766 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



CERTHinEA MENTALIS Ridgway. 

 TOWER ISLAND CERTHIDEA. 



Siiuihir to (\ fusea^ but rather .sinullcr; coloi- diirker and less oliva- 

 ceous, the under parts dull light olive-^rrayish IxM-oniinji;' pale l)uti'v on 

 chill and under wing-coverts. 



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

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

 ually' on chest to butfy gray, which covers whole chest, u})per breast, 

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

 indistinct whitish supraloral streak; wing, 5;^, 1; tail. -to. 1; exposed 

 culnien, 10.2; tarsus, 20.3. 



Of the five specimens examined one has the mandi})le apparently 

 ])lack, one dark ])rown, the other three brownish white. 



Galapagos Archipelago (Tower Island). 



Ctrthklea mciiluli.^ RnxnvAY, Proc. U. 8. Nat. Mils., xvii, no. 1007, Nov. 15, 1894, 

 359 (Tower I., (;alai)agos ArcliiiK-lajro; coll. r)r. <i. l^aur); xix, 1S97, 504 

 (monogr. ). 



Cerfliidea olintrea iiiiiit(ili>< IIotiisciiilo and Hakteih', Novit. Zool., vi, Auir., 1899, 

 150 (Tower 1.). 



CERTHIDEA FUSCA Sclater and Salvin. 



HABELS CERTHIDEA. 



Similar to 6'. oliixicea^ but darker and less olivaceous above, the 

 under parts butfy grayish white or very pale yellowish oliv^e-gra}'; 

 bill more dusky (wholly l)lack 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. T).^ 



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

 lar, but rather paler on tips of griniter and middle coverts; su[)raloral 

 streak, orbits, and lower parts generally dull pale grayish butfy (the 

 buff clearer and more pronounced on throat), deepening on sides and 

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

 erts into butty whitish; bill brownish ])lack, 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 fcuudef. — Similar to the male as described above, but 

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

 with t)uttv; basal half of mandil)leand maxillary tomium horn l)roW'n; 

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

 sus, 20.3; middle toe, 11.9.' 



'Five specimens. ■^No. 116100, coll. IT. S. Nat. Mus. 



»No. 116102, coll. U. 8. Nat. Mus. 



