Todd — Studies in the Tyrannidce. 21 



b'. Rump and under parts (posteriorly) Martins yellow, the 

 breast more or less shaded with citrine, the throat deep 



colonial buff ..Myiobius barbatus. 



h". Rump and under parts pale lemon yellow, the breast and 

 sides shaded with pyrite yellow or yellowish citrine; 



throat Martins yellow Myiobius semifiavus. 



a'. Breast and sides distinctly washed with ochraceous. 



b. Smaller (wing of male averaging 65 mm.; tail, 54.5 mm.); 

 upper parts brighter green. 

 c. Color of breast and sides darker, and yellow of under parts 

 duller and less extended posteriorly. 



Myiobius sulphureipygius sulphureipygius. 

 c'. Color of breast and sides paler, and yellow of under 

 parts clearer and more extended posteriorly. 



Myiobius sulphureipygius aureatus. 

 b'. Larger (wing of male averaging 70 mm.; tail, 61 mm.); 

 upper parts darker green. 

 c . Brighter; rump Martins yellow; breast and sides orange 



citrine Myiobius villosus villosus. 



c'. Paler; rump baryta yellow, breast and sides old gold. 



Myiobius villosus peruvianas. 

 A'. Wing nearly or quite equal to tail; tail obviously rounded; under 

 parts more or less buffy. 

 a. Rump Martins yellow; under parts barium yellow, with more or 

 less buffy suffusion, 

 b. Above paler; under parts duller, more uniformly buffy, less 



yellowish Myiobius atricaudus modestus. 



h'. Above paler; under parts paler and more uniform, breast 



less buffy ....Myiobius atricaudus suffusus. 



h". Above darker; under parts barium yellow, anteriorly shaded 

 with old gold or honey yellow. 



Myiobius atricaudus atricaudus. 

 a'. Rump and entire under parts uniform yellowish buff. 



Myiobius ridgwayi. 



Myiobius mastacalis (Wied). 



Muscicapa mastacalis Wied, Reise nach Brasilien, II, 1821, 151 (Rio 



Catol6, Bahia, Brazil; orig, descr.; types now in coll. Am. Mus. Nat. 



Hist.). 

 Muscipeta barbata (not Muscicapa barbata Gmelin) Swainson, Zool. 



Illustrations, II, 1822, pi. 116 and text, excl. syn. (Pitanga ["twenty 



leagues west of Bahia"], Brazil; descr.; crit.). — Wied, Beitrage Naturg. 



Bras., Ill, 1831, 934 (Brazil; references; descr.; habits). 

 Platyrhynchus xanthopygus Spix, Avium Species Novae Bras., II, 1825, 9, 



pi. 9, fig. 1 ([Rio de Janeiro], Brazil; orig. descr.; type in coll. Munich 



Mus.). 

 Tyrannula barbata Hartlaub, Syst. Verz. Nat. Samm. Ges. Mus. [Bremen], 



1844, 50 (Brazil; Swainson's reference). 



