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Vnwersiiy of California Publications in Zoology [Vol. 30 



of the species Bendragapus fuliginosus in southeastern Alaska to its 

 southern limit at Mt. Pinos, California, there is a steadily increasing 

 degree of graduation in the tail. The same sort of geographical 

 variation (that is, shape of tail) is seen to some extent in the richard- 

 sorm group. Flemingi and richa/rdsonii are alike in possessing square- 

 tipped tails, but the more southern form, obscurus, has the tail slightly- 

 rounded. 



Fig. F. Tails of De.ndra,gapus fuliginosus sierrae and D. f. howardi; about % 

 natural size, a, D. f. sierrae, adult male (M.V.Z. no. 5082) ; 6, D. /. sierrae, adult 

 female (M.V.Z. no. 14069) ; c, D. f. howardi, adult male (coll. T>. E. Dickey, 

 no. K-240); d, D. f. howardi, adult female (coll. D. E. Dickey, no. J-881). 



In the more southern subspecies of the fuliginosus group the gray 

 terminal tail band is notably broader than in the northern races. In 

 the southern obscurus, again, this feature is prominently developed, in 

 contrast to conditions in the more northern richardsonid and flemingi, 

 where it is all but absent. 



