20 Mr. C. Cliubb on Birds from [Ibis, 



The colour of the back varies, too, from oil-green to rich 

 brown. On the under surface, the abdomen varies from 

 grey to pale brown and the under tail-coverts from 

 ferruginous to deep chestnut. 



I may mention, however, that the differences cited above 

 do not show any partiality for locality or sex ; it may be 

 age of course, but I am unable to distinguish any signs by 

 which to judge on this suggestion. 



There are only six individuals sexed — three males and 

 three females. The average wing-measurement of the males 

 is 198 mm. and the females 191< ; while the average tail- 

 measurement in the male is 215 mm. and tlie female 207. 

 The average measurement of the wing in the whole series is 

 197 mm. and the tail 213. 



Pipile cumanensis. 



Crax cumanensis Jacquin, Beytr. 1784, p. 25, tab. 10 : 

 Orinoco. 



Pipile cumanensis Tacz. Orn. Per. iii. 1886, p. 276; Allen, 

 Bull. Amer. Mus. ii. 1890, p. 107: Falls of the Madeira. ' 

 ' No. 1906. Adult. Rio Perene, Junin, Peru, 800 metres, 

 12 March, 1900. Native name " Pavo.'' "Found in 

 woods." 



No. 2921. Adult. Charuplaya, Bolivia, 1350 metres, 

 5 June, 1901. Native name '^Chui Pavo." " Iris red ; feet 

 red ; bill black ; facial skin blue-white" (P. 0. Simons). 



With a series of thirteen specimens from tlie following 

 localities — British Guiana, Colombia, Ecuador, Peru, Bolivia, 

 and Paraguay, it would appear by the different phases of 

 plumage that there were more than one species. On close 

 observation, however, aided by the few specimens that were 

 sexed, it was noticed that the phases represented male and 

 female — the steel-blue phase being the male, and the oil-green 

 phase the female. 



The white fringes to the feathers on the upper and under 

 surface appear to be a sign of immaturity. 



The female in the Simons collection, No. 2921, is almost 



