Vol. 32, pp. 253-268 December 31, 1919 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



DESCRIPTIONS OF PROPOSED NEW BIRDS FROM 

 PERU, BOLIVIA, BRAZIL, AND COLOMBIA.' 



BY FRANK M. CHAPMAN. 



Continued study 2 of the birds collected by the Yale Univer- 

 sity-National Geographic Expedition to the Urubamba region 

 of Peru, and, incidentally, of other collections received by the 

 American Museum from South America, has led to the conclu- 

 sions presented in the following pages. The color terms em- 

 ployed are those of Ridgway's "Color Standards and Color No- 

 menclature" (Washington, 1912). 



I acknowledge, gratefully, the loan of specimens for compari- 

 son from the Museum of Comparative Zoology, through the 

 courtesy of Mr. Outram Bangs. 



Micropus peruvianus, new species. 



Specific characters. — Resembling Micropus andecolus (Lafr. & d'Orb.), 

 but tail shorter, less deeply forked, white areas of the plumage without 

 buffy tints, forehead darker, basal under tail-coverts with much less white. 



Type. — No. 145,007, Am. Mus Nat. Hist., 9 ad., Ollantaytambo, alt. 

 9700 ft., Peru, July 22, 1916; F. M. Chapman. 



Description of type. — General coloration fuscous, the wings and tail with 

 olivaceous reflections; sides of the nape white more or less tinged with 

 dusky; auriculars dusky; rump white; upper tail-coverts like the back; 

 outer tail-feathers lacking the greenish lustre of the others and paler basally ; 

 inner secondaries paler than outer quills and faintly tipped with whitish; 

 under wing-coverts dusky, the smaller ones browner; under parts white, 

 the sides and flanks more or less dusky; longer lower tail-coverts fuscous, 

 shorter ones white basally, broadly tipped with dusky or fuscous; depth of 

 tail-furcation 12.5 mm. 



lSee also "Descriptions of Proposed New Birds from Peru, Bolivia, Argentina, and 

 Chile." Bull. Am. Mus. Nat. Hist., XLI, 1919, pp. 323-333. 



2 Published by permission of the Trustees of the American Museum of Natural History. 



54— Pkoc. Biol. Soc. Wash., Vol. 32, 1919. (253) 



