new Species of Grebe from Central Peru. Ill 



As regards the coloration of the plumage there is also 

 much difference observable between the two species. In 

 P. taczanowskii the long linear plumes springing from the 

 auricular region are much longer, but not so ample as in 

 P. caUiparaus ; they are of a silky cinereous brown instead 

 of a golden straw-colour. The front part of the upper head, 

 including the upper cheeks, is rather darker than in P. calli- 

 paraus, being of a dark cinereous instead of a pale brownish 

 grey. This colour on the occiput blends gradually into the 

 black of the nuchal region, while in P. calliparceus the 

 brownish grey of the pileum and the deep black of the occi- 

 put are sharply separated. The black of the nuchal region 

 in P. taczanowskii descends much farther down on the upper 

 neck, nearly as far as the upper back, while in P. calliparcEus 

 there is only a brownish cinereous stripe along the upper 

 neck, the black being nearly restricted to the nuchal region. 

 In P. taczanowskii the plumes of the black occiput are smooth, 

 while in P. calliparceus they are ruffled or somewhat re- 

 curved. 



In P. taczanowskii the cheeks and the throat are pure 

 white, uniform with the remaining parts of the under sur- 

 face of the body, while in P. calliparceus the cheeks and the 

 throat are pale brownish grey, uniform with the fore part 

 of the upper head. The outer webs of the secondaries in 

 P. taczanowskii are mostly white, being only more or less 

 freckled with ashy grey, while in the other species they are 

 nearly uniform greyish brown, and not very conspicuously 

 freckled or variegated with white. 



Before Kalinowski succeeded in getting his specimens, this 

 interesting bird had been already obtaiued by Mr. C. Jelski, 

 but its distinctness from P. calliparceus was not recognized by 

 Taczanowski. Stolzmann, having examined the specimens in 

 the University Museum at Warsaw, states that three birds 

 are contained in it which were collected at Lake Junin by 

 Jelski and named P. calliparceus by Taczanowski. Of these 

 a female collected on Lake Junin, 16th August, 1872, 

 belongs to our new species P. taczanowskii, agreeing perfectly 

 with Kalinowski's specimens. The other two, nevertheless. 



