PLATYGEOMYS. 319 



317. tylorhinus (Platygeomys), Merr., Mon. Geomyidae, N. Am. 



Faun., No. 8, 1895, p. 167, pi. 13, fig. i. 

 TOUGH-SKINNED POCKET GOPHER. 



Type locality. Tula, State of Hidalgo, Mexico. 



Geogr. Distr. States of Hidalgo and Michoacan, on north slope 

 of the Sierra Madre, Mexico. 



Genl. Char. Size large, similar to P. gymnurus, but smaller; skull 

 lighter and smaller; nasals broad posteriorly and truncate. 



Color. Upper parts liver brown; under parts paler, plumbeous 

 base of hairs showing; hind feet white. 



Measurements. Total length, 345; tail vertebrae, 100; hind foot, 



45. Skull: basal length, 48-60; Hensel, 45-57; zygomatic width, 

 40-46; interorbital width, 7.5-9; length of upper molar series, 12-13; 

 length of mandible, 46-52. 



a. (i/io-/txtirostj'is (Platygcomys), Merr., Proc. Biol. Soc. Wash., 1903, 



p. 81. 

 SLENDER-NOSED POCKET GOPHER. 



Type locality. Patamban, State of Michoacan, Mexico. 



Genl. Char. Similar to P. tylorhinus, but paler. Skull smaller; 

 rostrum, nasals, and incisors narrower and arched posteriorly. 



Color. Above pale fulvous grizzled with black ; beneath pale slaty 

 plumbeous washed with pale fulvous. 



Measurements. Body measurements not given. Skull: basal 

 length, 53.5; zygomatic width, anteriorly, 38; breadth of rostrum, 

 anteriorly, 10; breadth of nasals, anteriorly, 6; at middle, 3. 



318. planiceps (Platygeomys) , Merr., Mon. Geomyidae, N. Am. Faun., 



No. 8, 1895, p. 168, pi. 13, fig. 3; pi. 14, fig. 9. 

 FLAT-HEADED POCKET GOPHER. 



Type locality. North slope of the Volcano Toluca, State of 

 Mexico, Mexico. Altitude, 8,600 feet. 



Geogr. Distr. Volcano Toluca to City of Toluca, State of Mexico. 



Genl. Char. Similar to P. tylorhinus; tail longer. Jugal narrow 

 and slightly expanded; upper incisor with single sulcus. 



Color. Above chestnut; under parts paler; hind feet whitish; 

 black spot around ear. 



Measurements. Total length, 372; tail vertebrae, 121; hind foot, 



46. Skull: basal length, 52.5-59; Hensel, 49-55; zygomatic width, 

 38-42.5 ; interorbital width, 7.5-8; length of upper molar series, 12-13 ; 

 length of single half of mandible, 46-51. 



319. neglectus (Platygeomys}, Merr., Proc. Biol. Soc. Wash., xv, 1902, 



p. 68. 



