Measurements of Adult Females of Thomomys
(In millimeters)

Total
length		Length
of tail		Length
of
hind
foot		Basilar
length		Length
of
nasals		Zygomatic
breadth		Mastoid
breadth		Interorbital
breadth		Alveolar
length
of
upper
molar
series		Extension
of
premax
post. to
nasals		Length
of
rostrum		Breadth
of
rostrum
T. t. gracilis, 2; topotypes
Av. 190 58 27 29.7 12.0 19.7 17.3 6.4 7.3 1.2 14.0 6.5
Min. 185 54 27 29.5 11.9 19.7 16.9 6.3 7.2 1.1 14.0 6.4
Max. 194 61 27 29.9 12.0 19.7 17.6 6.5 7.4 1.4 14.0 6.6
T. t. oquirrhensis, 7; topotypes
Av. 203 56 27 30.2 12.9 20.4 18.2 6.8 7.5 0.8 14.8 7.2
Min. 193 52 25 28.5 12.2 19.5 17.5 6.6 6.7 0.5 14.2 6.9
Max. 215 59 28 31.5 13.3 21.0 19.1 7.2 8.0 1.0 15.5 7.5
T. t. wasatchensis, 19; topotypes
Av. 205 62 27 31.5 12.7 20.5 18.0 6.5 7.4 0.9 14.6 7.2
Min. 180 52 23 28.1 11.2 19.3 17.2 6.2 6.0 0.6 13.0 6.8
Max. 222 70 30 32.5 14.5 22.0 19.9 6.7 8.1 1.2 16.2 7.5
T. t. uinta, 2; SW slope Bald Peak, Uinta Mts.
Av. 181 49 25 28.4 11.6 19.8 17.3 6.6 7.2 1.3 13.5 6.8
Min. 177 47 25 28.3 11.6 19.8 17.2 6.4 7.0 1.1 13.3 6.8
Max. 185 50 25 28.4 11.6 19.8 17.4 6.7 7.3 1.5 13.6 6.8
T. t. moorei, 5; topotypes
Av. 206 62 26 29.9 12.8 21.5 18.4 6.6 7.3 1.3 14.6 6.8
Min. 198 55 24 29.0 12.3 21.0 18.0 6.4 7.0 1.0 14.0 6.4
Max. 213 69 28 31.2 14.1 22.5 19.1 6.8 7.5 1.6 15.6 7.0
T. t. fossor, 4; Cascade Creek, La Plata Co., Colo.
Av. 215 57 29 32.6 14.2 22.0 19.0 6.0 7.5 0.7 16.2 7.3
Min. 204 51 28 31.3 13.6 21.5 18.0 5.7 7.1 0.5 15.9 7.0
Max. 223 63 30 34.0 14.8 22.9 19.6 6.3 7.8 1.0 16.3 7.5
No. 13684 (C. M.) T. t. ravus, 1; topotype
241 71 28 35.7 14.5 24.4 21.5 6.2 7.8 2.7 17.1 8.1
No. 178868 (U. S. N. M.) T. t. pygmaeus, 1; Fossil, Wyo.
167 52 20 24.0 10.2 16.5 14.8 5.2 5.6 0.7 11.1 5.8
T. t. ocius, 3; topotypes
Av. 201 60 25 30.0 13.5 20.5 17.9 6.2 7.2 0.8 15.0 7.4
Min 196 57 25 29.9 13.0 19.9 17.5 6.1 7.1 0.5 14.7 7.3
Max. 205 64 25 30.1 14.0 21.5 18.6 6.3 7.3 1.0 15.3 7.5
T. t. parowanensis, 4; Britts Meadow, Beaver Mountains
Av. 221 58 29 33.2 14.5 22.8 19.0 6.0 7.8 0.9 15.4 7.3
Min. 207 50 28 30.5 12.8 22.7 18.6 5.8 7.4 0.5 14.7 7.0
Max. 240 66 30 34.8 15.5 23.0 19.6 6.2 8.1 1.5 17.8 7.7
T. t. levis, 2; topotypes
Av. 203 65 27 28.1 11.1 19.2 17.7 6.1 6.9 0.8 13.0 6.8
Min. 199 61 26 28.0 10.6 18.9 17.5 5.8 6.6 0.6 12.8 6.6
Max. 206 70 27 28.2 11.6 19.5 17.9 6.4 7.2 1.0 13.2 7.0

Thomomys bottae (Eydoux and Gervais)

Thomomys bottae is a southern species that, within the Great Basin, reaches the most northern limits of its distribution in Utah. The animals of this species inhabit the lower valleys, and with the exception of the Oquirrh Mountains, inhabit also the mountains in that part of the state west of the central mountain ranges. The specific characters are: Sphenorbital fissure present; incisive foramina posterior to infraorbital canal; anterior prism of P4 rounded; interparietal relatively small; lambdoidal suture straight in region of interparietal, in Utah specimens.

Thomomys bottae aureiventris Hall

Thomomys perpallidus aureiventris Hall, Univ. California Publ. Zoöl., 32:444, July 8, 1930; Univ. California Publ. Zoöl., 37:3, April 10, 1931.

Thomomys bottae aureiventris Goldman, Proc. Biol. Soc. Washington, 48:156, October 31, 1935.