i-24 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. Geomyidae, N. Am. Faun., 



No. 8, 1895, p. 176, fig. 63. 

 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; premaxillae 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 vertebrae, 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. sea lops (Geomys), Thomas, Ann. Mag. Nat. Hist., 6th Ser., xin, 



1894, p. 437. 

 DIGGER POCKET 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 vertebrae, 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, pi. ii, 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, TOO; hind foot, 39. 



