Carriker : List of the Birds of Costa Rica. 571 



DICRORHYNCHUS * genus nov. (Capitomda.) 



Related to Semnornis Richmond, but differing in having the maxilla 

 much less swollen basally, and of the same color as the remainder of 

 the bill ; with the maxillary ridge narrower and sharper and with the 

 nasal slit less pronounced ; with the color pattern of the whole body 

 very different, having none of the vivid and contrasted colors of 

 Semnornis, but plainly and uniformly colored both above and below. 



Type. — Tetragonops frantzii Sclater. 



303. Dicrorhynchus frantzii (Sclater). 



Tetragonops frantzii Sclater, Ibis, 1864, 371, 10 (Costa Rica [Frantzius]). — 

 Frantzius, Ibis, 1865, 551 (Birds, Costa Rica); Jour, fur Orn., 1869, 363 

 (Quebrada Honda, La Palma, Cervantes). — Lawrence, Ann. Lye. N. Y., 

 I X, 1868, 130 (San Jose [Frantzius], Cervantes [J. Carmiol]. Navarro [Cooper], 

 Birris and La Palma [Zeledon]). — Boucard, P. Z. S., 1878, 47 (Navarro). — 

 Zeledon, An. Mus. Nac. de C. R., I, 1887, 123 (Cervantes). — Shelley, 

 Cat. Birds Brit. Mus., XIX, 1891, 121 (Irazu district [Rogers], Navarro 

 [Cooper]). — Salvin and Godman, Biol. Centr.-Am., Aves, II, 1896, 550 

 (Costa Rican references). 



Semnornis Richmond, Auk, XVII, 1900, 179 (new name for Pan Richmond 

 [vice Tetragonops Jardine] preoccupied; type Tetragonops rhamphastinus) . 



U. S. Nat. Museum : Burgos de Irazu, Carrillo, La Estrella de Car- 



tago (Castro) ; Coli bianco (Ridgway). 

 Bangs Collection : Azahar de Cartago, Volcan de Irazu (Underwood). 

 C. H. Lankester Collection : Cariblanco de Sarapiqui. 

 Carnegie Museum: La Hondura (Carriker). Nine skins. 



This peculiar species is distributed over the higher parts of the 

 Caribbean slope and along the eastern edge of the plateau region, 

 from about 1,200 feet up to perhaps 6,000 feet. They are most 

 abundant between 2,000 and 4,000 feet, usually move in small bands, 

 though often alone, and has a very peculiar call, resembling that of 

 a gallinaceous bird. It inhabits the heavy forest, and seems partial 

 to the borders of creeks, where it is almost always found rather low 

 down in the trees. 



Family RHAMPHASTID^E. 

 Key to the Costa Rican Species. 



a. Throat yellowish; breast and abdomen black; under tail-coverts red. 



b. Bill larger (adult, 150 to 180 mm.); apical half of maxilla and basal portion 

 above bright yellow; sides of maxilla at base and basal portion of man- 

 dible blood-red. Rhamphaslos tocard $ , 9 • 



* (dlicpooc, bifurcate ; pvyx°C bill). 



