Pocket gophers were taken at four localities from north to south in eastern Juab County. They range in color from Ochraceous Tawny on the upper parts and Cinnamon Buff on the underparts to shades that are slightly lighter. All are much lighter than topotypes of albicaudatus. The general configuration of the skull is the same as that of albicaudatus, and this is especially true in the females. In the narrower rostrum and weaker dentition they approach contractus, but are distinctly lighter colored. Hall (1931:3) referred one specimen from Nephi, Juab County, to Thomomys bottae aureiventris. Since that time Thomomys bottae lenis which has some affinities with aureiventris has been described (see account of contractus). The large series now available from Nephi and nearby localities do show some intergradation with lenis, in that four characters are more as in lenis and contractus and seven characters are more as in albicaudatus. Although differing markedly in many respects from topotypes of albicaudatus they fit the aforementioned concept of this subspecies, and are being treated as a variable local population of it.
Provo is the locality listed for specimens which were available to naturalists from 1875-1877. To these specimens the following names were applied: Thomomys talpoides bulbivorus Coues (1875:256; 1877:627) and Thomomys talpoides umbrinus Coues and Yarrow (1875:112). Possibly these names were applied to the animals currently known as Thomomys bottae albicaudatus which does occur at Provo. Without the opportunity to examine the actual specimens, which so far as I know are no longer in existence, I cannot exclude the possibility that the locality designation "Provo" was used in a general sense to include pocket gophers taken a few miles to the eastward of Provo, where it is known that pocket gophers of only the species Thomomys talpoides (current terminology) occur.
Specimens examined.—Total, 239, distributed as follows: Davis County: Bountiful, 4,500 ft., 1. Salt Lake County: Salt Lake City and environs, 4,300 ft., 51; 2 mi. W Murray, 4,300 ft., 6; Riverton, 4,300 ft., 11; Draper, 4,500 ft., 7; Rose Canyon, Oquirrh Mountains, 5,650 ft., 4. Tooele County: Bauer, 4,500 ft., 30; Settlement Creek, Oquirrh Mountains, 6,500 ft., 1; St. John, 4,300 ft., 28; Clover Creek, Onaqui Mountains, 5,500 ft., 15; Vernon, 4,300 ft., 2 (U. S. A. C.); Little Valley, Sheeprock Mountains, 5,500 ft., 20. Utah County: Fairfield, 4,800 ft., 24; Provo, 4,400 ft., 20 (8, B. Y. U.; 12, M. V. Z.). Juab County: Neff Farm, 4 mi. N Nephi, 5,000 ft., 2 (1, R. H.); Nephi, 5,000 ft., 1 (M. V. Z.); 2 mi. S Nephi, 4,700 ft., 14; 7 mi. SW Nephi, 6,000 ft., 2.
Thomomys bottae bonnevillei new subspecies
Type.—Male, adult, skin and skull, No. 3576, Museum of Zoölogy, University of Utah; Fish Springs, 4,400 ft., Juab County, Utah; June 8, 1940; collected by S. D. Durrant; original number 1955.
Range.—Known only from the type locality.
Diagnosis.—Size medium (see measurements); claws on front feet small. Color: Entire dorsal surface Warm Buff; sides near (e) Cinnamon Buff, underparts near (16") Pale Pinkish Buff; inguinal region, front and hind feet and distal part of tail white: top of head, nose and cheeks grayish black; postauricular patches small and grayish black; ears small, pointed and with heavily pigmented pinnae. Skull: Angular, short and wide; nasals of medium length, narrow proximally but widely flared distally; interparietal small; lambdoidal suture concave towards the interparietal; zygomatic arches uniformly widely spreading; interpterygoid space widely V-shaped; extension of premaxillae posterior to nasals long; lambdoidal crest well developed.
Comparisons.—From topotypes of Thomomys bottae aureiventris, bonnevillei differs as follows: Size smaller, hind foot shorter. Color: Upper parts and sides lighter; underparts pale buff rather than "gold." Skull: Shorter and relatively wider; rostrum wider and heavier; zygomatic arches relatively wider and more massive, with greatest width posteriorly instead of anteriorly; interpterygoid space widely V-shaped rather than lyre-shaped; thickening at union of jugal and zygomatic process of maxilla less developed; anterior palatine foramina larger; nasals shorter and more markedly flared distally; zygomatic breadth relatively, and mastoidal breadth actually, wider; extension of premaxillae posterior to nasals greater; tympanic bullae more inflated ventrally; upper incisors wider.
From near topotypes of Thomomys bottae centralis, from 1 mile east of Garrison, Millard County, Utah, bonnevillei differs as follows: Size smaller; hind foot and tail shorter. Color: Generally darker above and lighter below; top of head darker; postauricular patches smaller and lighter. Skull: Shorter and wider (zygomatic breadth expressed in percent of basilar length being, in males, 74.5 in bonnevillei and 71.5 in centralis); interpterygoid space more widely V-shaped; interparietal smaller, and more triangular; nasals shorter and much more dilated distally, as well as more constricted proximally; lacrimal processes smaller and less globuse at tips; temporal fossae larger; braincase and entire dorsal surface of skull more nearly flat; lambdoidal suture convex posteriorly as opposed to nearly straight; tympanic bullae more inflated ventrally.