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MONtKJUAl'US OK NOUTU AMliltlCAN KODICNTIA. 



■ Tlie iil)s()liit(! size ftiid rclativo proportions of tliis species will he illiis- 

 Iraled by tlie following tiil)l(! of menstircnients, and reipiire no further remark. 



Taim.k XXV. — Mittnurcmenli of liitlrc «;«iimdn of IIkxpriiomym AURKOu;g. 



We lire iiniihlc to appreciate any (lifTerences whatever in the series of 

 skulls of this species as compared with a large nuinl)er of those of leucopux. 



This elegant species inuy usually he distinguished at a glance from leu- 

 copiis hy the i)eculiar and hcautifiil tint of tlie fur— a rich golden-cinnamon^ a 

 little darker from admixture of blackish hairs along the hack; the ears like 

 the general color, this extending on the fore legs to the paws, and a tiiint wash, 

 of the same tinting the under jiarts, between which and the upper parts the 

 line of deinarkation is usually obscure, , and often, as in No. 1580, from Knox- 

 villc, Tenn., inapi)recial)'e. The brighcst-colorcd samjdes of leucnpun we have 

 seen invarial)ly lean to ciiestnut-fulvous, instead of the peculiar orange-fulvous 

 of aureolux. The dilKjrence in the shade is hard to express in words, but it 

 catches tlio eye at once. These brighter Ifuco/iu.s, moreover, have tlie cars 

 dusky and the under parts snow-white, while in nureolm the orange tinges 

 both these in a per;;eptible degree. The tail is but little paler below than 

 aliove, with rarely, if ever, a line of deinarkation. 



While there is no question of the positive difference of this species from 

 /eucnpuK, even tiie sinull series liefore us shows considerable variation. In No. 



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