476 BULLETIN 50, UNITED STATES NATIONAL MUSEUM 



Genus CAMARH YNCHUS Gould. 



Camarkynchun Gould, Proc. Zool. Soc, pt. 5, 1837, 6. (Type, C. psiUacula Gould. ) 

 Cacfospiza Kidgway, Proc. U. S. Nat. Mus., xix, no. 116, March 15, 1897, 546. 

 (Type, Cactornis paUidus Sclaterand Salvin. ) 



Similar to Platyspiza but bill very different, being- much more 

 compressed (basal width of mandible 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 an}- black in adult males. 



There being an almost unbroken transition, in different species, 

 from the short and stout bill of C j^sittctciilus to the long and nai'row 

 one of C. 2Mllidus, 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 Geosjyizcf (representing 

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

 erence^ of 0. jMllidu.^ a,nd. the related 0. jjroduct us to CnmarJiynchus 

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

 views of Messrs. Rothschild and Hartert.^ but the case seems so very 

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

 as to the relationship of the species named, which evidently bear to 

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

 that the true CactornUhes do to the typical Geosjyisct'. 



Range. — Peculiar to the Galapagos Archipelago. 



KEY TO THE SPECIES OF CAMAKHYNCHUS. '' 



a. Basal dei^th of l)ill equal to or greater than length of maxilla from nostril. (Ca?Ho- 

 rJiyncJius. ) 

 h. Head, neck, and chest blackish. {Adult males.) 



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

 d. Bill larger (culmen 14.73 or more). 



e. Bill stouter (depth at base 10.67 or more, width of mandible at l)ase 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.) 



Camarhynchus 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. ( Al)ingdon and Bindloe islands. ) 



Camarhynclius habeli (p. 480) 



^ Proc. U. S. Nat. Mus., xix, 1897, p. 544. 

 - Novitates Zoologies, vi, 1899, pp. 165, 166. 



^Adult males of C. compressirostris and C. incertus, which are presumalily black- 

 headed, are as yet unknown. 



