Species of the Genus Pipra. 25 



iris reddish orange (S. M. Klages, MS.), dark red (A. 

 Robert, MS.). 



There is no constant difference in size or colour between 

 specimens from various localities. Two males from Veragua 

 agree in dimensions with typical birds from the Guianas, 

 while the form inhabiting the highlands of Colombia, Ecuador, 

 and Northern Peru is considerably larger. 



On the other hand, there is a good deal of. individual 

 variation in the females. Some are nearly uniformly cine- 

 reous below, shewing only a slight greenish suffusion across 

 the chest and along the sides. I have such specimens from 

 Chamicuros and the Caura River, Venezuela. Other examples 

 from the same places, however, are much more greenish, 

 being almost devoid of grey on the lower parts. In most 

 specimens the head is distinctly mixed with greyish, only in 

 a few is this scarcely apparent. The back is always of a 

 purer and brighter olive-green than in the female of the 

 foregoing species. 



Specimens from various localities measure as follows : — 



Wing. Tail. 



J tf ad. mm. mm. 



3 : Brit. Guiana 63-65 25-26 



2 : Para , 60, 62 23, 25 



7 : Rio Negro 60-64 25-28 



3 : Bahia 60-63 25-27 



6 : Chamicuros, E. Peru 58-62 25-27 



3 : Suapure, Caura 64-66^ 25^-28 



8 : Nicare, Caura l 64-67 27-30 



8 : La Pricion, Caura 1 64-66 27-29 



1 : " Orinoco " male 64 27 



2 : Veragua 59±, 60^ 27 



22- 



1 : Brit. Guiana 65 26 



2 : Para 61, 62 25, 27 



8 : Rio Negro 59-64 26^28 



2 : Bahia 60, 64 27 



4 : Chamicuros, E. Peru 59-62 26-27 



2 : Xeberos, E. Peru 59, 60 25, 26 



6 : Caura River x 64-67 26-30 



1 As will be observed, the Caura specimens are rather larger on 

 average. 



