324 ORTHOGEOMYS. 
Measurements. Total length, 320; tail, 135; hind foot, 57. Skull: 
basal length, 68; Hensel, 62; zygomatic width, 43.8; interorbital 
width, 15; length of upper molar series, 16.5; length of single half 
of mandible, 49. 
323. nelsoni (Orthogeomys), Merr., Mon. Geomyide, N. Am. Faun., 
NOS, )13655-)-117 0s e.n0ge 
NELSON’s PocKET GOPHER. 
Type locality. Mount Zempoaltepec, State of Oaxaca, Mexico. 
Altitude, 8,000 feet. 
Geogr. Distr. Mount Zempoaltepec and adjacent region, State of 
Oaxaca, Mexico. 
Genl. Char. Size large; ears large; tail, except base, naked. Skull 
very large, long; nasals very narrow posteriorly ; premaxilla reaching 
far beyond posterior end of nasals; interorbital constriction slight; 
frontal narrow, short. 
Color. General hue dark brown; slightly paler below. 
Measurements. Total length, 397; tail vertebre, 123; hind foot, 
53. Skull: basal length, 70; Hensel, 64; zygomatic width, 44-45; 
interorbital width, 16-17; length of upper molar series, 15; length 
of single half of mandible, 50-51. 
324. scalops (Geomys), Thomas, Ann. Mag. Nat. Hist., 6th Ser., x111, 
LO OA. e437. 
DicGER PocKEeT GOPHER. 
Type locality.: Tehuantepec, State of Oaxaca, Mexico. 
Geogr. Distr. State of Oaxaca, and possibly in State of Chiapas, 
Mexico. 
Genl. Char. Size large; nasal pad, tail, and hind feet naked. 
Color. General color dark seal brown, nearly black. 
Measurements. Total length, 369; tail vertebra, 103.5; hind foot, 
50. Skull: basal length, 60.5—-64; Hensel, 55.5-59.5; zygomatic width, 
37-42; interorbital width, 1r4.2-16; length of upper molar series, 
13-14.5; length of single half of mandible, 43.5—46.5. 
325. latifrons (Orthogeomys), Merr., N. Am. Faun., No. 8, 1895, Pp. 
178, pl. 11, and figs. 5, 6; text fig. 64. 
BrISTLED POCKET GOPHER. 
Type locality. Guatemala. Exact locality unknown. 
Geogr. Distr. Guatemala. Range unknown. 
Genl. Char. Pelage bristly; tail long, naked; feet scantily haired ; 
incisors with nearly median groove; zygomata narrow, slender, 
broadest posteriorly; nasals short, narrow. 
Color. Uniform dull sooty brown above and below. 
Measurements. Total length, 320; tail, roo; hind foot, 39. 
