112 On a new Species of Grebe from Central Peru. 



viz. an adult female and a young bird collected on Lake 

 Junin, 16th August, 1872, are referable to true P. calUparceus, 

 or perhaps to a new subspecies of it. From the adult bird 

 from Punta Arenas, Magellania, the last-named female differs 

 as follows : — 



The coloration of the fore part of the upper head is much 

 darker. The long linear silky plumes of the auricular 

 region are grey, with but a slight yellowish lustre, while in 

 the Magellan bird they are of a golden straw-yellow. 



The black hood is as well developed and consists of ruffled 

 plumes as in true P. calliparceus, but it is not so sharply 

 separated from the greyish fore part of the pileum. As in 

 P. taczanowskii, the black of the nuchal region descends along 

 the upper part of the neck as far as the upper back, but 

 becomes more brownish on the neck. 



The thi'oat, including the region under the eyes (cheeks), 

 is of a pure white instead of being brownish grey. There 

 is left only a very narrow line of brownish grey just below 

 the eyes, and the dark coloration of the upper head and 

 upper neck is sharply separated from the white of the cheeks 

 and the sides of the neck. The bill has a whitish tip, being 

 altogether black in the Magellan bird. 



The young bird of this form differs from the adult in 

 having the long silky auricular plumes, and in the greyish 

 colour of the fore part of the head blending gradually into 

 the black of the nuchal region. Both specimens, in the 

 form of the bill, agree perfectly with true P. callipar(RU!i from 

 Magellania. 



It appears, therefore, that the specimens of P. calliparteus 

 from Lake Juniu, as regards coloration, approach somewhat 

 to our new species P. taczanowskii, while in the form of the 

 bill, and in other respects, they agree with true P. calliparmus. 

 Should the difference, as pointed out above, prove to be con- 

 stant, we wish to reserve for the Junin bird the name P. calli- 

 parceus juninensis, Berl. & Stolzm. Lastly, it may be well to 

 refer to the fact that there is but slight variation observable in 

 the length of the bills in specimens of P. taczanowskii as mcII 

 as in those of P. caUiparans and its supposed subspecies. 



