222 TYRANNID.E. 



6''. Flanks and crissum whitish. 



i Larger ; browner above 3. bimaculatus, p. 224. 



| Smaller ; more olivaceous above. . 4. oliva, p. 224. 

 b'. Upper surface olive, olive-greenish, or 

 greyish, 

 c". Lower surface not distinctly yel- 

 lowish. 

 a 3 . First quill shorter than ninth . . 5. yrisei])ectus, p. 225. 

 b 3 . First quill longer than seventh. 

 fl'. Tail even or slightly rounded ; 

 size larger. 

 « 5 . Outer web of outer rectrix 

 not paler : 

 f less olivaceous above, and 



less yellowish beneath 6. pusittus, p. 225. 

 <( more olivaceous above 

 and more yellowish 



L beneath 7. trailli, p. 226. 



¥. Outer web of outer rectrix 



abruptly pale 8. ridgwayi, p. 227. 



6 4 . Tail slightly emarginate ; size 



smaller 9. minimus, p. 227. 



c 3 . First quill equal to or longer than 



fifth 10. acadicus, p. 228. 



d' '. Lower surface distinctly yellowish. 



c 4 . Under wing-coverts pale buff 11. difficilis, p. 229. 

 d*. Under wing-coverts yellowish 

 white. 

 e 5 . Wing-bands not darker than 



lower surface 12. Jlaviventris, p. 230. 



d''. Wing-bands darker than 

 lower surface. 



a 6 . Above dull olive 13. bairdi, p. 230. 



b s . Above bright olive : 



{beneath greenish yel- 

 low 14. salvini, p. 231. 

 beneath bright yellow. 15. jiavescens, p. 231. 

 B. Width of bill at nostrils less than half the 

 length of the exposed cidmen. 



c. Outer web of outer tail-feather not ab- 



ruptly paler 16. hammondi, p. 232. 



d. Outer web of outer tail-feather abruptly 



paler 17. obscurus, p. 232. 



1. Empidonax fulvifrons. 



Muscicapa fulvifrons, Giraud, B. of Texas, pi. 2. fig. 2. 



Empidonax fulvifrons, Sclater, P. Z. S. 1858, p. 301 ; Ridgivcty, Ibis, 



1886, p. 462 ; id. Man. N. A. B. p. 344. 

 Mitrephorus fulvifrons, Sclater, P. Z. S. 1859, p. 45 ; id. Ibis, 1859, 



p. 442 ; id. Cat. A. B. p. 228. 

 Empidonax rubicundus, Cab. et Hein. Mus. Hein. ii. p. 70. 

 Empidonax fulvifrons rubicundus, Iiidyio. Ibis, 1886, p. 463 ; id. Man. 



N. A. B. p. 345. 

 Mitrephorus pallescens, Cones, Pr. Ac. Sc. Phil. 1866, p. 63 (Arizona). 

 Mitrephanes fulvifrons pallescens, Coues, Key N. A. B. 1884, p. 443. 



