SCIURID^— SC1URUS HUDSONIUS VAR. DOUGLASSI. 679 



of var. hudsonius, — for instance, like No. 2043, from Mount Joy, Pa., 

 and quite a number of others from New York, Massachusetts, and Maine. 

 The lower surface, however, is rich buff. Other specimens are somewhat 

 similar, differing in being darker above and paler below. Specimens from 

 Puget's Sound are profusely annulated below with black, while this feature is 

 absent in California specimens. The tail differs as widely in different speci- 

 mens as it does in typical examples respectively of varieties hudsonius and 

 fremonti, in some examples being gray and black, edged with white, in others 

 deep rufous and black, edged with pale yellow. As will be further noticed 

 under var. fremonti, some of the Fort Crook specimens are almost exactly 

 like Colorado examples of fremonti, while others are intermediate between 

 these and the usual southern phase of var. douglassi. 



In resjiect to the dorsal surface, varieties douglassi and richardsoni are 

 often indistinguishable, the fulvous color of the lower surface in douglassi 

 being the only feature that serves to separate them. No. 8777, from the 

 Lower Kwichpak, is exactly intermediate between them, while other speci- 

 mens still further show a gradual intergradation. Var. douglassi is merely 

 var. richardsoni with the under parts tawny instead of white. This varies, 

 as already noted, in specimens taken at the same locality and season, bom 

 pale buffy-gray to bright reddish-tawny or orange. In other specimens, the 

 tawny is reduced to the faintest shade of fulvous, or is wholly replaced by 

 pure white. The median dorsal band is sometimes wholly absent, though 

 generally faintly traceable, and at other times is strongly developed. The 

 color of the tail varies with the intensity of the tawny of the lower surface 

 of the body. In those with a pale shade of tawny below, the hairs of the 

 tail are yellowish- gray at the base and tipped with white. In those otter- 

 yellow below, the tail-hairs are strongly yellowish at base and tipped with 

 yellowish-white. The light ring surrounding the eye similarly varies from 

 yellowish-white to tawny. 



In winter, the pelage is much softer and fuller than in summer; the ears 

 are then tufted, and the soles densely furred. In summer, the ears are gen- 

 erally tuftless, and the soles are more or less naked. 



Var. FREMONTI. 

 FremonCs Chickaree. 

 Varietal Chars. — Length of head and body 7.75; tail to end of vertebrae 

 4.75; tail to end of hairs 6.50. Above dusky yellowish-gray; beneath pure white 



