3-2-2 PAPPOGEOMYS. ORTHOGEOMYS. 



WHITE-NOSED POCKET GOPHER. 



Type locality. Atemajac, a suburb of Guadalajara, State of Jalisco, 

 Mexico. 



Geogr. Distr. State of Jalisco, Mexico. Altitude, 4,000 to 5,100 

 feet. 



Genl. Char. Size small; nasal pad and tail naked. Skull similar 

 to that of P. bulleri, but generally larger'; 



Color. General color of whole body pale plumbeous tinged with 

 chestnut ; palest on under parts ; white patch on nose reaching nearly 

 to eyes. 



Measurements. Total length, 226; tail vertebrae, 68; hind foot, 

 31. Skull: basal length, 36.5; Hensel, 33; zygomatic width, 25.5; 

 interorbital width, 7.5; length of upper molar series, 9.5; length of 

 single half of mandible, 26.5. 



66. Orthogeomys. Straight-headed Pocket Gophers. 



Orthogeomys Merr., Mon. Geomyidae, N. Am. Faun., No. 8, p. 172, 



pi. and figs. Type Geomys scalops Thomas. 



Skull elongated, flat; frontal broad; orbital plates of frontal sepa- 

 rated by orbitosphenoids ; braincase subcylindrical ; interorbital con- 

 striction lacking; upper premolar with three or four enamel plates; 

 upper incisor with one open sulcus. 



KEY TO THE SPECIES. 



A. Pelage not bristly ; nasal pad large. PAGE 



a. Nasals long, broad posteriorly ................ O. grandis 322 



b. Nasals long, narrow posteriorly. 



a/ Premaxillae very broad, inclined to a point 



posteriorly, on a line with the orbits ......... O. nelsoni 324 



b/ Premaxillae narrower, truncate posteriorly, 



not reaching the orbits .................... O. scalops 324 



B. Pelage bristly; nasal pad small or absent ........ O. latifrons 324 



322. grandis (Geomys), Thomas, Ann. Mag. Nat. Hist. ,6th Ser., xn, 



1893, p. 270. 

 GIANT POCKET GOPHER. 



Type locality. Duenas, Guatemala. 



Genl. Char. Size large; fur coarse. Skull large, heavy ; premaxillae 

 longer than nasals posteriorly; interorbital space broad, its edges 

 rounded anteriorly and inflated; incisors pale yellow, with a deep 

 groove; molars large. 



