476 BULLETIN 50, TTNITED STATES NATIONAL MUSEUM 



Genus CAMARHYNCHUS Gould. 



Camarhynchus GouhB,FTOC. Zool.Soc, pt. 5, 1837, 6. {Type, C. psUtacula Gould.) 

 Cactospiza Ridgway, Proc. U. S. Nat. Mus., xix, no. 116, March 15, 1897, 546. 

 (Type, Caclomis pallidus Sclaterand Salvin. ) 



Similar to Platyspiza but bill very different, being much more 

 compressed (basal width of tnandible not greater, sometimes less, than 

 length of gonys), with commissure nearly straight or with the basal 

 deflection much less abrupt, and the angle of mandibular tomium not 

 toothed; some of the species without any black in adult males. 



There being an almost unbroken transition, in diflEerent species, 

 from the short and stout bill of G. psittaculus to the long and narrow 

 one of C. pallidMS, while the coloration of the latter is practically 

 identical with that of those Camarhynchi of which the adult males are 

 destitute of any black areas to the plumage and consequently conspic- 

 uously different from that of the narrow-billed Gempizw (representing 

 the formerly current genus Oactornis)^ I am fully convinced that ref- 

 erence "■ of O. pallidus and the related G. productus to Gamarhynchvs 

 is correct. I am sorry to have to disagree in this matter with the 

 views of Messrs. Eothschild and Hartert,'' but the case seems so very 

 clear to me that I can see no reason whatever for changing mj^ opinion 

 as to the relationship of the species named, which evidentl}'^ bear to 

 the typical (thick-billed) species of GamarliyncTius the same relation 

 that the true Ccwtornithes do to the typical Geospizm. 



Range. — Peculiar to the Galapagos Archipelago. 



KEY TO THE SPECIES OF CAMARHYNX-HUS. * 



a. Baaal depth of bill equal to or greater than length of -naxilla from nostril. {Cama- 

 rhynchus. ) 

 b. Head, neck, and chest blackish. {Adult mcdes. ) 

 c. Larger (wing 68.07 or more, culmen not less than 12.45, usually much more). 

 d. Bill larger (culmen 14.73 or more). 

 e. Bill stouter (depth at base 10.67 or more, width of mandible at base 8.38 

 or more). 

 /. Larger, with smaller bill (wing averagiug 72.90, culmen averaging 15.24, 

 depth of bill at base averaging 11.43, width of mandible at base aver- 

 aging 9.14, tarsus averaging 23.37). (James, Indefatigable, Barring- 

 ton, Jervis, Duncan, and Charles islands.) 



CamarhyucliTis psittaculus (p. 477) 

 ff. Smaller, with longer and narrower bill, shorter gonys, and more promi- 

 nent gonydeal angle; wing averaging 69.85, culmen averaging 16.76, 

 depth of bill at base averaging 10.92, width of mandible at base aver- 

 aging 8. 38, tarsus averaging 22. 35. ( Abingdon and Bindloe islands. ) 



Camarhynchus habeli (p. 480) 



1 Proc. TJ. S. Nat. Mus., xix, 1897, p. 544. 

 ' Novitates Zoologicse, vi, 1899, pp. 165, 166. 



'Adult males of C. compressiroftris and C. incertus, which are presumably black- 

 headed, are as yet unknown. 



