522 BIRDS OF THE GALAPAGOS ARCHIPELAGO— RTDGWAY. vol.xix. 



Specijic characters. — Similar to G. dubia, Gould, of Chatham Island, 

 but smaller, the bill especially. Wing, about 2.75-2.85; tail, 1.G5-1.80; 

 culmeu, 0.02-0.68; depth of bill at base, 0.42-0.40; tarsus, 0.80-0.85. 



Ranije. — (ialapagos Archipela<jo: Albemarle Island (Townsend); Dun- 

 can Island (Banr and Adams) ; Charles Island (Darwin, Kinberg, Town- 

 send, Baur and Adams) ; Indefatigable Island (Habel, Albatross) ; James 

 Island (Kinberg, Albatrons}; Bindloe Island (Habel). 



Ad 1(1 f )iialc. — Xo. 125037, U.S.N.M.; Charles Island, Galapagos, April 

 1, 1891 ; C. H. Townsend. Uniform deep black, most intense anteriorly, 

 tinged with dark olive gray posteriorly, the feathers abruptly clear slate- 

 gray beneath the surface; under tail-coverts broadly margined with 

 buflfy whitish; bill wholly deep black; legs and feet blackish brown. 

 Length (skin), 4.80; wing, 2.82; tail, 1.75; culnien, 0.G2; gonys, 0.35; 

 basal width of mandible, 0.37; basal depth of bill, 0.48; tarsus, 0.80; 

 middle toe, 0.02. 



Immature male. — No. 125939, U.S.N.M,; same locality, etc. Above 

 dull grayish black, the feathers indistinctly margined with olive-gray, 

 this color prevailing on rump and upper tail-coverts; beneath dull gray- 

 ish white, faintly tinged with pale butiy, broadly striped with black, 

 these black stripes or longitudinal spots broader anteriorly, nuich 

 exceeding the whitish interspaces on chin, throat, and chest; hill 

 wholly deep black; legs and feet blackish brown. Length (skin), 4.70; 

 wing, 2.80; tail, 1.65; culmen, 0.65; gonys, 0.35; basal width of mandi- 

 ble, 0.37; basal depth of bill, 0.49; tarsus, 0.82; middle toe, 0.(51. 



Adult female. — Xo. 125940, U.S.X.M.; same locality, etc. Similar 

 above to the innnature male, as described above, but feathers more 

 distinctly margined with grayish olive, the rump nearly unilbrn ly of 

 this color; ground-color of under parts more tinged with bully than in 

 immature male, and with blackish markings less coalesced on anterior 

 jjortions; maxilla blackish brown, mandible i)ale brown, becoming 

 blackish brown basally ; legs and feet dark horn brown. Length (skin), 

 4.65; wing, 2.82; tail, 1.65; culmen, 0,05; gonys, 0.33; basal width of 

 mandible, 0.37; basal depth of bill, 0.48; tarsus, 0.85; middle toe. 0.58. 



Immature female. — No. 77752, U.S.N.M.; Indefatigable Island, (iala- 

 pagos, August 10, 1808; Dr. A. Habel. Pileum as in adult female; 

 rest of upper parts rather light grayish olive, the feathers of the ba(;k, 

 etc., dusky centrally, producing a clouded appearance; rump uniform 

 light olive or butty olive; middle and greater wing-coverts broadly 

 margined with light dull cinnamon or wood brown; under parts dull 

 buffy whitish, washed with light buflly brown on sides and Hanks; chin 

 and throat clouded with grayish dusky; fore neck and <;hest marked 

 with triangular longitudinal spots of the same, the breast and anterior 

 portion of sides similarly but less distinctly marked. Bill pale cinna- 

 mon-brown ])assing into pale bull on under portion of mandible and 

 into deeper brown on basal part of maxilla; legs and feet blackish 

 brown. Length (skin), 4.50; wing, 2.85; tail, 1.80; culmen, 0.(18; gonys, 



