602 



BIRDS OF THE GALAPAGOS ABCHIPELAGO—RTDGWAY 



parts, posterior to chest, dull pale bufly, nearly white on lower belly 

 and anal region. 



There are seven specimens of this very distinct form in Dr. Baur's 

 collection, and six in the National Museum collection. None of the 

 latter are in perfect plumage, however, and I have accordingly been 

 obliged to select one of Dr. Baur's si)ecimens as the type. 



Two of Dr. Baur's specimens (both adult males, obtained June 17 and 

 18, while "in full song'') and one of the United States National 

 Museum specimens (obtained March 30, and in greatly worn plumage) 

 have the bill entirely deep black. All the rest have the under mandi 

 ble pale brownish, the upper deep brown or dusky. Among the latter 

 are apparently adult birds of both sexes, obtained April 5 and June 

 16-18; but they may be young birds which have just assumed the adult 

 plumage. 



Measurements of Certhidea luteola. 



T,r- IS" Sex and age. 



115939 1 U. S. 

 125908 : U. S. 



135654 I U.S. 



135655 U.S. 



Locality. 



Adult Chatham Island. 



Adult male do 



Adult 

 do. 



do 

 .do. 



Average. 



Date. 



Wing. 



Apr. 5,1888 

 Mar. 30, 1891 

 Apr. 4,1888 

 do 



Tail. 



Ex- 

 posed 

 cul- 

 men. 



2.1 



2.06 1.40 0.43 



2.05 1.48 .40 



2.06 1.43 I .41 



2.06 



1.44 



.41 



Tar- 

 sus. 



Mid- 

 dle 

 toe. 



0. 83 0. 48 



.81 .48 



.81 .48 



.85 .48 



.82 



.48 



CERTHIDEA FUSCA, Sclater and Salvin. 



Certhidea fusca, Sclater and Salvin, Proc. Zool. Soc, 1870. pp. 323, 324 (Abing 

 don and Bindloe islands, Galapagos Arcliipelago) ; Noui. Av. Neotr., 1873, 

 p. 16.— Salvin, Trans. Zool. Soc, IX, I't. ix, 1876, p. 477.— Sclater, Cat. 

 Birds Brit. Mas., XI, 1886, p.28.— Riduway, Proc. U. S. Nat. Mus., XII, 188!;>. 

 pp. 105, 119, 123, 124, 126 (Abingdon Island). 



Specific characters. — Similar to C. oUvacea, Gould, but darker and less 

 olivaceous, the under parts buflfy grayish white or very pale yellowish 

 olive-gray; bill more dusky (wholly black in adult male); adult male 

 without tawny or ochraeeous-buff on throat or superciliary region. 



Range. — Galapagos Archipelago: Abingdon Island (Habel, Town- 

 send; Bindloe Island, Habel). 



Adidt male— 'So IIGIOO, U.S.N.M., Abingdon Island, April IG, 1888, 

 C. H. Townsend. Above uniform grayish olive, the wing edgings sim- 

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

 streak, orbits, and lower parts generally dull pale grayish buH'y (the butf 

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

 into buffy olive-grayish and fading on belly and under-tail coverts into 

 bufly whitish. Bill brownish black, rather paler on basal portion of 

 mandible; tarsi dark horn color, toes darker. Length (skin), 3.95; 

 wing, 2; tail, 1.40; exposed culmeu, 0.40; tarsus, 0.80; middle toe, 0.45. 



