COUES ON GEOMYS AND THOMOMYS G. CASTANOPS. 283 
but we must wait for this to occur, and be attested by Intergrading specimens, 
before we need hesitate to describe G. tuza as a "distinct species." 
The earliest notice specially referable here appears to be the unmistak 
able description by S. L. Mitchill of the "Hamster of Georgia," and various 
allusions are made by other writers to the same animal The Mus tuza * of 
Ord unquestionably belongs here^ being based upon Mitchill's animal A 
short though expressive diagnosis is given by Rafinesque, with unwonted 
accuracy, of Geomys pinetis. This name, or its emended form G. pineti, 
has been generally applied, excepting by Audubon and Bachman, who, ignor 
ing Rafinesque, rename the animal Jloridana, and refer it to Say's genus 
Pseudostoma. The species puts in the customary second-hand appearance 
under the supervision of several systematic compilers, few, if any, of 
whom appear to have had much knowledge of their own upon the subject. 
The geographical distribution of the species is remarkably limited. I 
have no knowledge of its occurrence anywhere excepting in Georgia, 
Florida, and Alabama. The Savannah River is said to form a complete bar 
rier to its northward extension. Its westward limit is not so precisely defined ; 
but it does not appear to reach to the Mississippi, where the other species is 
found. 
Audubon and Bachman have nothing particular to say of the habits of 
this species in comparison with G. bursarius, beyond the statement that it 
does not become dormant in winter. The best account of its habits, ancj 
particularly of its mode of constructing its underground galleries, is Dr. 
Gesner's article above quoted. 
GEOMYS CASTANOPS, (Bd.) Lee. 
Psfudostoma castanops, BAIRD, Stansbury's Rep. Great Salt Lake, 1852, 313. AUD. & BACH., Q. N. A. 
Hi, 1854, 304. 
Geomys casianopa, LEG., Proc. Acad. Nat. Sci. Phila. 1852, 163. BAIRD, M. N. & 1857, 381. BAIRD, P. R. R. 
Rep. x, 1859, Gunnisou and Beckwith'a Route, Mamm. 8, pi. 10, f. 2. 
Geomys clarkii, BAIRD, Proc. Acad. Nat. Sci. Phila. 1855, 332. BAIRD, M. N. A. 1857, 383, pi. 50, figs, la-g. 
KENNERLY, P. R. R. Rep. x, 1859, Whipple's Route, Mamm. 13. BAIRD, U. S. Mex. Bound. 
Survey, ii, pt. ii, 1859, Mamm. p. , . GERE., Cat. Bones Br. Mus. 1862, 222. 
Chestnut-faced, and Pecos Gopher, BAIRD, II. oc. 
DIAGNOSIS. Superior incisors with a single median groove bisecting the 
face exactly. Fore feet shorter, or not 'longer than hind feet ; these and the 
* Evidently the same word as tuya, iuza, tucatt, &c. 
30 COL 
