16 PROCEEDINGS OF THE NATIONAL MUSEUM vol.74 



(average, 62) ; tail, 46-50 (48) ; bill, 11.5-12 (11.7) ; tarsus. 20.5-21.5 

 (21.2). 



Range. — Valley of the Rio Maraiion, Peru. 



Remarks. — Although easily told from both P. fulvicauda futvl- 

 Cauda and P. f. poliothrix., this form so closely resembles P. sem'i- 

 cervimi semicervina of western Ecuador as to be distinguishable only 

 upon comparison of series. It has the same dark coloration above, 

 and buffy sides of the head, but the under parts are much whiter, 

 and the terminal part of the tail inclines more to medal bronze th.an 

 to mummy brown, although there is some variation in both forms 

 in this respect. It appears to be confined to the Maranon Valley 

 in northwestern Peru, its characters and range thus suggesting how 

 semicervina may have been derived from the cis- Andean form. 

 fidvicauda, through the present race. 



Specimens examined. — Peru: Huarandosa (3,000 feet), Valley 

 Rio Chinchipe, 2; Pomara (1,100 feet), lower Rio Maranon, 3. 

 Total, 5. 



PHAEOTHLYPIS FULVICAUDA POLIOTHRIX (von Bcrlepsch and Stolzmann) 



Baslleuferus uropygialis (not of Sclater) Taczanowski, Proc. Zool. Soc 



London, 1874, p. 509, excl. syu. (Monterico and Amable Maria, Peru) : 



Orn. Perou, vol. 1, 1SS4, p. 478, part (Monterico and Amable Maria. 



Peru; habit.s). 

 Basilcuterus uropygialis poliothrix von Berlepsch and Stolzmann, Proc 



Zool. Soc. London, 1896, p. 331 (La Gloria and La Merced, Peru; orig. 



descr. ; t.vpe formerly in collection Warsaw Mu.s.) ; 1902. p. 60 (Chan- 



chamayo, Peru). 

 Basilcuterus fulvicanda poliothrix HEnxMAYE, Abhand. K. Bayerischen 



Akad. Wiss., II Kl., vol. 22, 1906, p. 653, in text (crit.) ; Nov. Zool., vol. 



17, 1910, p. 265, in text (ref. orig. descr.; crit.) ; Arch. f. Naturg., vol. 85, 



A, 1919, p. 7, in text (Chanchamayo, Peru; crit). 



Subspedfc characters. — Similar to Phaeoihlypis fidvicauda fulvi- 

 canda^ but ujjper parts more olivaceous, less brownish in tone ; upper 

 tail-coverts and basal part of tail paler bulfy; sides of head, and 

 flanks and crissum also paler buffy ; and terminal band of tail more 

 greenish, less brownish. 



Measureinents. — Male (four specimens) : Wing, 64-68 (average, 

 66); tail, 50-53 (51.5); bill, 11-11.5 (11.2): tarsus. 21-22 (21.4). 

 Female (one specimen) : Wing, 63; tail, 50; bill, 11 ; tarsus, 21. 



Range. — Tropical Zone, central to southeastern Peru. 



Remarks. — The gray crown and nape were supposed by the 

 describer to be the chief character of this form, but I do not see that 

 there is any difference of moment in this respect. The type I have 

 not seen, but a specimen from Perene, Junin, Peru, ought on geo- 

 graphical grounds to represent the form, and the other skins from 

 southeastern Peru agree with it sufficiently well, and differ from 



