612 MONOGRAPHS OF NORTH AMERICAN RODENTIA. 
ANALYSIS OF SPECIES. 
A. Superior incisors bisuleate ; fore claws and pouches at a maximum. 
a. Incisors almost exactly bisected by the main groove, the fine marginal groove 
Gustin cts tant enna ee tee ea at BURSARIUB. 
b. Incisors unequally divided by the main groove into larger inner and smaller outer 
portion, the fine marginal groove faint or obsolete; tail and feet nearly 
naked (South Atlantic and Gulf States).----- 2222-220. .-..5. -----5 -2o=-- TUZA. 
B. Superior incisors unisuleate ; fore claws and pouches moderate. 
a. Incisors exactly bisected by the groove; fur soft; tail and feet hairy. 
a’. Smaller ; yellowish-brown, below whitish (United States)............----- CASTANOPS, 
v’. Larger; dark reddish-brown, below plumbeous (Mexico)......---.....---- MEXICANUS, 
b. Incisors unequally divided by the groove into a small inner and large outer 
portion ; pelage very hispid; tail and feet nearly naked........-.-...-.. IISPIDUS. 
GEOMYS BURSARIUS, (Shaw) Rich. i 
Common Pocket Gopher. 
Mus bursarius, Suaw, Linn. Trans. v, 1800, 227, fig. 8; Gen. Zool. ii, 1801, 100, pl. 138 (the plate clearly, 
shows the grooved incisors; the pouches are everted).—MITcuILL, Am. Journ. Sci. iv, 1822, 183 
(relating to the pouches). 
Cricetus bursarius, DesM., ‘Nouv. Dict. d’Hist. Nat. xiv, —, 177; Ency. Méth. Suppl. pl. 10, f.4”; Mamm. 
ii, 1822, p. 312 (“‘bursareus”).—F. Cuv., “ Dict. Se. Nat. xx, ——, 257”.—DEsSMOUL., “ Dict. 
Class. viii, ——, 37”.—Grirr., “Anim. Kinga iii, 1827, 138, pl. —”; v, 1827, 235, no. 612. 
Saccophorus bursarius, Kuur, Beitriige, 1820, 65.—Fiscu., Synop. 1827, 304. 
Pseudostoma bursarius, Say, Long’s Exp. R. Mts. i, 1828, 406 (‘‘ bursaria”’).— Hanan, Fn. Amer. 1825, 
153.—Less., Man. 1827, 259.—GopMan, Am. Nat. Hist. ii, 1831, 90 (“bursarium”).—DrEKay, 
N. Y. Fn. i, 1842, 92.—Aup. & Bact, Q. N. A. i, 1849, 332, pl. 44, 
Geomys? bursarius, Ricu., F. B. A. i, 1829, 203. 
Geomys bursarius, Ricu., Sixth Ann. Rep. Brit. Assoe. Adv. Sci. for 1836, 1837, 150.—Woonpn., Sitgr. Rep. 
Zuni and Col. R. 1853, 50 (Indian Territory ).—Parvin, Ann. Rep. Smiths. Inst. for 1854, 1855, 
293 (habits).—Kenn., Trans. Illinois Agric. Soc. for 1853-54, 1855, 580.—Bp., M. N. A. 1857, 
372, pl. 22, f. 1 a-h, and pl. 50, f. 2 a-g.—Maxim., Arch. Naturg. 1861, ——; Verz. Reise 
N. oo Sune 1862, 147.—Grrr., Cat. Bones Br. Mus. 1862, 223.—Leipy, Proc. Acad. Nat. 
Sci. Phila. 1867, 97 (skull from loess of Missouri).—AmeEs, Bull. Acad. Minnesota, i, 1874, 
70.—Cours, Proce, Phila. Acad. 1875, 131; Powell’s Rep. Colorado R. 1875, 221 (monographic), 
Ascomys bursarius, Eyp. & Grry., Voy. Favorite, v, 1839, 23.—Scminz, Syn. ii, 1845, 132.—Girn., Odon- 
tog. 53, pl. 23, f. 8. 
Geomys (Saccophorus) bursarius, GIEB., Siiug. 1855, 529. : 
? Mus ludovicienus, ORD, “Guthrie’s Geog. 2d Am. ed. ii, 1815, 292. (Not determinable.) ” 
? Diplostoma fusca, Rav., Am. Montb. Mag. ii, 1817, 44.—Drsm., Mamm. ii, 1822, 315.—Lxss., Man. 1827, 261. 
? Diplostoma alba, Rav., Am. Month. Mag. ii, 1817, 44 (albino).—Drsm., Mamm. ii, 1822, 315.—Lxss., Man. 
1527, 261. 
Saccophorus ? albus, Fiscu., Synop. 1827, 305. 
? Geomys cinereus, Rav., Am. Month. Mag. ii, 1817, 45. 
Mus saccatus, Mircn., N. Y. Med. Repos. xxi (new ser. vol. vi), 1821, 249 (from Lake Superior. ‘‘The Es 
pber, or Pouched Rat of North America, (Mus bursorius.)”) 
Ascomys canadensis, Licut., Abk. Acad. Wiss. Berl. 1823, 13, fig—BRranTs, Muizen, 1827, 24. —Wacn. 
“Suppl. Sehreb. iii, 1843, 383; Abh. K. Baier. Akad. Miinch. xxii, 1846, 327, fig. (skeleton) ”. 
Geomys canadensis, LEC., Proc. ene Nat. Sei. Phila. vi, 1852, 153. . 
Geomys drummondii, Ricu., Sixth Ann. Rep. Brit. Assoc. for 1836, 1837, 157 (Texas. A species with double- 
grooved incisors, apparently exactly equal to what was afterward called breviceps by Baird). 
alscomys drummondii, WAGNER, “ Suppl. Schreber”. 
Geomys oregonensis, LuC., Proc. Acad. Nat. Sci. Phila. vi, 1852, 160 (no probability that the assigned locality 
is correct). 
Geomys breviceps, Bp., Proc. Acad. Nat. Sci. Phila. 1855, 334; M. N. A. 1857, 378, pl. 52, f. 2 a-g (Texas).— 
Grrr., Cat. Bones Br. Mus. 1862, 223. ; 
Canada Rat, Suaw, ll. ce. 
Canada Pouched Rat, Rrciwarpson, 1. c—AUD. & Bact, l. ¢. 
