. Breviora. 1962 NEW OLIGOCENE RODENT color (Wilson 1949), that of aplodontids is not pigmented. Among the many incisors picked out of the ant mounds are a few with orange color, and those of appropriate size could well pattersoni. belong to P. Fig. 3. Pipestoneomys pattersoni. no. 7112, EMi ground down to show pattern near base of crown. X 25. The past and present distribution of aplodontids is also of some interest in this connection. Not only is the range of Recent Aplo- dontia limited to a strip along the west coast of North America, but no unquestioned fossil form has been found ea
. Breviora. 1962 NEW OLIGOCENE RODENT color (Wilson 1949), that of aplodontids is not pigmented. Among the many incisors picked out of the ant mounds are a few with orange color, and those of appropriate size could well pattersoni. belong to P. Fig. 3. Pipestoneomys pattersoni. no. 7112, EMi ground down to show pattern near base of crown. X 25. The past and present distribution of aplodontids is also of some interest in this connection. Not only is the range of Recent Aplo- dontia limited to a strip along the west coast of North America, but no unquestioned fossil form has been found east of the Great Basin. 1 If this picture of geographic distribution is adequate, we may have another item of evidence that argues against aplodontid affinities for Pipestoneomys. Pipestoneomys seems to me to fit more reasonably into the Cas- toridae than into the Aplodontidae, and I know of no other family of appropriate range to which it might be referred. If this tentative assignment is correct, the genus is the earliest beaver so far known, although its position in castorid phylogeny is un- certain, EEFERENCES DONOHOE, J. C. 1956. New aplodontid rodent from Montana Oligocene. Jour. Mam- mal., 37: 264-268. McGrew, p. O. 1941. The Aplodontoidea. Geo!. Ser., Field Mus. Xat. Hist., 9: 1-30. iShotwell. in his interesting studj of the aplodontids (I'J-jS), mentions Pipes- toneomys only in passing, noting that P. bisulaatits occurred well to the east of thf other known Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harvard University. Museum of Comparative Zoology. Cambridge, Mass. , Museum of Comparative Zoology, Harvard University
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