HETEROGEOMYS. 325 



<>7. Heteroffcomys. Distinct Pocket Gophers. 



Heterogeomys Merr., Mon. Geomyidae, N. Am. Faun., No. 8, 1895, 

 p. 179, pis. and figs. Type Gcomys hispidns Le Conte. 



Skull high, narrow; zygomata moderately wide; frontal broad 

 and flat; orbital plate of frontal usually perforated by a foramen 

 above apex of sphenoidal fissure; nasals much arched anteriorly; 

 squamous part of occipital plane high above mastoid bullae; orbito- 

 sphenoids narrow and long, not articulating with alisphenoids; upper 



FIG. 61. HETEROGEOMYS TORRIDUS. 



No. 5843 Field Columbian Mus. Coll. Nat. si/r. 



