24 Proceedings of the Biological Society of Washington. 



back and wings obviously tinged with brownish, while in those with uniform 

 under parts the upper surface is a purer olive green. In the latter phase the 

 bird more nearly resembles barbatus, and it is easy to understand how with 

 only a few specimens it should have been thus allocated by sundry authors. 

 Our series shows, however, that to whatever cause these variations may be 

 attributed they are certainly not geographical in character. 



M. mastacalis was described from the Rio Catol6, in the province of 

 Bahia, Brazil, and a year later was again recorded from the Bahia region by 

 Swainson. Spix's type of xanthopygus came from Rio de Janeiro. In 

 more recent years the species has been traced north to the Amazon, west to 

 the Madeira, and south to the state of Sao Paulo, so that it appears to 

 occupy by far the larger part of BrazU. Euler describes the nest as an 

 oblong structure, with the entrance on one side, and a kind of conical roof 

 aU around. The eggs are two in number, white, with a rosy blush, with a 

 wreath of dark reddish and violet reddish spots around the larger end. 



Specimens examined. — Brazil: Benevides, 2; Colonia do Mojuy, 4; Villa 

 Braga, 9; Miritituba, 7; Boim, Rio Tapajoz, 1; Cameta, Rio Tocantins, 3; 

 Arumatheua, Rio Tocantins, 3; Victoria, Rio Xingu, 1; Apehu, 1; Ourem, 

 Rio Guama, 2 ; Santa Julia, Rio Iriri, 1 ; San Antonio do Prata, 2 ; Ilhios, 

 Bahia, 1; Bahia, 6; Baron Melgaco, Matto Grosso, 1; Broken Canoe 

 Rapids, Rio Roosevelt, Matto Grosso, 1. Total, 45. 



Myiobius barbatus (Gmelin). 



"Barbichon de Cayenne, mas" D'Aubenton, PI. Enlum., 1778, 830, fig. 1. 

 — BuFFON, Hist. Nat. Oiseaux, IV, 1778, 534, part (Cayenne, French 

 Guiana; descr. male; habits). 



"Whiskered Flycatcher" Latham, Gen. Syn. Birds, II, i, 1782, 364, part 

 (Cayenne, French Guiana; descr. male; habits; ex Buffon). — Stephens, 

 in Shaw's Gen. ZooL, X, ii, 1817, 352, part (Cayenne, French Guiana; 

 references; descr. male; habits). — Latham, Gen. Hist. Birds, VI, 1823, 

 245, part (Cayenne, French Guiana; references; descr. male; habits). 



Muscicapa barbata Gmelin, Syst. Nat., I, ii, 1789, 933 (Cayenne, French 

 Guiana, ex Buffon et Latham; diag.). — Latham, Ind. Orn., II, 1790, 488, 

 part (Cayenne, French Guiana; diag. male; references). — Strickland, 

 Ann. and Mag. Nat. Hist., (1), VII, 1841, 28, in text (taken as type of 

 Tyrannvla Swainson;. 



Myiobius barbatus Cabanis, Arch. f. Naturg., 1847, 248 (designated as 

 type of Myiobius). — Gray, Gen. Birds, I, 1845, 249 (in list of species; 

 references). — Cabanis, in Schomburgk, Reisen in Britisch-Guiana, III, 

 1848, 701 (British Guiana). — Cabanis and Heine, Mus. Heineanum, 

 II, 1859, 67, note (references). — Sclater, Proc. Zool. Soc. London, 1859, 

 45 (range); 1860, 465, part (in list of species; range). — Sclater and 

 Salvin, Proc. Zool. Sor. London, 1867, 751, and 1873, 281 (Xeberos and 

 Chyavetas, Peru). — von Pelzeln, Orn. Bras., ii, 1869, 113 (Borba 

 [?] and Marabitanas, Brazil); iv, 1870, 426 (Brazil, ex Lichtenstein). — 

 Gray, Hand-List Birds, I, 1869, 359 (in list of species; range). — Sclater 

 and Salvin, Nom. Avium Neotrop., 1873, 51, part (range). — Giebel, 

 Thes. Orn., II, 1875, 663 (syn.; range).— Salvin, Cat. Strickland Coll., 



