:153) placed
_beatae_ in synonymy under _P. b. levipes_ because Mount Orizaba (type
locality of _beatae_) is "relatively very near" Mount Malinche (type
locality of _levipes_), and Thomas had not compared _beatae_ with
_levipes_. Xometla, on the east side of the Volcan de Orizaba, is
approximately 56 miles east of the Tlaxcalan part of Mount Malinche and
is situated where the Tropical Life-zone begins, whereas Mount Malinche
is in the Austral Life-zone on the Mexican Plateau; the difference in
habitat between the two places is great. Topotypes of _levipes_ differ
from two topotypes of _beatae_ in the same fashion as do other specimens
of _levipes_ (from San Luis Potosi) from other specimens of _beatae_
(from Veracruz). Unfortunately, the topotypes of _beatae_ lack external
measurements and are subadults, but their coloration agrees with that of
other specimens that are here referred to _beatae_.

Hall and Kelson (1959:634, map 364) incorrectly mapped the distribution
of _levipes_ in Veracruz. There are at least two places named Xuchil in
the state of Veracruz and Hall and Kelson (_loc. cit._) unfortunately
plotted the one at lat. 20 deg. 42' N, long. 97 deg. 42' W whereas the specimens
actually were collected at the Xuchil on the pleateau south of the
Volcan de Orizaba (18 deg. 53' N, 97 deg. 14' W) in the west-central part of
Veracruz. The specimens from Xuchil are _P. b. beatae_.

Intergradation in color between the two subspecies _levipes_ and
_beatae_ is seen in specimens from Jalapa and Zacualpan (3 km. N, also
others from 3 km. W), Veracruz. Intergradation between these two
subspecies possibly will be found elsewhere along the Sierra Madre
Oriental.

_Specimens examined._--Total 60 as follows: VERACRUZ: 1 km. E
Jalancingo, 6500 ft., 2; _2 km. S Jalancingo_, 2; 6 km. SSE
Altotonga, 8000 ft., 8; _1 km. W Las Vigas, 8500 ft._, 2; Las
Vigas, 8500 ft., 13; _2 km. E Las Vigas, 8000 ft._, 5; _3 km. E
Las Vigas, 8000 ft._, 8; _5 km. E Las Vigas_, 7 (TAM); _5 km. N
Jalapa, 4500 ft._, 2; _Jalapa_, 1 (USNM); 10 km. SE Perote, N
slope Cofre de Perote, 10,500 ft., 1 (TAM); Xometla Camp, Mt.
Orizaba, 8500 ft., 2 (BM); _Sta. Barbara, Mt. Orizaba, 12,000
ft._, 1 (BM); Xuchil, 6 (CM).

#Peromyscus boylii ambiguus# new subspecies

_Type._--Male, adult, skin and skull, No. 33092, United States
National Museum, from Monterrey, Nuevo Leon; obtained on
February 17, 1891, by Wm. Ll