f cranium,
as explained above, 22.6 (22.4); least depth of rostrum, 11.2
(10.4); breadth of rostrum, 13.3 (13.9); length of nasals,
21.7 (21.2); width across mastoid processes of squamosal,
37.1 (36.8); height of occiput, 17.7 (17.9); length of
maxillary tooth-row, 13.0 (13.3). A nearly adult female
measured: Total length, 292; length of tail, 81; length of
hind foot, 39; occipitonasal length of skull, 53.3; basilar
length, 46.5; zygomatic breadth, 34.1; interorbital breadth,
7.8; greatest height of cranium, 21.0; least depth of
rostrum, 9.8; length of nasals, 18.0; width across mastoid
processes of squamosal, 32.2; depth of occiput, 15.9; length
of maxillary tooth-row, 12.1.

_Remarks._--This newly described subspecies is the smallest
of known races of _C. zinseri_, and it is seemingly more
closely related to _C. z. zinseri_ than to the subspecies
newly named below from the north end of Lago Sayula. The
skulls of females are especially small and delicate in
structure; the males are larger with more massive skulls.
_C. z. zodius_ is known to occur in the foot hills north of
the Cerro Viejo, the mountain from which _C. g. atratus_ was
described above.

_Specimens examined._--Seven, 13 mi. S and 15 mi. W
Guadalajara.

=Cratogeomys zinseri morulus= new subspecies

_Type._--Male, adult, skull and skin, No. 36679 Mus. Nat.
Hist., Univ. Kansas; from N end Lago Sayula, 4400 ft., 9 mi.
N and 2 mi. E Atoyac, Jalisco, Mexico; obtained on March 23,
1950, by J. R. Alcorn, original No. 10889.

_Range._--Known only from the type locality in central
Jalisco.

_Diagnosis._--Size large (see measurements); tail short;
hind foot large; upper parts Fuscous-Black, strongly mixed
with Walnut Brown, underparts Cinnamon-Buff, bases of all
hairs Plumbeous; skull large, broad, rugose; outline of
dorsal profile slightly concave, almost flat; zygomata
strongly constructed, maxillary arm almost touching
squamosal arm over jugal; wide across zygomata; nasals
actually and relatively long; rostrum relatively narrow;
auditory bullae inflated, relatively large; maxillary teeth
relatively large.

_Comparisons._--From topotypes of _C. z. zinseri_ from
Lagos, Jalisco, _C. z. morulus_ differs in: Tail shorter
(averaging 96 in females co