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. ruficollis, only reaching the Isthmus of 
Darien. None of the species are peculiar to our region. 
1. Bucco dysoni. | 
Bucco dysoni, G. R. Gray in Mus. Brit.*; Scl. P. Z. S. 1855, p. 193°; Mon. Jacamars and Puff- 
birds, p. 67, t. 21°; Cat. Birds Brit. Mus. xix. p. 182*; Sel. & Salv. Ibis, 1860, p. 40°; 
P.Z. 8. 1864, p. 363°; Lawr. Ann. Lyc. N. Y. vii. p. 3187; Bull. U. 8. Nat. Mus. no. 4, 
p. 80°; Salv. P. Z.S. 1870, p. 201°; Ibis, 1872, p. 8322”; Cat. Strickl. Coll. p. 429''; 
Sumichrast, La Nat. v. p. 239"°; Nutting, Pr. U. 8. Nat. Mus. v. p. 401"; Zeledon, An. 
Mus. Nac. Costa Rica, 1887, p. 120“; Richmond, Pr. U. 8. 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 alis et tectricibus suis stricte albo fimbriatis, interscapulio et capite summo 
immaculatis ; fronte, superciliis, gutture toto, tectricibus auricularibus, torque cervicali et abdomine albis, 
loris cum stria postoculari et torque subpectorali nigris, hypochondriis albis nigro transfasciatis ; cauda 
nigricante; rostro nigro, pedibus plumbeis. Long. tota 10-0, ale 4°6, caudex 3°45, rostri a rictu 1:9, 
tarsi 0°85. (Deser. maris ex Escuintla, Guatemala. Mus. nostr.) 
@ mari omnino similis. 
Hab. Mexico, Santa Efigenia*®!* and Tapanatepec * in Tehuantepec (Sumichrast) ; 
British Honpuras, Cayo (Blancaneaux) ; GuateMaLa (mus. Strickland ™), Forests 
of Northern Vera Paz, above Escuintla, alt. 3000 feet (0. S. & F. D. G.); 
Honpuras (Dyson 12°); Nicaracua, Chontales (Bel¢ 1°), Escondido R. (Richmond »), 
La Libertad in Chontales, Chinandega, and El Volcan Chinandega (W. B. Rich- 
ardson); Costa Rica, La Palma (Nutting }°), Pacuare, Pozo Azul de Pirris 
(Zeledon 1*); Panama, Bugaba, Mina de Chorcha (Arcé®), Lion Hill (M*‘Lean- 
nan®7), Chepo (Arcé).—Sourn America, Colombia‘, Ecuador 41819, Upper 
Amazons Valley 4. 
