CHERRIE: ORXITHOLOGY OF THE ORIXOCO REGION. 213 
chestnut, the darker markings overlying the others. Ovate in form, 
the eggs measure 32.5x24.5: 33.25x24; 34x24; 33x24.25 and 32.5 x 
24 mm. respectively. 
Cyanocor.\x c.\v.\nus (Linnaeus). 
CorvHS cayaiiiis L., Syst. Nat. ed. 12. I. 1766. p. 157. 
Cyanocorax cayanns Berlepsch & Hartert, p. 34. 
According to Berlep-sch and Hartert. Klages obtained specimens at 
Suapure and Andre at La Pricion on the Caura. None were observed 
by the writer on the Orinoco proper. 
TYRANNIDAE— THE TYRANT-FLYCATCHERS, KINGBIRDS. 
Sixty-nine species and subspecies of Flycatchers are included in the 
present list. Several, however, such as Ornithion inerme, Tyrannulus ela- 
tus, Myiopagis viridicata viridicata, M. gaimardi, M. flovivertex, and 
M. cinerea might better be placed with the Cotingidae. But as they were 
included in my original "key" to the flycatchers they are so retained. 
Many of the flycatchers are conspicuous in the llanos districts of 
the Orinoco region, conspicuous alike for their harsh cries, their brilliant 
colors (particularly bright yellows) and extraordinary nesting habits. 
As nest builders they have few rivals, certain species constructing deli- 
cate lichen covered affairs as tiny and trim as those of some humming 
birds, others whose nests might serve as models for the weaver-birds, 
and again the great bulky grass nests, such as those of Pitangtis, placed 
in the tree tops are prominent objects in the landscape. But not all are 
birds of the open llanos, many are quiet and retiring both in dress and 
disposition. These must be sought for in the semitwilight of the thick 
forest where they flit about, as silent as the shadows, in the under- 
growth. 
Key to the Gener.\, Species .\nd Subspecies of Tvranxid.ae. 
a. Tail very long and deeply forked Mtisciwra tyramius. 
a'. Tail not unusually long or deeply forked. 
6. Chest barred with olive brown Onychorhynchus coronatus 
b'. Chest not barred. 
c. Under parts more or less streaked with dusky or blackish. 
d. Wing less than 60 mm Todirostrum tnaculatum. 
d'. Wing more than 60 mm. 
c. A well marked black or blackish auricular stripe. 
/. Inner web of tail-feathers broadly edged with rufous Myiodynasles maculatits macii- 
/'. Inner webs of tail-feathers not broadly edged with rufous, 
g. Upper tail-coverts broadly edged with rufous; inner webs 
of tail feathers nof edged with rufous Empidonomus varius. 
g'. Upper tail-coverts not edged with rufous; inner webs of 
tail-feathers narrowly edged with rufous Legatus albicoUis. 
«'. No black or blackistfauricular stripe ( cT im. or 2 ) Pyrocephalus ruhimis salura- 
