CHERRIE: ORXITHOLOGY OF THi: ORINOCO REGION. 
«. With pale tips to wing-coverts forming 
o. Wing less than 55 mm Tyrannulus elaitis. 
o'. Wing more than 55 mm. 
p. Centre of abdomen bright sulphur 
yellow — crown patch large bordered 
laterally with black or blackish Myiopagis gaimardi gaimar- 
p'. Centre of abdomen pale primrose 
yellow or pale yellowish white. 
q. Feathersof crown elongated. form- [Elaenia martinica fiavogastra. 
ing a crest \Elaenia crislaia. 
q'. Feathers of crown not elongated 
into a crest. 
r. Centre of belly whitish Elaenia albiceps parvirostris. 
r'. Centre of belly pale primrose 
yellow Elaenia chiriquensis chiriquen- 
«'. No wing-bands Myiopagis viridicala viridicata 
m'. Wing more than 80 mm. 
n. Throat nearly uniform yellow with breast Machetornis rixosa ftavigularis 
«'. Throat grey — not uniform with breast. 
o. Crown patch orange yellow Tyrannopsis sulphureus. 
o'. Crown patch scarlet (bordered with 
orange) Tyranntts melancholicus satra- 
pa. 
I'. No concealed or partially concealed crown 
m. Outer webs of outer rectrices pale dirty 
whitish or pale yellowish, 
n. Above greyish olive brown; below, throat 
greyish white, belly pale primrose yellow. Xenopsaris albinucha. ' 
«'. Above dusky olive, below sulphur yel- 
low with a buffy wash on the breast Inezia caudata . 
m'. Outer webs of outer rectrices not con- 
spicuously lighter colored than the inner 
H. Bright olive green above. 
o. Pileum slate grey in marked contrast 
with oUve green of back. 
p. Larger; tail about equal to wing 
(Trinidad) Leptopozon superciliaris. 
p'. Smaller; tail less than wing Todirostrum schislaceiceps. 
o'. Pileum not slate grey, or if grey or 
dusky not in sharp contrast with olive 
greenish back. 
[Piprojnorpka oleagiJieus olea- 
p. Abdomen bright tawny olive Ir^^^"^^', 
\Ptpromorpna oleagtneus path- 
p'. Abdomen not tawny olive. 
g. Throat distinctly grey rather than 
yellow or oUve yellow Ornithion pusillum napaeum. 
q'. Throat yellow or yellowish olive. 
r. A distinct yellow or yellowish 
superciliar\- streak Capsieynpis flaveola. 
r'. No superciliary stripe. 
s. Throat and breast olive 
/. Mandible blackish hom- 
color, whitish at base only. . Rhynchocydus sulphu 
t'. Mandible nearly uniform 
from tip to base (pale dusky 
horn-color.) 
u. Darker, pileum and hind 
neck deep slate color RJiynchocydus i 
u'. Paler, pileum and hind- 
neck slate grey RJiynchocydus siflpkurescens 
sulphur escens. 
s'. Throat" and breast chrome or 
lemon yellow with a faint 
ochraceous wash Rhynchocydus fiaviventris fla- 
«'. Not bright olive green above. 
^This is out of place here, as Xenopsaris belongs \ 
