510 BIRDS OF TEE GALAPAGOS ARCHIPELAGO— BIDGW AY. voi.xix 



C-. Gonys less thau 0.50 of au inch. (Chatham Island; Albemarle Island?,) 



4. G.dubia (p. 519). 

 b'. Bill moderately short and thick, its depth at base little if any greater thau 

 length of maxilla from nostril, 

 c'. Length of maxilla from nostril more than 0.50. 

 d ' . Culmen nearly straight, much exceeding 0.80 (0.85-0.95). (Hood Island. ) 



5. G. ronirobtris (p. 516). 

 d-. Culmeu decidedly convex, not exceeding 0.80 (0.78-0.80). 

 c'. Larger: Wing 3.20, depth of bill at base 0.68. (James Island.) 



6. G. baioi (p. 518). 

 e^ Smaller: Wing 2.90-3.10, depth of bill at base 0.60-0.65. (Hood 



i»l*»"^^-) 7. G. media (p. 517). 



c^. Length of maxilla from nostril less than 0.50. 

 ri'. Wing 2.50 or more. 

 eK Depth of bill at base not less than 0.50 (0.50-0.53). (Charles, Chat- 

 ham, James, Indefatigable, Albemarle, and Bindloe islands.) 



8. G. fort is (p. 521). 

 e". Depth of bill at base less than 0.50. 

 /'. Depth of bill at base 0.40 or more. (Abingdon Island.) 



9. li./rutercula (p. 525). 

 /-. Depth of bill at base less than 0.40. (Chatham. James, Indefatiga- 

 ble. Duncan, Charles, Hood, Albemarle, and Abingdon islands.) 



10. G.fuUgiiiosa (p. 526). 

 rf*. Wing less than 2.50. 



e'. Bill shorter (from nostril 0.30), culmen more curved. (James, 

 Bindloe, Abingdon, and Chatham islands.) 



11. G.parvula (p. 529). 

 e\ Bill longer (from nostril 0.40), more acute, culmen nearly straight. 



^ (Tower Island.) 12. G.acutirostris (p.^31). 



a-. Depth of bill at base less than length of maxilla from nostril, 

 ft'. Maxillary tomium slightly toothed. (Charles Island ; Chatham Island.) 



13. G.deutirostris (1^.532). 

 h^. Maxilliary tomium not toothed. 



c'. Culmen nearly straight, much elevated basally ; wing 2.35-2.45. 



(Abingdon Island; Charles Island^?) . ... 14. (;. rfi.^d7(s(p. 532). 

 C. Culmen more convex, less elevated basally; wing 2.90. (James 



Island.) 15. q^ debilirostris (p. 533). 



Subgenus CACTORNIS. 



a'. Depth of bill at nostril not exceeding length of gonys. 

 b '. Culmen not more than 0.72. (James Island) . . 16 (1). G. scandevs (p. 534). 

 b'. Culmen 0.75 or more. 

 C-. Culmen not more thau 0.79, basal depth of bill not more than 0.40. 



(Charles Island) 17 (2)'. G. intermedia (p. 535). 



c«. Culmen not less than 0.79, basal depth of bill not less thau 0.40 



(Bindloe Island) IS (3). G. assimilis {-p. 537). 



(Indefatigable Island) 19(4^. q. fatigata (p. 539). 



(Abingdon Island) 20 {5). G. abxngdoni ^p.o\0). 



^ (Barrington Island) '21 (&). G barringtoni {p.bU). 



a-. Depth ot bill at nostril exceeding length of gonys. 



b\ Smaller, witji more slender and i)oiuted bill; culmen 0.70-0.72, wing 



2.70-2.80. (Charles Island; Indefatigable Island?.) 

 ,. ^ 22 (7). G. 6;-erJro8/m (p. 541). 



b . Large, with stouter and blunter bills; culmen 0.82-0.90, wing 2.95-3.15 

 (Tower Island) 23(8). G. propinqua {p.U3). 



