766 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



CERTHIDEA MENTALIS Ridgway. 

 TOWER ISLAND CEETHIDEA. 



Similar to C. fusca^ but rather smaller; color darker and less oliva- 

 ceous, the under parts dull light olive-grayish becoming pale bufFy on 

 chin and under wing-coverts. 



Adult. — Above uniform deep grayish olive; chin, throat, and under 

 wing-coverts pale buff, deepest on chin, that of throat changing grad- 

 ually on chest to buffy gray, which covers whole chest, upper breast, 

 sides, and flanks; belly dull whitish; under tail-coverts buffy white; an 

 indistinct whitish supraloral streak; wing, 52.1; tail, -tO.l; exposed 

 culmen, 10.2; tarsus, 30.3. 



Of the five specimens examined one has the mandible apparently 

 black, one dark brown, the other three brownish white. 



Gralapagos Archipelago (Tower Island). 



Cerlhidm mmlalis Ridgway, Proe. U. S. Nat. Mus., xvii, no. 1007, Nov. 15,1894, 

 359 (Tower I., Galapagos Archipelago; coll. Dr. G. Baur); xix, 1897, 504 

 (monogr. ). 



C'erthidea oHmceo menlalis Rothschild and Hartbrt, Novit. Zool., vi, Aug., 1899, 

 150 (Tower I.). 



CERTHIDEA FUSCA Sclater and Salvin. 

 HABEL'S CERTHIDEA. 



Similar to O. oUvacea, but darker and less olivaceous above, the 

 under parts buflfy grayish white or very pale yellowish olive-gray; 

 bill more dusky (wholly black in adult male); adult male without 

 rufescent coloring on throat or superciliary region ; wing, 50.8-52.3 

 (51.8); tail, 33-36.8 (35.6); exposed culmen, 10.7-11.4(11.2); tarsus, 

 20.3-20.8; middle toe, 11.4-12.2 (11.7).' 



Adult male. — Above uniform grayish olive, the wing-edgings simi- 

 lar, but rather paler on tips of greater and middle coverts; supraloral 

 streak, orbits, and lower parts generally dull pale grajash buffy (the 

 bufi' clearer and more pronounced on throat), deepening on sides and 

 flanks into buffy olive-grayish and fading on belly and under tail-cov- 

 erts into buffy whitish; bill brownish black, rather paler on basal 

 portion of mandible; tarsi dark horn color, toes darker; length (skin), 

 100.3; wing, 50.8; tail, 35.6; exposed culmen, 10.2; tarsus, 20.3; 

 middle toe, 11.4.^ 



Adult female?. — Similar to the male as described above, but 

 slightly paler beneath and on sides of head, with throat less tinged 

 with bufl'y; basal half of mandible and maxillary tomium horn brown; 

 length (skin), 102.8; wing, 51.3; tail, .36.1 exposed culmen, 10.7; tar- 

 sus, 20.3; middle toe, 11.9.' 



'Five specimens. ^j^o. 116100, coll. U. S. Nat. Mus. 



'No. 116102, coll. U. S. Nat. Mus. 



