14 TTEAJSfNID^. 



were described by Mr. Sclater under this name. The species was soon after found by 

 us in the forests of the basin of the Eio de la Pasion, in northern Vera Paz, and it has 

 since been traced to Tehuantepec, Tabasco, and British Honduras. It occurs again on 

 tlie banks of the San Juan del Norte river, in Nicaragua, and on the line of the Panama 

 Eailway. Mr. Zeledon includes its name in his list of Costa Eica birds, but has not 

 yet stated in what part of that country it is found ^^. The bird from the mainland of 

 South America has been separated by Mr. Lawrence as T. swperciliaris on the ground 

 of the under surface being rather whiter, and the white lores extending further over the 

 eye i^. These diflFerences are indeed slight, and hardly of specific value in our opinion. 



ONCOSTOMA. 



Oncostoma, Scl. Ibis, 1862, p. 12; Cat. Am. Birds, p. 208; Cat. Birds Brit. Mus. xiv. p. 76. 



Only two species are known of this curious form — one from Southern Mexico and 

 Central America, as far south as the Volcan de Chiriqui in the State of Panama, the 

 other peculiar to the isthmus itself along the line of railway. 



The two species of this genus are olive-green above, greyish below, with the abdomen 

 yellow, and thus resemble such members of the genus Todirostrum as T. schistaceiceps. 

 But Oncostoma has several important differences. The bill is strongly arched, the 

 culmen still more so, giving the bill a very different outline from that of Todirostrum, 

 which is flat, and the culmen nearly straight ; the tail is composed of narrow feathers, 

 but is not nearly so rounded ; the proportions of tail, wings, and tarsi are much as in 

 Todirostrum. 



1. Oncostoma ciuereignlare. 



Todirostrum cinereigulare, Scl. P. Z. S. 1856, p. 295 '; 1859, p. 384°. 



Oncostoma cinereigulare, Scl. Cat. Am. B. p. 208, t. 18. f. 1"; Cat. Birds Brit. Mus. xiv. p. 77*; 



Salv. Ibis, 1866, p. 194'; P. Z. S. 1870, p. 196'; Lawr. Ann. Lye. N. Y. ix. p. Ill'; 



Bull. U. S. Nat. Mus. no. 4, p. 26 ' ; Sumichrast, Mem. Bost. Soc. N. H. i. p. 557 ' ; Boucard, 



P. Z.S. 1883, p. 447". 



Olivaceum ; capite summo vix saturatiore ; alis et cauda fasco-nigrioaHtibus, extrorsTun olivaceo limbatis ; capitis 

 lateribus et gutture toto cinereis, lioc albicante striolato ; abdomine medio flavicante : rostro corneo ; pedibus 

 pallide corylinis. Long, tota 4-0, alse 2-0, caudse 1'6, rostri a rietu 0-55, tarsi 0*6. (Desor. exempl. ex 

 Coban, Guatemala. Mus. uostr.) 

 5 mail similis. 



Eab. Mexico, Cordova {SalU^), hot region of Vera Cruz (Sumichrast^), Teotalcingo 

 and Playa Vicente (Boucard ^), Guichicovi, Cacoprieto, Tapana, Sta Efigenia (Sumi- 

 chrast ^%Tizimin^ and Peto in Yucatan (Gaumer) ; British Hoitduras, Orange 

 Walk (Gaumer) ; Guatemala, Coban s, Teleman, Choctum, Savana grande, Volcan 

 de Agua above San Diego, Eetalhuleu (0. S. & F. D.G.); Costa Rica, Angostura 

 (Carmiol '') ; Panama, Bugaba (Arci ^). 



