kedly
from _bullatus_ that the two can be distinguished easily by this
feature alone. The skull of _C. c. convexus_ approaches that of
_ustulatus_ in size, but is smaller in all respects, save breadth of
rostrum.

This pocket gopher is found commonly along the Rio Salado and its
watershed. Fallow cotton fields in the vicinity of Anahuac [=
Rodriques], Nuevo Leon, are preferred living places. This subspecies
was found at elevations as high as 1000 feet and as low as 600 feet.

_Specimens examined._--Total, 10, from: Don Martin, 800 ft., 5; _base
of Don Martin Dam_, 2; _2 mi. SE Don Martin Dam, along Rio Salado_, 2;
5 mi. SE Don Martin, 1.

_Records from Nuevo Leon._--Total, 14, from: 9 mi. N and 2 mi. W
Anahuac [= Rodriques], 1; 4 mi. N and 1 mi. W Anahuac [= Rodriques],
5; 3 mi. N Lampazos, 4; 1 mi. N Vallecillo, 1000 ft., 1; Vallecillo,
20 mi. S Rio Salado, 1000 ft., 3.

+Cratogeomys castanops jucundus+ new subspecies

_Type._--Female, adult, skin and skull; No. 56603, Univ. Kansas Mus.
Nat. Hist.; Hermanas, 1205 ft., Coahuila; 5 December 1953; obtained by
Robert W. Dickerman, original number 2051.

_Distribution._--Arid plains and broad intermontane valleys of
east-central Coahuila (see fig. 1).

_Diagnosis._--Body largest for the species (see table 1); tail long;
hind foot large; upper parts in winter pelage Ochraceous-Buff, in
summer pelage Antimony Yellow; underparts Pale Ochraceous-Buff; skull
medium in size, broad; zygomata moderately flaring; palate medium in
length; rostrum broad; nasals moderately long; maxillary teeth small.

_Comparisons._--From _Cratogeomy castanops ustulatus_, found to the
east, jucundus differs in: Body larger; tail longer; hind foot larger;
upper parts paler, more ochraceous and less rufous; skull averaging
smaller; zygomata slightly less expanded laterally; palate and nasals
shorter; squamosal breadth less; mastoid bullae less inflated,
especially in females; rostrum slightly narrower; maxillary tooth-row
shorter. From topotypes of _Cratogeomys castanops tamaulipensis_,
found to the southeast, _jucundus_ differs in: Body larger; tail
longer; hind foot smaller; upper parts, in winter pelage, paler, more
ochraceous and less rufous; skull larger; zygomata more widely
flaring; palate longer; rostrum broader; tympanic bullae more
inflated; basioccipital with sides parallel instead of convex;
maxillary teeth smaller. From _Cratogeomy castanops excelsus_, found
to the southwes