502 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



QEOSPIZA ALBEMARLEI Ridgway. 

 ALBEMARLE GROUND FINCH. 



Similar to G. duhia Imt ))ill averaging smaller, with the culmen 

 slightly more arched.' 



Adult male.—^\m^, 71.63-72.90 (72.14); tail, 43.69-45.21 (44.45); 

 culmen, 16.51-17.78 (17.27); depth of ])ill at base, 12.19-13.97 (13.21); 

 gonys, 8.89-9.40 (9.14); width of mandible at base, 9.91-10.41 (10.16); 

 tarsus, 22.10-22.86 (22.35); middle toe, 15.49-16.00 (15.75).' 



AdvU femaJe.—Wmg, 71.12-73.66(72.14); tail, 43.18-43.69(43.43); 

 culmen, 18.0,3-19.56 (18.80); depth of bill at base, 13.21-14.48 (13.72); 

 gonys, 9.65-10.16(9.91); width of mandible at base, 10.16-10.67 (10.41); 

 tarsus, 22.61-22.86 (22.73); middle toe, 16.00-16.76 (16.51).' 



Galapagos Archipelago (Albemarle * and Narborough islands). 



Geospiza albemarlei RiDGwxY, Proc. U. S. Nat. Mus., xvii, no. 1007, Nov. 15, 1894, 



862 (TagU8 Cove, Albemarle I., Galapagos; IT. S. Nat. Mus.) ; xix, 1897, 523, 



footiKjte. 

 Geospiza duhia alheinarlei Rothschild and Hartekt, Novit. Zool., vi, Aug., 1899, 



160, pi. 6, fig. 23 (Albemarle and Xarborough islands; crit. ). 

 Geospiza fortis (not of Gould) Ridgway, Proc. U . S. Nat. Mus., xix, 1897, 521, part, 



pi. 57, fig. 14 (Albemarle I.). 



GEOSPIZA SIMILLIMA Rothschild and Hartert. 

 SIMILAR GROUND FINCH. 



Similar to G. albemarlei, but w^ing 2-3 mm. longer. 



Geospiza duhia simillima Rothschild and Hartert, Novit. Zool., vi, Aug., 1899, 161 

 (Charles I., Galapagos; coll. Tring Mus. ). 



GEOSPIZA FORTIS Gould. 

 STURDY GROUND FINCH. 



Similar to G. duhia but decidedly smaller, with cidmen nuich less 

 strongly convex. 



Male.— L^n^ih (skins), about 119.38-121.92; wing, 66.04-74.93 

 (71.12); tail, 40.64-46.23(43.18); culmen, 16.00-18.54(17.27); gonys, 

 8.64-10.16 (9.14); depth of bill at base, 11.43-13.46 (12.95); width of 

 mandible at base, 9.40-10.92 (lO.Ki); tarsus, 20.57-22.35 (21.59); mid- 

 dle toe, 14.99-16.51 (15.75).-^ 



'According to Messrs. Rothschild and Hartert, the wing is generally 2.00-4.00 

 longer in this form than in Gr. duhia; these gentlemen do not, however, give any 

 measurements, and I am therefore forced to give my own taken from a much smaller 

 series of specimens. 



^ Two specimens. •' Three specimens. 



* Another form from Albemarle Island has recently been described. [Geospiza 

 fortis fjlatyrht/iicha Heller and Snodgrass, Condor, iii, May, 1901, 75; type from 

 Iguana Cove, Albemarle Island, in Leland Stanford Jr. University collection.) 



^ Eighteen specimens. 



