358 BIRDS OF THE REPUBLIC OF PANAMA PART 3 



13. Chin dusky, this color extended along the jaw on either side. 



Sulphur-bellied flycatcher, Myiodynastcs luteiventris, p. 392 

 Chin white Streaked flycatcher, Myiodynastcs maculatus, p. 395 



14. Body color brown to rufous-brown throughout, darker above, lighter 



below 15 



Body color not uniformly light or rufous-brown throughout 17 



15. Wing coverts dusky or barred with dusky. 



Speckled mourner, Lanioccra rufcscens rufcscens, p. 441 

 Wing coverts rufous-brown, like back 16 



16. Larger, wing 120 mm or more. 



Rufous piha, Lipaugus unirufus unirnfus, p. 446 

 Smaller, wing less than 105 mm. 



Rufous mourner, Rhytiptcrna holcrythra holcrythra, p. 444 



17. With a white, yellow, or buf?y yellow patch on the rump and upper tail 



coverts 18 



With no light-colored patch on the rump 21 



18. Larger, total length 160-180 mm ; body robust ; breast distinctly streaked 



with gray Bright-rumped attila, Attila spadiceus, p. 436 



Smaller, total length 140 mm or less ; body slender, breast without distinct 

 streaks 19 



19. Breast and foreneck grayish brown. 



Lesser black-tailed flycatcher, Myiobins atricaudus, p. 491 

 Breast, lower foreneck, and sides distinctly reddish brown 20 



20. Darker, duller -colored ; abdomen paler, whiter ; larger, length 130-140 mm. 



Greater black-tailed flycatcher, Myiobins villosus villostis, p. 490 

 Brighter colored, more reddish brown on sides ; lower breast and abdomen 

 brighter yellow; smaller, length 115-125 mm. 



Sulphur-rumped flycatcher, Myiobins siilphurcipygius aurcatus. p. 487 



21. Throat white ; rest of under surface yellow 22 



Color of under surface not as above 29 



22. Larger; length more than 190 mm; body heavier, bill stronger 23 



Smaller; length less than 170 mm; body slender, bill smaller 25 



23. Bill large, heavy, with culmen elevated and strongly ridged ; back paler, 



grayer. . . .Boat-billed flycatcher, Mcgarynchus pitangua mexicanus, p. 403 

 Bill of moderate size and form ; back darker 24 



24. Wing coverts, wings, and tail dusky, a white line on black jaw area. 



Golden-bellied flycatcher, Myiodynastcs hcmichrysiis, p. 400 



Wing coverts, wings, and tail strongly rufescent ; no white line on jaw area. 



Great kiskadee, Fitangus sulphuratus guatiuialensis, p. 417 



25. Without a prominent white superciliary line. 



Gray-capped flycatcher, Myiozctctcs granadcnsis, p. 413 

 With a prominent white superciliary line 26 



26. White superciliary lines confluent across forehead, and broadly across 



hindneck.i 



1 In immature Pitangus lictor there is a narrow white band across the hind- 

 neck that is not present in the adult. Birds of this species in the immature stage 

 may be identified by the paler, browner back, and the longer, narrower bill, 

 21.7-25 mm long. In Coryphotricciis the back is blacker, and the bill 19-20 mm. 



