214 BROOKLYN INSTITUTE MUSEUM. SCIENCE BULLETIN 2. 6. 



c' . Under parts nol streaked. 



d. Under parts bright red (adult cf ) Pyrocephalus rubinus satura- 



tus. 

 d'. Under parts nol bright red. 



e. Throat, middle of breast and belly nearly uniform white or 

 very pale greyish white. 



/. Wing more than 90 mm Tyrannus dominicensis. 



f. Wing less than 90 mm. 



g. Wings and tail black (with or without white markings). 

 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 leucocephala. 



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 Knipolegus pusillus. 



h'. Outer primaries not acuminate Knipolegus orenocensis. 



I'. General color above and below not black or slate black, 

 e- A prominent white or yellow superciliary stripe and wing 

 more than 70 mm. 

 h. Superciliary stripe white. 



1. Bill less than 15 mm, from the nostrils to the tip. 



j. No bright colored crown patch Conopias inornata, 



j'. With a bright colored crown patch, 



k. Inner webs of wing-quills edged (broadly) with 



rufous Myiozetetes cayennensis cay- 



ennensis. 

 k'. Inner webs of wing-quills Moi edged with rufous., Myiozetetes lexensis colum- 



bianus. 

 i'. Bill more than IS mm. from the nostrils to the tip. 



j. Smaller; wing less than 100 mm Pilangus lictor. 



j'. Larger; wing more than 100 mm. 



k. Culmen strongly decurved from base to tip Megarhynchus pilangua pitan- 



gua. 

 k'. Culmen straight, sharply bent at tip only, 



I. Inner webs of tail-feathers almost entirely 



rufous Pitangus sutphuralus rufipen- 



nis. 

 I'. Inner webs of tail-feathers edged (only) with 

 rufous — that color not extending to the shafts 



of the feathers Pitangus sulphiiralus trinitatis 



h'. Superciliary stripe yellow (and wing more than 70 mm.) Sisopygis icterophrys. 

 n'. No prominent white or yellow superciliary stripe, or wing 

 less than 70 mm, 

 h. Rump yellow, 



i. Yellow of under parts suffused with fulvous, and 



olive green of back less intense Myiobius modeslus. 



i'. Yellow of under parts brighter, not suffused with 



fulvous, and back deep rich olive green Myiobius barbatus barbatus. 



h'. Rump not yellow. 



I. Width of hill at nostrils equal to or greater than dis- 

 . tance from the nostrils to the tip of the bill, 

 j. Coronal patch red; general color above rich olive 



brown, darker on the head Platylriccus saluratus. 



j'. Without coronal patch, general color above dark 



olive green Craspedoprion intermedius. 



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 cinereum ciner- 



eum. 



k'. Tail less than half as long as wing Perissotriccus ecaudatus. 



j'. Outstretched feet nol reaching to the end of the 

 tail, 

 k. The three or four outer primaries much reduced 

 in size. 

 /. With a well developed crest — three outer 



primaries reduced Colopteryx galeatus. 



I'. Not crested — four outer primaries reduced ... . Atalotriccus pilaris venezue- 



lensis. 

 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. 



