CHERRIE : ORNITHOLOGY OF THE ORINOCO REGION. 285 



HERPSILOCHMUS RUFIMARGINATUS PRATER Sclater & Salvin. 

 Herpsilochmus f rater 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- 4 2 4 (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 s. 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-fumosus 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 3Oth and August 2nd. 



MiCRORHOPiAs 1 ORENOCENSIS (Hellmayr). 



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

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



Formicivora intermedia Berlepsch & Hartert, p. 75. 



Abundant along the Middle 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. 



l Microrhopias rufa. 



MyiotherarufaWied, Beitr. Naturg. Bras..iii., p. IOQS. 1831. (Bahia). 



Fvrmicivora rufatra Sclater, Cat. Birds Brit. Mus. XV. 1890. p. 251 (Orinoco?) Recorded from the 

 Orinoco, with a query by Sclater. 



