484 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



Adult female. — Above oliv^e, the feathers of the pileum and back 

 slightl}^ darker centrally, the olive color paler on the rump; wings and 

 tail dull grayish dusky with lighter olive-grayish edgings, these dull 

 buffy on middle and greater wing-coverts; supraloral space and malar 

 region pale dull gra3dsh buffy; chin and throat similar but paler and 

 more gravish; rest of under parts pale buffy fading into nearly white 

 on belly; sides and flanks tinged with grayish olive, and chest ver}' 

 faintly flammulated with the same; bill wholly grayish black; legs 

 and feet dusk}' brown; length (skin), 116.84; wing, 68.58; tail, 41.91; 

 culmen, 12.70; gonys, 7.62; length of bill from rictus, 12.70; width 

 of mandible at base, 7.62; depth of bill at base, 8.89; tarsus, 21.59; 

 middle toe. 14.73.^ 



Galapagos Archipelago (Charles Island). 



CamarJujncJntsjxnqx'r Ridgway, Proc. U. S. Nat. Mus., xii, no. 767, Fell. o,lS90, 

 111 (Charles I., Galapagos Archipelago; collection U. S. Nat. Mus.); xix, 

 1897, 559, pi. 56, fig. 11 (monogr. ). 



Geospiza paiipera Rothschild and Hartekt, Novit. ZooL, vi, Aug., 1899, 169 

 (crit.). 



CAMARHYNCHUS PROSTHEMELAS Sclater and Salvin. 

 BLACK-HEADED GROTJKD FINCH. 



Smallest form of the genus (wing not exceeding 64.77, culmen not 

 more than 11.68); similar in coloration and shape of bill to C. paujMr, 

 but size much less. 



Adult male.- Head, neck, and chest uniform black, ending abruptly 

 beneath in a convex outline; rest of under parts plain buffy white, 

 tinged with olive-gray laterally ; rest of upper parts olive, the feathers 

 of the back with indistinct darker centers; remiges and rec trices 

 dusky, margined with grayish olive, the edges of the outermost pri- 

 maries approaching grayish white; bill, legs, and feet entirely black. 



^ One specimen. 



Although about the same size as C psittaculus (except that the bill is very much 

 smaller) , the relationships of this species are evidently with C. prosthemelas rather 

 than C. 2%sittaculus and allied forms, the bill being even more compressed and elongated. 

 In coloration the adult males resemble them about equally, there being no material 

 difference between the color of fully adult males in the various sjiecies of the group, 

 except in the case of C. salvini 



The adult female most resembles that of C. prostJionelas, but has the chest and 

 sides darker (distinctly brownish buffy), the former without distinct streaks, at least 

 in the single specimen examined. 



An immature bird of undetermined sex (No. 52401, U.S.N.M. ; Charles Island, 

 received from Professor Sundevall) is darker and browner above than the adult 

 female described above, has the under parts paler with distinct dusky streaks on the 

 chest, and has the bill light colored (maxilla light brown, mandible pale dull buffy). 



Messrs. Rothschild and Hartert give measurements of the "oldest birds with 

 black bills" (sexes not distinguished) in their series as follows: Wing, 69.00-73.00; 

 culmen, 12.90-13.50. 



