504 



BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



GEOSPIZA FRATERCULA Ridgway. 

 LESSER GROUND FINCH. 



Similar to (t. forf/s hut sinallor. with narrower V)ill and nioro con- 

 vex culmen. 



Male.— IjQwgih (skins), about 118. 11-120. «i5: wing, ()4. 26-07.31 

 (65.79); tail, 38.61-43.18 (41.15); culmen, 16.51-17.27 (17.02); gonys, 

 9.14-9.65 (9.40); depth of bill at base, 11.18-13.21 (12.19); width of 

 mandible at base, 9.14-10.16 (9.6.5); tarsus. 19.81-20 57 (20.07): mid- 

 dle toe, 13.97-14.99 (14.48).^ 



Galapagos Archipelago (Abingdon and Bindlo(^ islands). 



Geof<piza fortis (not of Gould) Salvix, Tran:^. Zool. Soc. LoikL, ix, pt. ix, 1876, 

 p. 481, part (Abingdon I. ).— Ridgway, Proc. V. S. Nat. Mus., xii, 1890, 

 p. 107 (Abingdon I.); xix, 1899, 521, part (Bindloe I.). 



Geospiza fratercula Ridgway, Proc. U. S. Nat. Mus., xvii, no. 1007, Nov. 15, 1894, 

 363 (Abingdon I., Galapagos Archipelago; collection II. S. Nat. Mus.) ; xix, 

 1897, 525, pi. 57, fig. 16 (monogr.). 



Geospizn fortis fnitcraild Rothschild and Hartkrt, Novit. Zool., vi, Aug., 1899, 

 161 (Abingdon and P>indloe islands; crit.). 



GEOSPIZA FULIGINOSA Gould. 

 SOOTY GROUND FINCH. 



Similar to G. fmterctiln l)ut smaller, especially the bill. 



J/c//c.— Length (skins), about 101.60-105.41; wing, 59.69-71.12 

 (63.50); tail, 35.56-42.42 (39.12); culmen, 11.94-14.73 (13.21); gonys, 

 6.10-7.62 (6.86); depth of bill at base, 7.87-10.92 (8.64); width of 

 mandible at base, 5.84-7.62 (6.86); tarsus, 18.54-20.83(19.81): middle 

 toe, 10.92-15.24 (13.72).' 



i^^ma^^.— Length (skins), about 101.60-105.41; wing, 58.42-64.01 

 (61.47); tail, 34.80-40.13 (37.85); culmen,, 11.18-13.97 (12.70); gonys, 

 6.10-7.37 (6.86); depth of bill at base, 7.62-8.89 (8.13); width of man- 



' Seven specimens, the average measurements of specimens from different islands 

 being as follows: 



No females of this form have been examined by me. 

 ■^ Forty-nine specimens. 



