HETEROGEOMYS. MACROGEOMYS. 83 



graduated to acute point; incisors large, heavy, curved; mandible 

 heavy, compact. 



Color. Entire upperparts and sides blackish seal-brown; under- 

 parts dark hair-brown ; numerous white hairs on rump at base of tail and 

 all over the underparts, the base of tail being almost white; hands 

 and feet very dark seal-brown; tail blackish, naked; claws very long, 

 curved, horn-color. Ex type in Field Museum of Natural History. 



Measurements. Total length, 361; tail, 90; hind foot, 54; ear, 10. 

 Skull: Total length, 64; Hensel, 51; zygomatic width, 41.5; inter- 

 temporal width, 14; palatal length, 39.; length of nasals, 26; width 

 posteriorly, 6; width anteriorly, 10; length of upper molar series, 14; 

 length of mandible to tip of incisors, 53; length of lower molar series, 

 13. Ex type in Field Museum of Natural History. 



Genus Macrogeomys (92). 

 Large Pocket Gophers. 



Macrogeomys matagalpae Allen. 



Macrogeomys matagalpa Allen, Bull. Amer. Mus. Nat. Hist.,, 



XXVIII, 1910, p. 97. 

 Type locality. Pena Blanca, Matagalpa, Nicaragua. 



Macrogeomys dariensis Goldman. 



Macrogeomys dariensis Goldm., Smith. Misc. Coll., LX, No. 2, 1912, 

 p. 8. 



Type locality. Cana, eastern Panama. . Altitude, 2000 feet. 



Genl. Char. Similar in size to M. cavator, tail longer; skull longer, 

 narrower posteriorly; braincase and rostrum narrower; third upper 

 molar shorter, heel less produced ; incisors narrower. 



Color. Head and upperparts chocolate-brown; rest of body nearly 

 devoid of hair, only some scattering light brown ones; hands, feet and 

 tail brownish. Ex type in United States National Museum. 



Measurements. Total length, 401; tail, 132; hind foot, 53.5. 

 Skull: Total length, .69.3; Hensel, 61.6; zygomatic width, 44.7; inter- 

 temporal width, 10.9; length of nasals, 27.8; length of upper molar 

 series, 15.1; length of mandible, 48.2; length of lower molar series, 

 13.6. Ex type in United States National Museum. 



