CHERKIE; ORNITHOLOGY OF THE ORINOCO REGION. 285 



Herpsilochmus rufimarginatus frater Sclater & Salvin. 

 Herpsilochmus frater Scl. & Salv., P. Z. S. 1880. p. 159. 



Herpsilochmus rufimarginatus frater Berlepsch & Hartert, p. 75. 



Not observed on the Orinoco, but recorded from Suapure on the 

 Caura River. In the American Museum collection is an adult male from 

 . that point. 



Herpsilochmus sticturus sticturus Salvin. 



Herpsilochmus sticturus Salvin, Ibis 1885. p. 424 (Bartica Grove, 

 British Guiana). 



In the American Museum collection is a specimen from Boca de 

 Sina, Cunucunuma River, Upper Orinoco. 



Herpsilochmus sticturus nigrescens Todd. 

 Herpsilochmus sticturus nigrescens Todd, Proc. Biol. Soc. Wash. 



XXVIII. 1915, 80 (Type ex Maripa, Rio Caura, Venez.). 



I have not seen this race, that is said to differ from .y. sticturus in 

 having a greater admixture of black above and "under parts much 

 darker, more grayish, the throat and breast indistinctly striped with 

 dusky grayish and white." 



MiCRORHOPiAS CANo-FUMOsus (Cherrie). 

 Formicivora cano-fumosiis Cherrie, Sci. Bull. Bklyn. Inst. Mus. I. 1909, 



p. 387. (Type, $ , ex Las Barrancas, Delta reg., Orinoco River, 



Venez.). 



Observed and taken only in the type locality, where three males 

 and three females were collected between July 30th and August 2nd. 



MiCRORHOPiAS^ oRENOCENsis (Hellmayr). 

 Formicivora orenocensis Hellmayr, Bull. Br. Orn. CI. XIV. 1904. 54 

 (Type, $ ad: ex. Altagracia, Orinoco River, Venez.) 



Formicivora intermedia Berlepsch & Hartert, p. 75. 



Abundant along the ]\Iiddle Orinoco from Cuidad Bolivar to 



Caicara. Keeps chiefly to the low thickets in heavily timbered 

 regions. 



Eye seal brown ; bill above black, below slate color ; feet slate color. 



^Microrhopias rufa. 



Myiotherarufa Wied. Beitr. Naturg. Bras., iii., p. 1095, 1831, (Bahia'). 



Formicivora rufatra Sclater, Cat. Birds Brit. Mus. XV. 1890. p. 2Si (Orinoco?) Recorded from the 

 Orinoco, with a query by Sclater. 



