mpared with 101, 94 in males
compared with 115); color darker above, Fuscous-Black
instead of Cinnamon-Rufous, underparts paler; skull larger
(occipitonasal length 63.7 rather than averaging 58.5 in
females and 68.6 rather than 63.1 in males); wide across
zygomata; nasals actually and relatively longer; rostrum
relatively narrower; wider across mastoid processes of
squamosal; auditory bullae inflated, relatively larger;
maxillary teeth larger.

From _C. z. zodius_, that occurs to the northeast, _C. z.
morulus_ differs in: Body larger (see measurements); hind
foot larger; color of upper parts darker, underparts paler;
skull much larger, broader, more rugose; dorsal profile of
skull slightly concave rather than convex; wider across
zygomata; nasals actually and relatively longer; rostrum
broader, more massive; wider across mastoid processes of
squamosal; auditory bullae larger; maxillary teeth larger.

_Measurements._--The type and an adult female (her
measurements in parentheses) from the type locality measure:
Total length, 358 (338); length of tail, 94 (97); length of
hind foot, 49 (45); occipitonasal length of skull, 68.6
(63.7); basilar length, 58.0 (55.6); zygomatic breadth, 49.3
(45.0); interorbital breadth, 9.6 (8.9); greatest height of
cranium, as explained above, 26.1 (24.6); least depth of
rostrum, 12.5 (10.8); breadth of rostrum, 14.5 (13.7);
length of nasals, 25.9 (22.5); width across mastoid
processes of squamosal, 47.7 (42.8); height of occiput, 19.8
(17.8); length of maxillary tooth-row, 13.9 (13.8).

_Remarks._--_Cratogeomys zinseri morulus_ is the darkest
subspecies known of _C. zinseri_. It differs widely from
other subspecies of this species in color and the large size
of the skull.

_Cratogeomys zinseri_ occurs over the same general area as
_C. gymnurus_ in central Jalisco, although these two species
seemingly do not share the same local habitat. _C. zinseri_
differs from _C. gymnurus_ as follows: Tail relatively
longer; skull wider across zygomatic arches than across
mastoid processes of squamosal (reverse true in _C.
gymnurus_); zygomata strongly bowed outward anteriorly;
maxillary arm of zygomata almost touching squamosal arm
(instead of widely separated from each other) above jugal;
rostr