heavily barred and spotted. 

 (Size of.il. D.7?iacrom^sto;.) (State of Chiapas, southern Mexico; 



Guatemala.) Antrostomus vociferus chiapensis (p . 522) . 



gg . Spots on pileum much smaller ; chest spotted rather than vermiculated . 

 (Size of A . vodferus maeromystax. ) (State of Oaxaca , southwestern 

 Mexico.) Antrostomus oaxacae (p. 523). <= 



"■ No adult males of A. rufus rufus are available for measurement. 

 * Except, possibly, in A. oaxacie, of which the adult male is unknown. 

 c This form, of which only a single adult female is known, may also be a subspecies 

 oi A. vociferus. 



