FAMILY TYRANNIDAE 363 



71. Crown to back uniform dull drab-brown. 



Mouse-colored tyrannulet. Phacomyias iinirina eremonoma. p. 547 

 Back greenish, yellowish, or gray 72 



72. Distinctly crested ; crown reddish cinnamon spotted with black. 



Scale-crested pygmy-tyrant, Lophotriccus pileatus hitcivcntris, p. 529 

 Head not crested ; and not spotted with black Ti 



73. Back light gray ; under surface white to very pale grayish white without 



markings Torrent tyrannulet, Scrpophaga cincrca grisca, p. 544 



Bill relatively large and strongly decurved, especially on the line of the 



culmen (Genus Oncostoma) 74 



Bill straight, not strongly decurved 75 



74. Throat and upper breast yellowish, lined indistinctly with olive-gray. 



Southern bentbill, Oncostoma olwaccum. p. 527 

 Throat and upper breast gray, lined with dull white. 



Northern bentbill, Oncostoma cinercignlare, p. 525 



75. Bill relatively long, broad, and flat 76 



Bill short, with sharply pointed tip 78 



76. Breast gray, streaked lightly with white ; abdomen and under tail coverts 



white to pale yellow. 



Slaty-headed tody-flycatcher, Todirostn(m syhna schistaceiceps, p. 523 

 Breast, abdomen, and under tail coverts bright yellow 77 



77. Crown and hindneck deep black, upper back bright yellowish green, throat 



white Black-headed tody-flycatcher, Todirostrum nigriccps, p. 517 



Only the forecrown black ; rest of upper surface gray to yellowish green ; 

 throat bright yellow. 



Common tody-flycatcher, Todirostrum cincrcum finitimum, p. 519 



78. Lores and narrow line over eye chestnut-brown. 



Rufous-browed tyrannulet, Phylloscartcs super ciJiaris, p. 540 

 Lores and line over eye not chestnut-brown 79 



79. Foreneck and breast white, streaked with dark gray. 



Light-eyed pygmy-tyrant, Atalotriccus pilaris zvilcoxi, p. 532 

 Foreneck not white streaked with dark gray 80 



80. Very small; tail very short, slightly more than half as long as wing.. 81 

 Slightly larger ; tail of normal length, three-fourths or more as long as 



wing 82 



81. Foreneck and breast white to grayish white ; crown black. 



Black-capped pygmy-tyrant, Perissotriccus atricapillus, p. 534 

 Under surface yellow, except for grayish wash on breast. 



Yellow-bellied tyrannulet, Microtriccus brunncicapillus 



hrunneicapillus, p. 582 



82. Lower surface yellow to yellowish white, without definite darker markings 



on breast 83 



Lower surface with slight to heavy grayish wash on breast 84 



83. Lower surface bright yellow ; crown and back olive-green. 



Yellow tyrannulet, Capsicmpis flavcola scmiftava, p. 542 

 Lower surface white to j-ellowish white, above dull grayish green, with 

 crown darker. 



Southern beardless flycatcher, Camptosfoiiia obsolctum, p. 567 



