508 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



tion distinctly elev^ated and arched, nasal fossae much hirg-er, and 

 maxillary tomimn more distinctly lobed or convex in middle portion. 

 Female much darker than in an}- allied forms. 



Adult male.- — Entirely uniform deep })lack, the feathers abruptl}' 

 clear slate-gra}" beneath the surface; bill wholly deep black; leg-s and 

 feet brownish black; length (skin), 115.57; wing, 61.72; tail, 38.10; 

 culmen, 14.73; gon^'s, 7.87; Imsal width of mandible, 7.11; basal depth 

 of bill, 9.40; tarsus, 20.32; middle toe, 13.46. ^ 



Adult C^.) female.— Above dull g-rayish dusky (inclining to grayish 

 or olivaceous black on head and neck), feathers margined with olivace- 

 ous; beneath dusky slate, nearl}" uniform anteriorly, but feathers 

 everywhere margined with light T)uffy olive, most broadly on under 

 parts of the body, especially posteriorly, where nearly uniform on 

 belly and Hanks; under tail-coverts light brownish bully, tinged with 

 olive, each with a central longitudinal spot of dusky; bill, legs, and 

 feet brownish black; length (skin), 120.65; wing, 59.69; tail, 36.83; 

 culmen (tip of maxilla broken); gonys, 7.37; basal width of mandible, 

 6.10; tarsus, 20.32; middle toe. 13.72.- 



Galapagos Archipelago (Abingdon Island). 



Geospiza dentirostris (not of Gould) Sclater and Salvix, Proc. Zool. Soo. Lond., 

 1873,323 (Abingdon I.).— Salvin, Trans. Zool. Soc. Lond., ix, pt. ix, 1876, 

 483 (Abingdon I.). 



(? ?) Geospiza fortis (not of Gould) Salvin, Proc. Zool. Soc. Lond., 1883, 421, 

 part (Charles I.). 



Geospiza difficilis Sharpe, Cat. Birds Brit. Mus., xii, 1888, 12 (Abingdon I., 

 Galapagos^ Archipelago; collection Brit. Mus.; "Charles I."). ^ — Ridgway, 

 Proc. U. S. Nat. Mus., xii, 1890, 107 (Abingdon I.); xix, 1897, 532, pi. 57, 

 fig. 20 (monogr.). — Rothschild and Haktert, Novit. Zool., vi, 1899, 163, 

 pi. 6, fig. 33 (Abingdon L; crit.). 



GEOSPIZA DEBILIROSTRIS Ridgway. 

 WEAK-BILLED GROTTND FINCH. 



Similar to G. fortis in size. ))ut feet larger and stouter and l)ill 

 conspicuously smaller. 



Adult male. — Entirely uniform deep black (less intense posteriorly), 

 the feathers abruptly clear slate-gray beneath the surface; lower part 

 of abdomen intermixed with buffy whitish, and longer under tail- 

 coverts In'oadly margined terminally with the same, tinged with light 

 rusty; bill wholl}' deep black; legs and feet brownish black; length 

 (skin), 124.46; wing, 74.42; tail, 43.18; culmen, 15.24; gonys, 7.62; 



iNo. 116117, U. S. Nat. Mus., Abingdon Island, April 16, 1888, C. H. Townsend. 

 Messrs. Rothschild and Hartert give measurements of a series as follows: Wing 

 63.00-64.00; culmen, 14.00-14.80. 



-No. 116118, TJ. S. Nat. Mus., Abingdon Island, April 16, 1888, C. H. Townsend. 



■' I doubt the correctness of the identification, or the locality, of the Charles Island 

 specimen collected by Captain Markham, as do also Messrs. Rothschild and Hartert. 



