498 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



O.[eospiza} magnirostrk strenua Rothschild and Hartert, Novit. Zool., vi, Aug., 



1899, 155, in text. 

 Oeospiza magnirostris (not of Gould) Baur, Am. Nat., xxv, 1891, 905 (South 



Albemarle and Jar vis islands). 

 Oeospiza strenua-magnirostrw Baub, Am. Nat., xxxi, 1897, 783 (Jervis I.). 



GEOSPIZA PACHYRHYNCHA Ridgway. 

 THICK-BILLED OROUNI) FINCH. 



Similar to G. xtrenua but bill much thicker and broader at the base 

 than in that form, in this respect nearly or quite equaling G. inagtii- 

 rostris. 



Adult male.—W'mg, 87.00-89.00 (88.00); culmen, 24.00-26.00 

 (25.02); gonys, 12.00-13.50 (12.80); width of mandible at base, 17.00- 

 17.50 (17.20); depth of bill at base, 22.00-22.50 (22.20).^ 



Galapagos Archipelago (Tower Island). 



Oeospiza pachyrhyncha Ridgway, Proc. U. S. Nat. Mus., xviii, no. 1067, April 



23, 1896, 293 (Tower I., Galapagos Archipelago; collection of Dr. G. Baur);^ 



xix, 1897, 516, pi. 19, fig. 9 (monogr.). 

 O-leospiza] strenua pachyrhyncha Rothschild and Hartert, Novit. Zool., vi, 



Aug., 1899, 156, in text (crit.). 

 Oeospiza strenua (not of Gould) Rothschild and Hartert, Novit. Zool., vi, 1899, 



155, part, pi. 6, figs. 7-9 (Tower I.). 



GEOSPIZA CONIROSTRIS Ridgway. 

 CONIOAL-BILIED GROUND FINCH. 



Similar to G. strenua but slightly smaller, with the bill relatively 

 longer, much narrower, and with the culmen less arched; plumage 

 darker in both sexes, the adult male deeper black, adult females and 

 immature birds more uniformly dusky above and with dusky prevail- 

 ing on under parts. 



Adult male. — Uniform black, the longer under tail-coverts margined 

 (rather broadly) with white; bill wholly black; legs and feet black. 



A&ult female {and some males). — Dull black or slate -dusky, broken 

 on abdomen, flanks, etc., by dull whitish edgings to feathers; all the 

 under tail-coverts margined with dull whitish; mandible dull whitish 

 in middle portion. 



Immatitre (?) male. — Similar to adult female, but rather more sooty; 

 mandible pale brownish, with base and tip dusky. 



Immature {1) female. — A\>o\e dull sooty; anterior lower parts simf- 

 lar, but indistinctly streaked with pale grayish buffy, this gradually 

 increasing posteriorly until it becomes the prevailing color and the 

 sooty reduced to broad streaks. 



' Three specimens, measured by Messrs. Rothschild and Hartert. 

 ^ Now in the Tring Museum collection. 



