PLATE 1 



Ventral view of heads of Branta canadensis minima, illustrating variation 

 in color patterns. The Museum numbers of the specimens shown, reading from 

 left to right, are as follows: upper row, 22076, 22033, 22021, 22060, 22014, 

 22045, 22038; lower row, 22031, 22021, 22027, 22039, 22017, 22044, 22056. 



The specimens in the upper row are arranged to show variation in the 

 breadth of the white collar, ranging from the one at the extreme left, in 

 which there is more white than black on the neck, through varying degrees 

 to the specimen at the extreme right, in which the white collar is totally 

 lacking. 



The lower row shows variation in the black throat bar, this mark being most 

 highly developed in the specimen at the extreme left, and ranging through 

 lessening degrees of extensiveness to total absence in the one at the extreme 

 right. 



As shown here there is no correlation between these two markings, each 

 of them varying independently of the other. Another color character, the 

 shade of the underparts (hardly apparent in a black and white illustration) 

 also varies independently of either of these. The birds shown on the plate 

 were all collected in their winter home. 



[22] 



