54 



BULLETIN 117, UNITED STATES NATIONAL MUSEUM. 



is ail extreme example of the light form, while the other is typical 

 of the dark form. A male from the Falklands, however, is as large 

 as some and but slightly smaller than other Chilean birds, while in 

 two females from the Falklands the wing is shorter than in Chilean 

 bu'ds, but not quite so short as in Argentine specimens. In the 

 length of the tarsus and bill there appear to be no diagnostic differ- 

 ences in size. 



Measurements of males. 



Wins;. 



Bill. 



Bertrand Island, Chile, immature ^ 317 



Do.i ! 310 



Temuco, Chile, immature * ! 323 



Ancud, Chile, immature ^ { 322 



Do.' I 314 



I'iilkland Island, adult ^ j 312 



Perico, Jujuy, immature ^ I 290 



Perico, Jujuy, adult ^ I 305 



Puno, adult ^ I 319 



~ " ' " 292 



308 

 307 

 298 



La Raya, adult 2. 

 Do. 



Junin, adult ^ — 

 Junin, immature 



77 



75 



67.5 



71.5 



74 



78 



72 



75 



77 



72 



73 



77 



74 



Cyanocephalus. 



' Tayazu-guira. 



Measurements of females. 



Bill, 



Bertrand Island, Chile, immature '. . 



Do.' 



Do.i 



Straits of Magellan, immature ' 



Temuco, immature ' 



Temuco, adult ' 



Do.» 



Falkland Island, immature ^ 



Falkland Island, adult * 



Tafi del Valle, Tucuman, immature ^ 



Embarcacion, Salta, immature ' 



Vinto, Bolivia, immature ' 



Puno, Titicaca, immature ^ 



Calca, Peru, adult ^ 



70 



72 



72 



71 



73 



67 



70 



71 



71.5 



66 



68 



67 



75 



70 



1 Cyanocephalus. ' Tayazu-guira. 



(483) TIGRISOMA SALMONI Sclater and Salvln. 



Tigrisoma salmoni Sclater and Salvin, Proc. Zool. Soc, 1875, p. 38 (Lower 

 Cauca River, Col.). — Berlepsch and Stolzmann, Ornis, 1906, p. 102 (Idma). 



