316 CRATOGEOMYS. PLATYGEOMYS. 



30-38; interorbital width, 6.5-7.5 ; length of upper tooth row, 9.5-10.5 ; 

 length of single half of mandible, 31.5-38. 



a. goldmani (Cratogeomys] , Merr.,Mon. Geomyidas, N. Am. Faun., 



No. 8, 1895, p. 160. 

 GOLDMAN'S POCKET GOPHER. 



Type locality. Canitas, State of Zacatecas, Mexico. 



Geogr. Distr. State of Zacatecas, Mexico. 



Genl. Char. Similar to C. castanops in coloration. Skull : rostrum 

 shorter than that of C. castanops; braincase broader; basioccipital 

 somewhat larger. 



Color. Above mixed black and buffy ochraceous; under parts 

 paler. 



Measurements. Total length, 270; tail vertebrae, 83; hind foot, 

 34. Skull: basal length, 44.5-46; Hensel, 41-42.5; zygomatic width, 

 32-32.5; interorbital width, 7.5; length of upper molar series, 9-9.5; 

 length of single half of mandible, 31-32.5. 



314. fulvescens (Cratogcomys), Merr,, Mon. Geomyidas, N. Am. 



Faun., No. 8, 1895, p. 161, pi. 12, fig. 2. 

 FULVOUS POCKET GOPHER. 



Type locality. Chalchicomula, State of Puebla, Mexico. 



Geogr. Distr. States of Puebla and Tlaxcala, from "Esperanza 

 north to Perote and west to the northeast base of Mount Malinche, 

 in Tlaxcala," Mexico. 



Genl. Char. Similar to C. castanops, but larger and darker; 

 superior outline of skull convex; fronto maxillary suture reaching 

 anteriorly the plane of the front of the zygoma. 



Color. Above mixed yellowish brown and blackish; under parts 

 ochraceous buff. 



Measurements. Total length, 318; tail vertebrae, 102; hind foot, 

 43. Skull: basal length, 49-55; Hensel, 45-50.5; zygomatic width, 

 34-40; interorbital width, 6.5-8; length of upper molar series, 10-12; 

 length of single half of mandible, 35-38. 



64. Platygeomys. Broad-headed Pocket Gophers. 



Platygeomys Merr., Mon. Geomyidas, N. Am. Faun., No. 8, 1895, 

 p. 162, pis. and figs. Type Geomys gymnurus Merriam. 



Skull large, massive, flat; squamosals expanded laterally, giving 

 considerable width to the occipital region, concealing the postglenoid 

 notch, and increasing the glenoid fossa; zygomata heavy and widely 

 spread; jugal large and broad; endoturbinals forming an elongated 



