_goldmani_ given here extend the known range of
this subspecies northward into southwestern Coahuila. Specimens
assigned to this subspecies from Coahuila compare favorably with
topotypes of _goldmani_ (see tables 1 and 2) but are slightly paler,
and in this respect show some relationship to _excelsus_. The ranges
of these two subspecies however, are partly isolated by mountainous
country in southern Coahuila.

_Specimens examined._--Total, 6, from: W foot Pico de Jimulco, 4600
ft., 1; _Valley Rio Aguanaval, 1 mi. S Jimulco_, 4; 1-1/2 mi. N
Parras, 1.

+Cratogeomys castanops subnubilus+ Nelson and Goldman

1934. _Cratogeomys castanops subnubilus_ Nelson and Goldman, Proc.
Biol. Soc. Washington, 47:145, June 13, type from Carneros, 6800
ft., Coahuila.

_Distribution._--Intermontane valleys and plains of southeastern
Coahuila and probably adjacent parts of Zacatecas, San Luis Potosi and
Nuevo Leon (see fig. 1).

_Comparisons._--_Cratogeomys castanops subnubilus_ needs close
comparison only with _Cratogeomys castanops planifrons_, found to the
east and from which _subnubilus_ differs in: Body, hind foot and skull
smaller; upper parts, in summer pelage, paler, more rufous-buff and
less dark russet; underparts paler, more whitish and less blackish;
hairs of hind foot reddish rather than blackish; zygomata more widely
flaring; palate shorter, especially in females; rostrum broader,
especially in females; nasals slightly smaller; squamosal breadth
greater; incisors narrower, especially in males; maxillary teeth
smaller. From _Cratogeomys castanops rubellus_ Nelson and Goldman,
found to the south in San Luis Potosi, _subnubilus_ differs in: Body,
hind foot and all parts of skull smaller; upper parts and underparts
darker, more blackish and less rufous.

_Remarks._--_Cratogeomys castanops subnubilus_ is the smallest
subspecies of _C. castanops_ (see tables 1 and 2). This subspecies is
dark and lives at high elevations (5500 ft. to 6800 ft.) in deep
valley soils in relatively isolated intermontane valleys and elevated
plains. It is differentiated to a much higher degree from adjacent
subspecies of _C. castanops_ than is usual in this species, and no
intergrades between _subnubilus_ and other subspecies have been taken.
In the Sierra Guadalupe, _subnubilus_ was trapped at 6700 feet within
twomiles of a place where _subsimus_ was taken at 6500 feet.

_Specimens examined._--Total, 31, from: 1 mi. N Ag