38 Proceedings of the Biological Society of Washington. 



Myiohius ridgioayi von Berlepsch, Auk, V, 1888, 457 (Petropolis, Prov. 

 Rio Janeiro, Brazil; orig. clescr.; type in coll. H. von Berlepsch; crit.). — 

 Sharpe, Hand-List Birds, III, 1901, 131 (ref. orig. descr.; range). — Hell- 

 MAYR, Abhand. K. Bayerischen Akad. Wiss., II Kl., XXII, 1906, 643 

 (Victoria, Brazil; von Pelzeln's records; meas.; crit.). — Ridgway, Bull. 

 U. S. Nat. Mus., No. 50, IV, 1907, 488, excl. syn. part? (diag.; ref. 

 orig. descr.). — von Ihering, Aves do Brazil, 1907, 290 (Brazilian locali- 

 ties and references). — von Berlepsch, Ornis, XIV, 1907, 481 (crit.). — 

 Todd, Ann. Carnegie Mus., VIII, 1912, 208, in text (crit.). — Brabourne 

 and Chubb, Birds S. Am., I, 1912, 296 (ref. orig. descr.; range). 



Myiohius barbatus var. ridgwayi Dubois, Syn. Avium, I, 1902, 245 (ref. 

 orig. descr.; range). 



Description.— Male: above light brownish olive; small vertical spot pale 

 lemon yellow; rump yellowish buff (near mustard yellow); tail (with 

 sometimes longer upper coverts) dull black; wings dusky brown with more 

 or less brownish olive edgings; below (including under wing-coverts) yel- 

 lowish buff, almost uniform, but deepening a little on the crissum; inner 

 edges of remiges below more or less buffy. Female similar, but the vertical 

 spot (usually?) wanting. 



Measurements. — Male (two specimens): wing, 58-59; tail, 58-59; bill, 

 10-10.5; tarsus, 16-16.5. Female (one specimen): wing, 55; tail, 56; 

 bill, 10. 



Range. — Southern Brazil, in the provinces of Sao Paulo, Rio de Janeiro, 

 and Espirito Santo. 



Remarks. — This is a very distinct species, readily known by its uniform 

 "buffy yellow rump and lower parts. These peculiarities were first remarked 

 by von Pelzeln in the case of three specimens collected by Natterer at 

 Ypanema and Luiz d'Almeida, southern Brazil, but the species as such 

 remained unrecognized and undescribed until 1888, when von Berlepsch 

 formally characterized it on the strength of a specimen in his own collection 

 from Petropolis (near Rio Janeiro), Brazil, and another in the collection of 

 the U. S. National Museum without exact locality, but probably from the 

 ■same general region. In 1906 Mr. Hellmayr discovered that the speci- 

 mens referred to as different by von Pelzeln many years before really 

 belonged to the present species. Mr. Ridgway refers several more recent 

 records by von Ihering here also, but inasmuch as this author discriminates 

 between ridgwayi and mastacalis in his work on the Birds of Brazil we are 

 inclined to accept his determination. Little is known of the present species, 

 and very few specimens appear to be extant. While its range is known to be 

 included in that of Myiobius mastacalis, it does not yet appear whether the 

 two species are actually found together, or whether M. ridgwayi occupies 

 the higher and M. mastacalis the lower levels. It seems to be more closely 

 related to M. atricaudus than to any other form of this generic group. 



Specimens examined. — Brazil : Petropolis, 1 ; Therezopolis, Organ Moun- 

 tains, 1; unspecified, 2. Total, 4. 



