closely resembles _C. g. inclarus_, which occurs at
comparable elevations in the Sierra Nevada, but the skulls
are unlike. Among named subspecies of _C. gymnurus_, the
skull of _tellus_ most closely resembles that of _atratus_,
and, although they differ greatly in size, _C. g. tellus_
seems to be the closest relative of _C. g. atratus_.

This newly described subspecies is known only from Cerro
Viejo and is probably restricted to the higher elevations on
this mountain.

_Specimens examined._--Seven, Top of Cerro Viejo de Cuyutlan,
19 mi. S and 9 mi. W Guadalajara.

=Cratogeomys zinseri zodius= new subspecies

_Type._--Male, adult, skull and skin, No. 31879 Mus. Nat.
Hist., Univ. Kansas; from 13 mi. S and 15 mi. W Guadalajara,
Jalisco, Mexico; obtained on February 6, 1949, by J. R.
Alcorn, original No. 7747.

_Range._--Known only from the type locality.

_Diagnosis._--Size small (see measurements); tail short; hind
foot small; upper parts Sayal Brown, underparts Pinkish Buff,
hind foot whitish; skull small, narrow; outline of dorsal
profile of skull concave; zygomatic breadth narrow; nasals
actually short, but relatively long; width across mastoid
processes of squamosal short; auditory bullae inflated;
interorbital constriction narrow; maxillary teeth relatively
large.

_Comparisons._--From topotypes of _C. z. zinseri_ from Lagos,
Jalisco, _C. z. zodius_ differs in: Body smaller (see
measurements); tail shorter, hind foot smaller; upper parts
dull brownish instead of reddish-brown, underparts paler,
hairs of feet whitish instead of brownish; skull smaller,
especially in females, narrower; dorsal profile of skull
concave or flat (females) rather than convex; zygomatic
breadth less; rostrum narrower and shallower; nasals actually
shorter, but relatively longer in relation to length of
skull; width across mastoid processes of squamosal shorter;
maxillary teeth smaller.

_Measurements._--The type and an adult male (his measurements
in parentheses) yield measurements as follows: Total length,
318 (324); length of tail, 95 (89); length of hind foot, 41
(41); occipitonasal length of skull, 60.5 (59.1); basilar
length, 52.4 (51.8); zygomatic breadth, 40.6 (39.0);
interorbital breadth, 8.3 (8.8); greatest height o