BUCCO. 511 



the large species of the B. dysoni section when compared with B. radiatus and its 

 allies, but other forms are somewhat intermediate. The bill has a distinct hook at the 

 end of the maxilla, which is preceded by a depression in the tomia ; and opposite this 

 is a corresponding depression in the maxilla. In many species the end of the mandible 

 is cleft, and the point of the maxilla fits into the fork when the bill is closed. This is 

 very clearly seen in B. ruficollis, but is present to a slight extent in the other 

 species. 



The species of Bucco range over the greater part of the Neotropical region, and 

 extending northwards as far as the Isthmus of Tehuantepec spread over the whole of 

 the lowlands of Central and South America as far as Southern Brazil and Bolivia, the 

 metropolis of the genus being probably Guiana and the Amazons Valley. 



Five species occur within our limits, of which B. dysoni only has a wide range ; the 

 other four are found in the State of Panama, none of them passing much beyond 

 the Line of the Panama Railway, and one, B. ruJicolUs, only reaching the Isthmus of 

 Darien. None of the species are peculiar to our region. 



1. Bucco dysoni. 



Bucco dysoni, G. K. Gray in Mus. Brit. ' ; Scl. P. Z. S. 1855, p. 193 ' ; Mon. Jacamars and Puff- 

 birds, p. 67, t. 31 ' ; Cat. Birds Brit. Mus. xix. p. 182 *; Scl. & Salv. Ibis, 1860, p. 40 ' ; 

 P. Z. S. 1864, p. 363 ° ; Lawr. Ann. Lye. N. Y. vii. p. 318 ' ; Bull. U. S. Nat. Mus. no. 4, 

 p. 30'; Salv. P. Z. S. 1870, p. 201'; Ibis, 1872, p. 322"; Gat. Strickl. Coll. p. 429"; 

 Sumichrast, La Nat. v. p. 239''; Nutting, Pr. U. S. Nat. Mus. v. p. 401"; Zeledon, An. 

 Mus. Nac. Costa Rica, 1887, p. 120 " ; llichmond, Pr. U. S. Nat. Mus. xvi. p. 513". 

 Notharchus dysoni, Cab. & Heine, Mus. Hein. iv. Heft 1, p. 149 ". 

 Tamatia gigas, Bp. Consp. Vol. Zyg. p. 13 ". 

 Bucco leucocrissus, Scl. P. Z. S. 1860, p. 284". 

 Bucco napensis, Scl. Cat. Am. Birds, p. 269 ". 



Supra niger, dorso, uropygio necnon aKs et tectricibus suia stricte albo fimbriatis, interscapulio et capite summo 

 immaeulatis ; fronte, superciliis, gutture toto, tectricibus auricularibus, torque cervicali et abdomine albis, 

 loris cum stria postoculari et torque subpectorali nigris, bypochondriis albis nigro transfasciatis ; cauda 

 nigricante ; rostro nigro, pedibus plumbeis. Long, tota 10-0, alse 4-6, caudse 3-45, rostri a rictu 1-9, 

 tarsi 0-85. (Descr. maris ex Escuintla, Guatemala. Mus. nostr.) 

 5 man omnino similis. 



Eal. Mexico, Santa EfigeniaSia and Tapanatepec i^ in Tehuantepec (Sumichrast); 

 British Honbueas, Cayo {Blancaneaux) ; Guatemala (mus. StricMand ^i), Forests 

 of Northern Vera Paz, above Escuintla, alt. 3000 feet {0. S. & F. B. G.); 

 HONDUEAS [Byson i ^ s) ; NiCABAGUA, Chontales [Belt ^% Escondido E. [Bichmond i^), 

 La Libertad in Chontales, Chinandega, and El Volcan Chinandega (W. B. Bich- 

 ardson); Costa Eica, La Palma {Nutting ^% Pacuare, Pozo Azul de Pirris 

 {Zeledon^^); Panama, Bugaba, Mina de Chorcha {Arce% Lion Hill (M'Lean- 

 nan^^}, Chepo (^rc^).— South Ameeica, Colombia 4, Ecuador ^ is i9^ Upper 

 Amazons Valley ^. 



