ART. 10 BIRDS OF PINCHOT EXPEDITION FISHER AND WETMORE 63 



Albemarle, Chatham, Hood, Barrington, Charles, Duncan, and 

 Indefatigable Islands. The series is quite uniform in structural 

 characters with the usual variations in plumage markings due to 

 relative age. Some of the males in full black dress have the bills 

 pale-colored and in some they are black. 



GEOSPIZA FORTIS Gould 



Sturdy ground finch 



Gcospiza fortis Gould, Proc. Zool. Soc. Loudon, October 3, 1S37, p. 5. 

 (Galapagos Islands.) 



One adult male of this form was collected on Seymour Island, 

 near Indefatigable, June 21, 1929, and two, an immature male and a 

 female, on Charles Island June 28. The adult male from Seymour 

 has the following measurements: Wing, 71.8; tail, 42.7; culmen from 

 base, 17.1; depth of bill, 12.7; tarsus, 22.8 mm. The female from 

 Charles Island measures: Wing, 70.0; tail, 43.8; culmen from base, 

 17.0 ; depth of bill, 11.9 ; tarsus, 22.0 mm. 



GEOSPIZA ALBEMARLEI Ridgway 



Albemarle ground fincli 



Geospiza albemarlei Ridgway, Proc. U. S. Nat. Mus., vol. 17, November 15, 

 1S94, p. 362. (Tagus Cove, Albemarle Island, Galapagos Archipelago.) 



The series of eight skins of this species, including one immature 

 and three adult males and four females, was obtained on Albemarle 

 Island August 22 and 25, those taken on the 22d coming from 

 Villamiel. The adult males have the bill black with a slight wash 

 of brown on the gonys. 



The following measurements were taken from this series : 



Males, wing, 73.2, 76.0, 73.8; tail, 41.0, 46.3, 44.5; culmen from 

 base, 18.0, 17.5, 18.7; tarsus, 23.0, 22.9, 22.5 mm. 



Females, wing, 71.4, 73.2, 70.3, 67.3; tail, 44.0, 47.4, 45.3, 40.5; 

 culmen from base, 15.3, 17.9, 17.8, IG.l; tarsus, 22.0, 21.7, 22.2, 

 21.6 mm. 



GEOSPIZA DUBIA Gould 

 Dubious ground finch 



Geospiza dubia Gould, Proc. Zool. Soc. London, October 3, 1837, p. 6. (Gala- 

 pagos Islands.) 



A pair of these finches came from Chatham Island, collected July 

 4, 1929. They measure as follows : 



Male, Aving, 73.0; tail in molt; culmen from base, 18.2; depth of bill, 

 15.0; tarsus, 23.3 mm. Female, wing, 68.6; tail, 45.1, culmen from 

 base, 17.3; depth of bill, 14.0; tarsus, 22.8 mm. 



