BIRDS OF NORTH AND MIDDLE AMERICA, 



487 



Coloration.— Above plain, rather dark olive, the upper tail-coverts 

 and tail black or blackish brown; a crown-patch and broad band 

 across rump light yellow; under parts light olive or fulvous, passing 

 into pale yellow on abdomen and pale grayish or dull whitish on 



throat. 



^a^,^g._Southern Mexico to Peru, Bolivia, eastern Brazil, and 

 Guiana. (About six species, including subspecies.) 



KEY TO THE SPECIES AND SUBSPECIES OF MYIOBIUS. 



fl. Rump sulphur or primrose yellow; under parts not uniform buff-yellow or yellowish 

 buff; back dark olive or greenish olive. 

 b. Chest and sides pale buffy grayish brown or pale buffy olive. ( Myiobiiis barbntiis.) 

 c. Tail more fuscous (dusky). (Guiana; Cayenne; Amazon Valley?) 



Myiobius barbatus barbatus (extralimitali.'^ 



cc. Tail deep black. (Panama and Costa Rica.) 



Myiobius barbatus atricaudus (p. 488). 

 bb. Chest and sides ochraceous-brown or cinnamon-brownish. {Myiobius xanthopij- 



gns.) 

 c. Back greenish olive; l)rownof chest and sides paler; yellow of abdomen more 



extended. 

 d. Under tail-coverts pale buffy brown or cinnamon, without darker bars; olive 

 of back and brownish of chest and sides paler. (Eastern Brazil.) 



Myiobius xanthopygus xanthopygus (extralimital).& 

 dd. Under tail-coverts usually pale yellow, with narrow bars, or other markings, 

 of dusky; olive of back and brownish of chest and sides darker. (South- 

 ern Mexico to Panama.) Myiobius xanthopygus sulphureipygius (p. 490^ 



a [Muscicapa] barbata Gmelin, Syst. Nat., i, pt. ii, 1788, 933 (based on Barbichondu 

 Cayenne, 7nas, Daubenton, PI. Enl., pi. 830, fig. 1).— Tyrannula barbata Swainson^ 

 Zool. Journ., iii, 1827, 359.— [Myiobius] barbata Bonaparte, Consp. Av., i, 1850, 187 

 (Cayenne).— if[2/io6r»s] barbatus (not Myiobius barbatus Burmeister, 1856) Cabanis and 

 Heine, Mus. Hein., ii, 1859, 67, footnote (Guiana).— i/i/io6iHS barbatus Sclater, Cat. 

 Birds Brit. Mus., xiv. 1888, 199, part (Bartica Grove, Camacusa, Roraima, and Ata- 

 purow R., British Guiana; Oyapoc, Cayenne; Amazons); Salvin, Ibis, 1885, 295 (Brit. 

 Guiana).— (?) Myiobius sulphureipygius (not Tyrannula sulphur eipygia Sclater) Mene- 

 gaux. Bull. Mus. Hist. Nat. Paris, 1904, 118 (St. Georges d'Oyapoc, Guiana). 



I have not been able to examine a specimen of this form, and therefore can not be 

 sure that I have given the best statement of the characters wherein it differs from the 

 Panama form. Doctor Sclater considers them as not separable; but as he also unites 

 with them M. xanthopygius, which is certainly distinct, I follow Count von Berlepsch 

 and others in separating subspecifically M. atricaudus Lawrence. 



b Platyrhynchus xanthopygus Spix, Av. Species Novse ("Av. Bras."), ii, 1825, 9, 

 pi. 9, fig. 1 (Brazil; coll. Munich Uus.). —Mlyiobius] xanthopygus Cabanis and Heine, 

 Mus. Hein., ii, 1859, 67 (Bahia); Berlepsch, Auk, v, 1888, 457, 458, in text (crit.).— 

 Myiobius xanthopygius Pelzeln, Orn. Bras., ii. Abth., 1869, IIS.— [Myiobius] xanthopy- 

 gius Pelzeln, Orn. Bras., iv. Abth., 1870, 426.— Muscipeta barbata (not Muscicapa 

 barbata Gmelin) Swainson, Zool. Hlustr., ii, 1822. pi. 116; Maximilian, Beitr. Naturg. 

 Bras., iii, 1831, 9M.—T[yrannula] barbata Hartlaub, Verz. Mus. Brem., 1844, 50.— 

 Myiobius barbatus Burmeister, Syst. Ueb. Th. Bras., ii, 1856, 501; Sclater, Cat. Birds 

 Brit. Mus., xiv, 1888, 199, part (Bahia). 



