362 BIRDS OF THE REPUBLIC OF PANAMA PART 3 



59. Lower surface white to very faintly yellow 60 



Lower surface wholly or partly light yellow to strongly yellow 63 



60. Sixth primary with outer web definitely narrowed, sinuated on outer end ; 



slightly smaller ; wing 59-67 mm. 



Least flycatcher, Einpidonax minimus, p. 468 



Sixth primary with outer web slightly if at all narrowed or sinuated ; 



larger wing, more than 70 mm 61 



61. Distinctly greenish gray above; with a prominent white eye-ring; breast 



band less strongly marked. 



Acadian flycatcher, Empidonax virescens. p. 465 



Browner, less greenish, more olive above ; band on breast more definitely 



marked 62 



62. Dorsal surface dark olive-green, with a distinct greenish cast. 



Alder flycatcher, Empidonax alnorum, p. 473 

 Dorsal surface browner, with little or no greenish cast. 



Traill's flycatcher, Empidonax traillii, p. 475 



63. Larger, length more than 115 mm 64 



Smaller to very small, length 110 mm or less 70 



64. Above yellowish green ; lower surface deep yellow, more or less bufify 



across breast ; a prominent white eye-ring. 



Yellowish flycatcher, Empidonax flaz'csccns flavcsccns, p. 469 

 Above duller, less yellowish green ; breast and abdomen lighter yellow ; eye- 

 ring absent or less prominent ; larger, length 120 mm 65 



65. Darker, more olive-green above; edgings on wings nearly or entirely white; 



throat more yellowish white. 



Yellow-bellied flycatcher, Empidonax flavivcntris, p. 463 

 Lighter green on back ; wing edgings buff or greenish white 66 



66. Back and crown closely similar, somewhat more buffy green ; lower sides 



and flanks yellow, with the dark breast band sharply different from yellow 



lower breast Black-billed flycatcher, Praedo audax, p. 485 



Crown of dififerent shade than the back ; chin in general similar to 

 foreneck 67 



67. Bill broader, with mandible lighter in color ; crown grayer ; back and 



tail edgings lighter green 68 



Bill slender, blacker ; crown blacker than back 69 



68. Light greenish gray above, and on breast ; especially on the head, and 



edging on tail ; tail slightly shorter. 



Yellow-margined flycatcher, Tolmomyias assimUis flavotcctus, p. 510 

 Darker green above ; breast and foreneck slightly greenish gray ; tail slightly 

 longer. 

 Yellow-olive flycatcher, Tolmomyias sulphnrcsccns flavo-olivacctis, p. 508 



69. Crown blackish brown ; forehead, lores, and auricular region duller, browner. 



Sepia-capped flycatcher, Lcptopogon amanroccphalus, p. 585 

 Crown somewhat greenish black ; side of forehead, lores, and auricular 

 region mixed dull black and white. 



Slaty-capped flycatcher, Lcptopogon super ciliaris, p. 589 



70. Very dark, blackish brown on upper surface ; sides, under tail coverts, 



and prominent breast band dark brown. 



Olive-crowned pygmy-tyrant, Pscudotriccns pchclni bcrlcpschi, p. 537 

 Dorsal surface lighter colored, gray or greenish to light brown 71 



