498 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



G.[^eospiz((^ tnagitlrostris Mrt'TtMn Rothschild and Hartekt, Novit. Zool., vi, Auj^., 



1899, 155, in text. 

 Geospiza mngnirostris (not of Gould) Bath, Am. Nat., xxv, 1891, 905 (South 



Albemarle and Jervis islands). 

 Geospiza strenua-magnrrostris Baur, Am. Nat., xxxi, 1897, 78.3 (Jervis I.). 



GEOSPIZA PACHYRHYNCHA Ridgway. 

 THICK-BILLED GROUND FINCH. 



Similar to G. sfrem/r/ but l)ill niueh thicker and broader at the base 

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

 rostrw. 



Adult male. — Wing. 87.O0-S9.00 (SS.OO); 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). 



Geospiza 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.). 

 G-leospiza] strenua pachyrhijncha Rothschild and Hartert, Novit. Zool.. vi, 



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

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



155, part, pi. 6, figs. 7-9 (Tower 1.). 



GEOSPIZA CONIROSTRIS Ridgway. 

 CONICAL-BILLED GROUND FINCH. 



Similar to G. stremia 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 duskv prevail- 

 ing on under parts. 



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

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



Adult 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 n]iddle portion. 



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

 mandible pale brownish, with base and tip dusky. 



Inihiature {'() female. — Aho\Q dull sooty; anterior lower parts simi- 

 lar, but indistinctly streaked with pale grayish butfy, this graduall}' 

 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. 



