RODENTIA-SC1URIJVAE-CYNOMYS GCJN.NISONII, 
337 
the summer specimens exhibit no trace whatever of it. The arctomys lewisii of Audubon and 
Bachman come much nearer in point of color to the description of Lewis and Clark. It may 
be that there is a permanently reddish species on the Columbia, and, as I have already stated, 
I consider it by no means improbable that Captain Beckwith’s specimen may be specifically 
different from those of Lieutenant Bryan, which would make three in all. 
1 Probably too short. # Skin stretched. 
43 L 
