HELMITHERUS. 



179 



Helminthophaga per. Cab. Mus. Hein. — Ib. Jour. Orn. 1861. 85 

 (Costa Rica). — Baikd, Birds N. Am. 1858, 258. — Sclater & Salvin, 

 Ibis, 1860, 31 (Guatemala).— Sclater, P. Z. S. 1859, 373 (Oaxaca) ; 

 Catal. 1861, 29, no. 180.— Lawrence, Ann. N. Y. Lye. 1861, 322 

 (Panama). — Gundlach, Cab. Jour. 1861, 326 (Cuba, very rare). 



Sylvia tennesscei, Vieillot, EncycL Meth. II, 1823, 452. 



?Si/lvia missuriensis, Max. Cab. Jour. VI, 1858, 117. • 



Hah. Eastern province of N. America : North to Fort Simpson, H. B. T. ; 

 Mexico ; Oaxaca ? Guatemala ; Costa Rica ; Panama R. R. .Very rare in Cuba. 



Autumnal specimens and young birds are sometimes so strongly 

 tinged with greenish-yellow as to be scarcely distinguishable from 

 H. celata. The wing is, however, always longer, and the obscure 

 whitish patch on the inner edge of the exterior tail feather, near its 

 tip, is almost always appreciable. In celata this edge is very nar- 

 rowly and uniformly margined with whitish. 



A young bird of the year, from Fort Simpson (27,228), has two 

 distinct greenish-white bands on the wings, and the forehead and 

 cheeks greenish -yellow. A corresponding age of H. celata has the 

 wing bands more reddish-brown, the wings shorter, and no white 

 patch on the outer tail feather. 



It is possible that Mr. Sclater is mistaken in quoting this species 

 from Oaxaca, the only Mexican locality mentioned by authors. 



HELMITHERUS, Raf. 



Eelmitherus, Raf. Jour, de Phys. vol. 88, 1819, 417. (Type Motacilla 



vermivora, Lath.) 

 Vermivora, Swainson, Zool. Jour. IV, 1827, 170. 

 Helinaia, AuD. Syn. 1839, 66. (Type Sylvia swainsoni, Add.) 



Heliuitlieriis vermiTorus. 



Motacilla vermivora, Gmel. Syst. Nat. I, 1788, 951. — fSylvia vermivora 

 Lath. Ind. Orn. II, 1790, 499.— Wils. Ill, pi. xxiv, fig. 4.— Aud.' 



