pinitia suggests
intergradation with _M. m. montanus_. The tympanic bullae in the
specimens from Wapinitia seem to be smaller than in specimens of
_canicaudus_, _nanus_, or _montanus_.

Because of the intergradation described above between _Microtus montanus
nanus_ and _M. canicaudus_, the latter should stand as _Microtus
montanus canicaudus_.

* * * * *

Bailey (N. Amer. Fauna, 55:206, August 29, 1936) recorded _canicaudus_
from Warm Springs in the Deschutes Valley of Oregon and from the state
of Washington. Other authors also have recorded _canicaudus_ from the
state of Washington. Our examination of specimens leads us to conclude,
as did Dalquest (Univ. Kansas Publ., Mus. Nat. Hist., 2:348, 349, April
9, 1948), that _canicaudus_ does not occur in Washington. The reported
occurrence of _M. canicaudus_ at Warm Springs, Deschutes Valley, Oregon,
seems to be the result of an error in identification. The specimens
concerned seem to be two _Microtus longicaudus mordax_ (Nos. 207060 and
207082 U.S.N.M.). They are labeled as collected at "Warm Springs (Mill
Cr.--20 Mi. W of)". Bailey's (_op. cit._, fig. 46, p. 209) map showing
the distribution in Oregon of _Microtus mordax mordax_ [=_Microtus
longicaudus mordax_] has a locality-dot at Warm Springs itself. Bailey
seems to have erred; he should have placed this dot 20 miles farther
west, we think. When preparing his map (_op. cit._, fig. 43, p. 205)
showing the geographic distribution of _Microtus canicaudus_, Bailey
seems to have misidentified these same two specimens as _M. canicaudus_,
and for them placed a locality-dot on his map 20 miles east (instead of
west) of Warm Springs. In brief, Bailey probably did not see any
specimens of _canicaudus_ or specimens of any other subspecies of
_Microtus montanus_ from Warm Springs.

_Transmitted February 15, 1951._

23-7438

End of the Project Gutenberg EBook of A New Subspecies of Microtus montanus
from Montana and Comments on Microtus canicaudus Miller, by E. Raymond Hall and Keith R. Kelson

*** END OF THIS PROJECT GUTENBERG EBOOK A NEW SUBSPECIES OF MICROTUS ***

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