BIRDS OF NORTH AND MIDDLE AMERICA. 763 



hb. Adult males never with throat or puperciliary streak ochraceons-])iiff or tawny 

 (rarely with a patcli or tinge of ochraceous or huffy on throat), 

 c. Under parts darker, more olivaceous; upper parts hrowneror moi'e olive; l)ill 

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

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



Island. ) Certhidea mentalis ( p. 7fi6 ) 



dd. Chin and under wing-coverts not l)uffy (white or ])ale yellowish); 

 mandible never (?) black. 

 e. 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 51.8-53.8); jiiJeum and sides 



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



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



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



cc. Under parts ]:)rownish white; upper parts grayer; bill shorter (never more 

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

 rowly tipped with whitish. (Hood Island and (Tardner Island :;ear Hood. ) 



Certhidea cinerascens (p. 768) 

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



Certhidea bifasciata (p. 7G8) 



CERTHIDEA OLIVACEA Gould. 

 DARWIN'S CERTHIDEA. 



A<h(lt male. — Abovo phiin pale olivo, ])ei'()iniiio- moiv olivo-oray on 

 piloiun and hindneck; rump and ii^jpcr tail -co verts moi-o hufi' yolive; 

 wing's and tail du.skv oTa3'ifsh with pale olive edgino\s, 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 a]K)at 4 mm. behind eye), lower eyelid, malar region, chin, 

 and throat (sometimes upper chest also) cinnamon-tawny, tawn}^- 

 ochraceous, or cinnamon-rut'ous; lores and suborbital region pale dull 

 butty; auricular region light butiy grayish; median portion of l)reast 

 and abdomen and under tail-coverts cream buti', 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 iianks grayish buffy 

 or pale olive-V)rown ; maxilla dusk}^ mandible pale brownish or brownish 

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

 darker; length (skins), about tU.5; wing-, 55-57; tail, 87-40; l)ill from 

 nostril, 7.^ 



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

 parts paler (more whitish), with less of the cinnainon-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 Rotii.schild and Hartert. 



