1908.] NATURAL SCIENCES OF PHILADELPHIA. 501 



southern macroura, to which he thought his bird must be referred, and 

 which he thought required a new name. 



Specimens examined from Chapada, Matto Grosso, Corumba, Matto 

 Grosso, Bahia, Para and Rio Janeiro. 



The Para specimen approaches cayana, while those from Rio Janeiro 

 are darker, showing a possible tendency toward macroura. 



Piaya cayana macroura (Gambel). 



Piaya macroura Gambel, Journ. Acad. Nat. Sci. Phila., 1849, p. 215 ['Suri- 

 nam' loc. err. fide Cabanis and Heine, Mus. Hein., IV, p. 87 = Paraguay]. 



Piaya dree Bonaparte, Consp. Avimn, I, p. 110, 1850 ['Colombia,' loc. 

 err. fide Cabanis and Heine = Paraguay]. 



P. c. var. guaurania von Hiring, Rev. Mus. Paulista, 1904, 448 [S. Brazil]. 



Length of wing, 6.75; tail, 15.10. 



Above walnut brown sometimes tinged with burnt umber, wings 

 tinged with chestnut and tail with bay, slightly glossed with wine 

 purple, head distinctly gray; thighs dark gray, crissum nearly black; 

 underside of rectrices dull black excepting the white tips, no trace of a 

 subterminal band. 



Specimens examined from Paraguay; Brazil — Rio Grande do Sul. 

 Piaya cayana boliviana subsp. nov. 



Length of wing, 5.85; tail, 11.50. 



Above walnut brown, wings and rump tinged with chestnut, tail 

 tinged with bay, both glossed with wine purple; flanks dark gray, 

 crissum slightly darker; under side of rectrices dull black with tips 

 white, no trace of a subterminal band. 



This race is exactly like macroura except for the gray crissum and 

 much smaller size. 



Type No. 30,850, Amer. Mus. Nat. Hist. Yungas, Bolivia. Dr. 

 H. H. Rusby. 6,000 ft. 1885. Wing, 5.90; tail, 11.60. 



Specimens examined from Bolivia — Yungas, La Paz; Peru — Inca 

 Mine. 



