ant from the holotype in the same stratum
as the holotype and on the same date by the same collector
(a staff member of the Department of Biology of Midwestern
University, Wichita Falls, Texas).

[Illustration: FIG. 1. _Cynarctus fortidens_, No. 11353 KU (Midwestern
Univ. No. 2044). Lateral view of holotype x 1, and occlusal view of
check-teeth x 2.]

[Illustration: FIG. 2. _Cynarctus fortidens_, No. 11354 KU (Midwestern
Univ. No. 2045). Lateral view of right lower mandible and m2 x 1 and
oblique occlusal view of m2 x 2.]

_Diagnosis._--Size large (see measurements); no accessory
cusp between protocone and paracone of fourth upper
premolar; first upper molar longer than broad and lacking
cingulum on part of tooth lingual to protocone.

_Comparisons._--From _Cynarctus crucidens_ Barbour and Cook
(see page 225 of Two New Fossil Dogs of the Genus Cynarctus
from Nebraska. Nebraska Geol. Surv., 4(pt. 15):223-227,
1914; also pages 330 and 338 of Dental Morphologie of the
Procyonidae with a Description of Cynarctoides, Gen. Nov.
Geol. Ser. Field Mus. Nat. Hist., 6:323-339, 10 figs.,
October 31, 1938) _C. fortidens_ differs in lacking, instead
of having, an accessory cusp between the protocone and
paracone of the fourth upper premolar and in lacking,
instead of having, a cingulum on the part of P4 that is
internal (lingual) to the protocone.

_Remarks._--The lower jaw and its second molar seem to be
from an individual significantly larger than the holotype.
Possibly the lower jaw and upper jaw are from two species but
the lower jaw probably is from a male and the upper jaw from
a female of the same species.

Reasons for regarding _Cynarctus_ as belonging to the family
Canidae instead of to the family Procyonidae have been stated
recently in detail by E. C. Galbreath (Remarks on
_Cynarctoides acridens_ from the Miocene of Colorado. Trans.
Kansas Acad. Sci., 59(3):373-378, 1 fig., October 31, 1956)
and need not be repeated here. Although some uncertainty
remains as to the familial position of _Cynarctus_, we favor
Galbreath's view that the genus belongs in the family
Canidae.

The holotype of _Cynarctus crucidens_ is from Williams
Canyon, Brown County, Nebraska. According to C. B. Schultz
(_in litt._, December 6, 1961), Williams Canyon is a
tributary of Plumb Creek; the upper