BROOKLYN INSTITUTE MUSEUM. SCIENCE BULLETIN 2. 6. 
Under parts not streaked. 
i. Underpartsbright red (adult cf) Pyrocephalus rubinus sattira- 
{'. Under parts not bright red. 
e. Throat, middle of breast and betly nearly uniform white or 
very pale greyish white. 
/. Wing more than 90 mm Tyraiuins dominicensis. 
/'. Wing less than 90 mm. 
g. Wings and tail black (with or without white markingsl. 
h. Both maxilla and mandible black to the base; rectrices 
tipped with white Fluvicola pica. 
h'. Mandible pale at base; rectrices not white tipped (fe- 
male) Arundinicola leticocephala. 
g'. Wings and tail dusky brownish or blackish Serpophaga hypoleuca. 
e'. Throat, middle of breast and belly not uniform white or very 
pale greyish white. 
/. General color above and below black or slate black. 
g. Head white (male) Arundinicola leucocephala. 
g'. Head not white. 
h. Outer primaries acuminate Knipolegns Pusillus. 
h'. Outer primaries not acuminate Knipolegns orenocensis. 
I ' General color above and below not black or slate black. 
s- A prominent white or yellow superciliary stripe and wing 
more tlian 70 mm. 
h. Superciliary stripe white. 
t. Bill less than 15 mm. from the nostrils to the tip. 
j. No bright colored crown patch Conopias inornata. 
j'. With a bright cblored crown patch. 
k. Inner webs of wing-quills edged (broadly) with 
rufous Myiozetetes cayeiuirnsis cay- 
k*. Inner webs of wing-quills nol edged with rufous . . Myiozetetes texeyisis cohttn- 
bianus. 
i'. Bill more than 1 5 mm. from the nostrils to the tip. 
j. Smaller; wing less than lOO^m Pitangus lictor. 
j'. Larger; wing more than 100 mm. 
k. Culmenstronglydecurved from base to tip Megarhynckus pilangna pitan- 
k'. Culmen straight, sharply bent at tip only. 
/. Inner webs of tail-feathers almost entirely 
rufous Pitangus sulpkuratus rufipen- 
l'. Inner webs of tail-feathers edged (only) with 
rufous— that color not extending to the shafts 
of the feathers Pitangus sulpkuratus Innitalis 
/('. Superciliary stripe yellow (and wing more than 70 mm.) Sisopygis iclerophrys. 
a'. No prominent white or yellow superciliary stripe, or wing 
less than 70 mm. 
h. Rump yellow. 
r. Yellow of under parts suffused with fulvous, and 
olive green of back less intense Myiobius modestus. 
t'. Yellow of under parts brighter, not suffused with 
fulvous, and back deep rich olive green Myiobius barbatus barbatus. 
h'. Rump not yellow. 
/. Width of bill at nostrils equal to or greater than dis- 
tance from the nostrils to the tip of the bill. 
7. Coronal patch red; general color above rich oHve 
brown, darker on the head Plalytriccus salnratus. 
j'. Without coronal patch, general color above dark 
olive green Craspedoprion intermedins. 
i'. Width of bill at nostrils not equal to distance from 
the nostrils to the tip of the bill. 
j. Outstretched feet reaching to or beyond the end of 
the tail. 
k. Tail more than half as long as wing Todirostrum cinereuni ciner- 
k'. Tail less than half as long as wing Perissotriccus ecaiidatus. 
j'. Outstretched feet not reaching to the end of the 
tail. 
k. The three or four outer primaries much reduced 
/. With a well developed crest — three outer 
primaries reduced Cohpteryx galeatus. 
r. Not crested — four outer primaries reduced Atalotriccus pilaris venezue- 
k'. Outer primaries not greatly reduced in size. 
I. A more or less prominent sometimes concealed 
or partially concealed crown patch. 
m. Smaller, wing less than 80 mm. 
