XXXV 



Type. 



Bucco, Briss. Om. iv. p. 92 (1760) B. collaris. 



Cyphos, Spix^ Av. Bras. i. p. 51 (1824) " B. macrodactylus. 



. Nystactes, Gloger, Froriep's Notizen, xvi. p. 277 (1827) B. tamatia. 



Tamatia, Less. Trait. d'Orn. p. 166 (1831) B. tectus. 



Chaunornis, G. R. Gray^ List of Gen. p. 13 (1841) B. tamatia. 



Nystalus, Cab. et Heiti. Mus. Hein. iv. p. 139 (1863) B. maculatus. 



Hypnelus, Cab. et Hein. Mus. Hein. iv. p. 143 (1863) B. bicinctus. 



Nothriscus, Cab. et Hein. Mus. Hein. iv. p. 146 (1863) B. tectus. 



Argicus, Cab. et Hein. Mus. Hein. iv. p. 148 (1863) . . . B. macrodactylus. 



Notharchus, Cab. et Hein, Mus. Hein. iv. p. 149 (1863) B. hyperrhynchus. 



Char. Gen. Rostrum rectum^ capitis longitudine aut eodem vix longius^ validum, intumidum^ ad basin 

 dilatatunij apice uncinato; nares basales, vibrissis frontalibus obtectse; alse breves rotundatse^ remigibus 

 tertio quarto et quinto longissimis, primum fere duplo superantibus ; Cauda modice rotundata, rectricibus xii. ; 

 pedes scansorii, digito primo et secundo congruis, digito secundo omnium longissimo. 



This large genus, as suggested by Wagler, may be divided into two subgenera, distinguished 

 by the form of the bill, as follows : — 



Rostro rotundato ad basin dilatato 1. Bucco. 



Rostro compresso et magis elevato 2. Nystalus. 



The first subgenus [Bucco) comprehends fifteen species, which may be separated as follows : — 



A. Species subtus nigro torquatse. 



a. Albo-rufse, rostro rubro \. B. collaris, p. 61. 



b. Albo-nigrse, rostro nigro. 



a'. Majores ; pileo nigro. 



a". Torque pectorali nigro. 



a!". Fronte et ventre albis^ 



fronte modico albo 2. B. macrorhynchus , p. 65. 



fronte latiore albo 3. S. dysoni, p. 67. 



fronte latissimo albo 4. B. hyperrhynchus, ^. 71. 



b'". Fronte albo^ ventre rufescente 5. B. swainsoni, p. 73. 



c"'. Fronte nigro, ventre albo 6. B.pectoralis, p. 75. 



b". Torque pect. nigro et brunneo 7. B. ordi, p. 77. 



b'. Minores ; pileo albo punctato. 

 c". Torque pect. lato, 



rectr. vi. mediis maculatis 8. B. tectus, p. 79. 



rectr. vi. mediis immaculatis 9. B.picatus, t^. 81. 



d". Torque pect. angusto 10. -B. subtectus, p. 83. 



c. Fusco-rufsej rostro nigi*o. 



c'. Pileo castaneo 11. B. macrodactylus, ^p. 85. 



d'. Pileo fusco, 



torque pect. unico 12. B. ruficollis, p. 89. 



torque pect. duplici 13. 5. bicinctus, p. 91. 



B. Species subtus non torquatse. 



d. Ventris maculis uigris 14. 5. tamatia, p. 93. 



Ventris maculis nigris crebrioribus 15. B.pulmentum, p. 97. 



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