CHERRIE: ORNITHOLOGY OF THE ORINOCO REGION. 2O3 
<f. 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. 
€. Upper parts bright olive yellowish; wings blackish with pale 
quill edges and tw^o wing-bars formed by pale tips of greater 
and middle coverts Icterus xanlkornus xanlhor- 
nus (Juvenal). 
«'. Head yellow; back, wings and tail black Gymnomyslax mexicanus. 
d'. Throat not uniform with remaining under parts. 
e. Lower back and crissum chestnut Gymnoslinops yuracares 
(/. No chestnu 
/. Throat yellow Xanthosomus iclerocephalus. 
f. Throat black. 
g. Head all around black Icterus icterus. 
g'. Top of head yellow uniform with back Icterus xanthornus xanthor- 
nus (adult). 
Gymnostinops yurac.\res caurensis Todd. 
Cassiciis xttracairs Lafr. & D'Orb.. Svn. Av. H. p. 2 : in Mag. Zool. VHI. 
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 -Muller, 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. 
