326 HETEROGEOMYS. MACROGEOMYS. 



part of optic foramen disappearing in advanced life; squamosal 

 expansion slight; fronto-maxillary suture reaching orbit in front of 

 lachrymal, (ex Merr., 1. c.) 



KEY TO THE SPECIES, PAGE 



A. Nasals long, narrowing rapidly posteriorly; 



zygomata not greatly spreading H. hispidus 326 



B. Nasals shorter, broader posteriorly; zygomata 



widely spreading H. torridus 326 



326. hispidus (Heterogeomys), Le Conte, Proc. Acad. Nat. Scien. Phil., 



1852, p. 158, pis. and figs. 

 HARSH-COATED POCKET GOPHER. 



Type locality. Near Jalapa, State of Vera Cruz, Mexico. 



Geogr. Distr. State of Vera Cruz, Mexico, at 4,000 to 4,500 feet 

 altitude. 



Genl. Char. Size large; upper incisors with one deep sulcus each 

 on inner side; nose pad and tail naked. 



Color. General hue above dark seal brown; under parts slightly 

 paler. 



Measurements. Total length, 345; tail vertebrae, 92; hind foot, 

 47.3. Skull: basal length, 55-57.5; Hensel, 51-53; zygomatic width, 

 36-45; interorbital width, 10-11.5; length of upper molar series, 

 13.5-14; length of single half of mandible, 38-42. 



327. torridus (Heterogeomys}, Merr., Mon. Geomyidae, N. Am. Faun.. 



No. 8, 1895, P- I ^3 pis- an d figs. 

 TROPICAL POCKET GOPHER. Tultusia in Guatemala. 



Type locality. Chichicaxtle, State of Vera Cruz, Mexico. 



Geogr. Distr. Lowlands, State of Vera Cruz, through States of 

 Oaxaca and Chiapas, Mexico, into Guatemala. 



Genl. Char. Similar to H. hispidus; size large. Skull broad 

 and heavy. 



Color. Dark seal brown, slightly paler below. 



Measurements. Total length, 323; tail vertebrae, 88; hind foot, 

 52. Skull: basal length, 54-60; Hensel, 50-55.5; zygomatic width, 

 37-43.5; interorbital breadth, 10.5-11; length of upper molar series, 

 13-14.5; length of single half of mandible, 38-42. 



68. Macrogeomys. Large Size Pocket Gophers. 



T I-1 - p ' T - M 3-3 _ Q 

 A-*-,. ^-J=I M - 3 - 3 - 20 - 



Macrogeomys Merr., N. Am. Faun., No. 8, 1895, p. 185, pis. and 



figs. Type Geomys heterodus Peters. 

 Size large ; large naked nasal pad ; tail naked ; pelage silky. Skull : 



