CHERRIli: ORNITHOI^OGY OF THE ORINOCO REGION. 251 
I. Above dull olive with head more or less rufescent. . . Pachyrkamphus marginatus. 
>■'. Head uniform with back (not rufescent) Pachyrkamphus pdychroplerus 
niger. 
/'. Rectrices not broadly tipped with white, buff or rufous, 
g. Pileum black, blackish or grey, sharply contrasting 
with general color of the upper parts. 
h. Above grey, with or without slight olive wash (male) Pachyrkamphus cincreus. 
h'. Above tawny olive Pachyrkamphus marcidus. 
g'. Pileum cinnamon rufous nearly uniform with back (female).. Pachyrkamphus cinereus. 
a'. Tarsus neither pycnaspidean nor essentially taxaspidean. 
b. Upper posterior portion of tarsus (near heel joint) conspicuously ser- 
rate, and basal phalanx only of middle toe adherent, for most of its 
length, to the outer toe Lipaugus immundus. 
b'. Upper posterior portion of tarsus not conspicuously serrate, and the 
middle and outer toes adherent for more than the length of the basal 
phalanx- of the middle toe 4//iVa wighli.^ 
TiTYRA CAYANA (Liniiaeus). 
Lanhis cayanus L., Syst. Nat. ed. 12. I. 1766. p. 137. 
Tityra cayana Berlepsch & Hartert, p. 55. 
Xot common. In ascending the Orinoco this species was noted at 
various points from Caicara to above the second falls at Maipures, on 
the upper river. A female collected at Caicara July 3, 1907, was evi- 
dently nesting as the ovaries were active. 
Erator inquisitor erythrogenys (Selby). 
Psaris erythrogenys Selby, Zool. Journ., II. 1826. p. 483. 
Tityra inquisitor erythrogenys Hellmayr, Novit. Zool. XIII. 1906. pp. 
327-8 (Rio Cataiiapo, Perico, Maipures, Orinoco River, Venezuela). 
Tityra erythrogenys Berlepsch & Hartert. p. 55 (Perico, Rio Cataiiapo, 
Maipures, Orinoco River). 
On my first expedition this species was not observed below the 
Falls of .\tures, but on the last two expeditions it was not uncommon 
about Caicara. 
Eye seal brown ; bill, maxilla black with slate grey l>asal cutting 
edges, mandible slate grey; feet dusky slate. 
Platypsaris minor (Lesson). 
Querula minor Less., Tr. d'Orn. I. 1831. p. 363. 
Hadrostomtis minor Berlepsch & Hartert, p. 56 (Suapure, Caura River, 
Venezuela). 
This species was included in the Berlepsch and Hartert paper, the 
Tring Museum having received a specimen from the Caura River. It 
was not seen by me on the Orinoco proper. 
The American Museum collection contains specimens from the 
Caura, received from Klages. 
