CHERRIE: ORNITHOLOGY OF THE ORINOCO REGION. 2O3 



cf. If throat is uniform with breast and sides then general color of 



under parts is neither black nor brown. 

 d. Throat uniform with remaining under parts. 

 e. Upper parts bright olive yellowish; wings blackish with pale 

 quill edges and two wing-bars formed by pale tips of greater 



and middle coverts '. Icterus xanthornus xanlhor- 



nus (Juvenal). 



e'. Head yellow; back, wings and tail black Gymnomystax mexicanus. 



d'. Throat not uniform with remaining under parts. 



. Lower back and crissum chestnut ' Gymnostinops yuracares 



caurensis. 

 e'. No chestnut in plumage. 



/. Throat yellow Xanthosomus icterocephalus. 



f. Throat black. 



g. Head all around black Icterus icterus. 



g f . Top of head yellow uniform with back Icterus xanthornus xanthor- 

 nus (adult). 



GYMNOSTINOPS YURACARES CAURENSIS Todd. 

 Cassicus yuracares Lafr. & D'Orb., Syn. Av. H. p. 2 ; in Mag. Zool. VIII. 



1838. 



Gymnostinops yuracares Berlepsch & Hartert, p. 30. 

 Gymnostinops yuracares caurensis Todd; Proc. Biol. Soc. Wash. XXVI, 



1913, 170 (Rio Mocho, Rio Caura, Venez.). 



The Tring Museum received specimens collected on the Caura 

 River, at Suapure by Klages, and at Nicare by Andre. None were 

 seen on the Orinoco proper by the writer. 



OSTINOPS DECUMANUS (Pallas). 



Xanthornus decumanus Pall., Spic. Zool. Fasc. VI. 1769. p. i. 

 Ostinops decumanus Berlepsch & Hartert, p. 30. 



This species seemed to be confined to the heavily wooded regions 

 above the falls in the Orinoco and the equally heavy forests of the 

 delta region. It was not observed by the writer anywhere below the 

 mouth of the river Meta. A number of trees in the vicinity of Maipures 

 and Munduapo were conspicuous by the number of long nests of this 

 species swinging from their branches. 



Beebe collected a female at Guanoco in the delta region. 



OSTINOPS VIRIDIS (Miiller). 



Oriolus viridis Miiller, Natursyst. Supplement, 1776. p. 87. 

 Ostinops viridis Berlepsch & Hartert, p. 30. 



Klages sent a specimen from the Mato River mouth (on the Caura 

 River) to the Tring Museum and Andre sent one from Nicare. It was 

 not observed by the writer. 



