542 BIRDS OF THE GALAPAGOS ARCHIPELAGO— RIDGW AY. vol.xix 



Immature wj«7e.— Type, No. 115920, U.S.N.M.; Charles Islaud, Gala- 

 pagos, April 8, 1888; U. S. S. Albatross. Dull sooty blackish, uiiilorm 

 oil head, neck, and chest, elsewhere broken by lighter margins to 

 feathers; these edgings dull Jight grayish brown on upper parts, dull 

 brownish white on lower jiarts; sides and tlanks washed with pale 

 brown ; under tail-coverts dull bufify white, with concealed mesial 

 streaks of dusky. Bill entirely black; tarsi deep brown; toes brownish 

 black. Length (skin), 4.50; wing, 2.70; tail, 1.85; culmen,0.72; maxilla 

 from nostril, 0.50; gonys, 0.40; basal width of mandible, 0.37; basal 

 depth of bill, 0.45; tarsus, 0.82; middle toe, 0.62. 



1 refer, with some doubt, to this species a bird from Indefatigable 

 Island (No. 77750, U.S.N.M. ; Indefatigable Island, August 10, 18G8; Dr. 

 A. Ilabel). It is apparently an adult female, with wholly light cinna- 

 mon-colored bill and streaked [)lumage, lacking the buffy margins of 

 the middle and greater wing-coverts and other features which charac- 

 terize young birds in their first year. It certainly can not be referred 

 ^^^____^^____^ to the ordinary " Cactornis" of the same 



y^'^^ l2«Zii^!A^ island, which has the bill altogether longer 



/ ^.^..X^ ty^^^ — ^"^^ '^^ ^^^ same time much narrower in 



f y^'^ both its vertical and transverse diameters. 



■\ /' f The size and shape of the biU agree very 



* closely with those of (}. hrevirostris, though. 



Fig 5. Heart of Oeospiza hrevirostns. • , , , , ■, n a-, t ,v 



as might be expected from the ditiereuce in 

 age or sex, it is not quite so strong. 

 The specimen in question may be described as follows: 

 % Adult female.— ^o. 77756, U.S.N.M.; Indefatigable Island, August 

 10, 1868; Dr. A. llabel. Above dusky, all the feathers margined with 

 grayish olive, this color prevailing (almost uniform, in fact) on the 

 rump; middle and greater wing-coverts margined terminally with a 

 rather more buffy or light brownish hue. but still not ai)i)roaching 

 tawny or rusty; sides of head, chin, and throat dusky or dull blackish 

 brown, faintly streaked with dull whitish, more distinctly along the 

 median line; rest of under parts dull buffy white, immaculate on middle 

 of abdomen, elsewhere broadly streaked with dusky, the streaks giving 

 way on sides and flanks to a nearly uniform light olive. Bill wholly 

 clear deep cinnamon, paler on lower and terminal i)ortions of mandible; 

 legs and feet brownish black. Length (skin), 3.80; Ming, 2.80; tail, 

 1.65 ; culmen, 0.70 ; maxilla from nostril, 0.50 ; gonys, 0.40 ; basal 

 width of mandible, 0.37; basal depth of bill, 0.42; tarsus, 0.87; middle 

 toe, 0.62. 



The form of the bill in this species is exactly intermediate between 

 that of '■'■ Cactornis'^'' scandcns and that of the medium-sized true 

 Geospizcej as G. fortis, G. dubia^ etc. Possibly it is a hybrid. 



