BIRDS OF NORTH AND MIDDLE AMERICA. 763 



bb. Adult males never with throat or superciliary streak ochraceous-buff or tawny 

 (rarely with a patch or tinge of ochraceous or huffy on throat). 

 c. Under parts darker, more olivaceous; upper parts browner or more olive; bill 

 longer (distance from nostril to tip of maxilla 7.9-8.9). 

 d. Chin and under wing-coverts buffy; mandible usually black. (Tower 



Island.) : Certtiidea mentalis (p. 766) 



dd. Chin and under wing-coverts not buffy (white or pale yellowish); 

 mandible never (?) black. 

 f. Paler, especially on sides and flanks; throat never inclining to ochraceous; 

 smaller (wing not more than 53.8). (Abingdon and Bindloe islands.) 



Certhidea fusca (p. 766) 



ee. Darker, especially on sides and flanks; throat sometimes tinged with 



or inclining to ochraceous; larger (wing 55.9-62 in males, 51.8-56.9 in 



females) . 



/. Smaller (wing of male 55.9-58.9, of female 51.8-53.*); pileum and sides 



of breast paler. (Wenman Island. ) Certhidea beoki (p. 767) 



ff. Larger (wing of male 62, of female 56.9); pileum and sides of breast 



darker. ( Culpepper Island ) Certhidea drownei ( p. 767) 



cc. Under parts brownish white; upper parts grayer; bill shorter (never more 

 than 8.4 from nostril to tip of maxilla, usually much less); rectrices nar- 

 rowly tipped with whitish. (Hood Island and Gardner Island near Hood. ) 



Certhidea cinerascens (p. 768) 

 00. Wing with two narrow bars of whitish. (Barrington Island.) 



Certhidea bifasciata (p. 768) 



CERTHIDEA OLXVACEA Gould. 

 DARWIN'S CERTHIDEA. 



Adult male. — Above plain pale olive, hecoming more olive-gi'ay on 

 pileum and hindneck; rump and upper tail-coverts more liuff yolive; 

 wings and tail dusky grayish with pale olive edgings, the middle wing- 

 coverts broadly tipped with wood brown, the greater coverts broadly 

 edged with the same; a short superciliary stripe (extending from nos- 

 tril to about 4 mm. behind eye), lower eyelid, malar region, chin, 

 and throat (sometimes upper chest also) cinnamon-tawn}-, tawnj'- 

 ochraceous, or cinnamon-rufous; lores and suborbital region pale dull 

 bufl'y; auricular region light buffy grayish; median portion of breast 

 and abdomen and under tail-coverts ci'eam buff, the breast with more 

 or less concealed central spots of the color of throat, the shorter 

 under tail-coverts tinged with the same; sides and flanks grayish buff}' 

 or pale olive-brown ; maxilla dusky, mandible pale brownish or brownish 

 white (in dried skins); iris dark brown; tarsi horn brown, the toes 

 darker; length (skins), about 91.5; wing, .55-57; tail, 37-40; bill from 

 nostril, 7.' 



Adult female. — Similar to the. adult male but .slightlj' smaller; under 

 parts paler (more whitish), with less of the cinnamon-tawny or cinna- 

 mon-rufous color on throat, etc., usually with much less, sometimes 

 with none; wing 54-56 (rarely exceeding 55).^ 



' Measurements from Rothschild and Hartert. 

 ^According to Rothschild an<l Hartert. 



