BIRDS OF NORTH AND MIDDLE AMERICA. 765 



tail-coverts, many of the feathers of top of head, hindneck, and hack 

 showing very indistinct tips of dusky, producing a very faintly mot- 

 tled appearance; greater wing-co verts conspicuously edged and tipped 

 with bright tawny; secondaries edged with tawny-olive; sides of head 

 and neck, throat, and chest nearly uniform dull light grayish brown, 

 mixed with pale dull buflfy, the feathers dusky gray basally; sides 

 and flanks similar but browner; median portion of under parts, pos- 

 terior to chest, dull pale buflfy, nearly white on lower belly and anal 

 region.' 

 Galapagos Archipelago (Chatham Island). 



Certhidea olivacea (part) Gould, Zool. Voy. Beagle, iii, Birds, 1841, 106 (Chat- 

 ham I., Galapagos Archipelago). — Salvin, Trans. Zool. Soc. Lond., ix, pt. 

 ix, 1876, 476, part (Chatham I.).— Sclater, Cat. Birds Brit. Mus., xi, 1886, 

 28 (Chatham I.).— Ridgway, Proc. U. S. Nat. Mus., xii, 1889, 105 (part), 121 

 (Chatham I.). 



Certhidea luteola Ridgway, Proc. U. S. Nat. Mus., xvii, no. 1007, Nov. 15, 1894, 

 360 (Chatham I., Galapagos Archipelago; coll. Dr. G. Baur) ; xix, 1897, 501 

 (monogr.) . 



Certhidea olivacea luteola Rothschild and Haktert, Novit. Zool., vi, Aug., 1899, 

 149 (Chatham I.; crit.). 



CERTHIDEA RIDGWAYI (Rothschild and Hartert). 

 CHARLES ISLAND CERTHtDEA. 



Similar to C olivacea, but under parts much paler and less olivaceous; 

 upper parts more grayish; rufous-cinnamon of throat more rusty; 

 whitish tips to rectrices broader (1-1.5 mm. wide); bill usually deep 

 black. 



Young. — Above dusky blackish brown, the pileum almost uniform 

 black, the feathers of the back and rumj), and the upper tail-coverts 

 broadly edged with light brown, narrowly margined at tips with black, 

 and ash-gray at base; wings with light brown edgings, more rusty on 

 the coverts; feathers of under parts ash gray basally, then dark slate 

 color, their tips rusty buff; throat patched with blackish slate color, 

 caused by the greater extent of the slaty color in the middle of the 

 feathers.^ 



Galapagos Archipelago (Charles Island). 



According to Messrs. Rothschild and Hartert, the color of the 

 under parts in this form resembles that of C. cinerascens, " but is not 

 so white, and the adult males have a red \i. e. , rusty] throat, which is 

 apparently never assumed by O. cinerascens.'''' 



Certhidea olivacea ridgwayi Rothschild and Hartert, Novit. Zool., vi, Aug., 1899, 

 149 (Charles I., Galapagos Archipelago; coll. TringMus. ). 



'No. 115940, coll. U. S. Nat. Mus., Chatham Island (high hills), Apr. 5, 1888; 

 C. H. Townsend. 

 ^Description adapted from Rothschild and Hartert. 



