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., 
Nowe cregs; p. 676, Ge: 63. 
NELSON’s PockEeT 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; premaxille 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., x11, 
1894, Pp. 437- 
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 vertebrz, 103.5; hind foot, 
50. Skull: basal length, 60.5—64; Hensel, 55.5—59.5; zygomatic width, 
37-42; interorbital width, 14.2-16; 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, p. 
178, pl. 11, and figs. 5, 6; text fig. 64. 
BristLED PocKEeT 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. 
