370 HETEROMYS. 



BULLER'S SPINY RAT. 



Type locality. La Laguna, Sierra de Juanacatlan, State of 

 Jalisco, Mexico. Altitude, 7,000 feet. 



Geogr. Distr. High elevations, State of Jalisco, Mexico. 



Genl. Char. Size between H. alleni and H. irroratus; skull stout. 



Color. Above grizzled smoky gray and yellow; lateral line yel- 

 lowish; under parts pure white; hands and feet white; arms white to 

 elbow; hind leg dark gray on outer side, white on inner; tail brown 

 above, white beneath; ears without white edges. 



Measurements. Total length, 234; tail, 120; hind foot, 28.5; ear 

 from notch, 15. Skull: basal length, 29.5; greatest length, 34.5; 

 greatest breadth, 16.8; length of nasals, 13.5; interorbital constric- 

 tion, 8.5; length of interparietal, 4; breadth of interparietal, 6.4; 

 palatal length, 21 ; length of upper molar series, 5.3. 



377. salvini (Heteromys), Thomas, Ann. Mag. Nat. Hist., 6th Ser., 

 xi, 1893, p. 331. 



longicaudatus , Alst., Biol. Cent. Am., Mamm., i, 1880, p. 167, 



pi. xvn, fig. 2. (nee Gray.) 

 SALVIN'S SPINY RAT. 



Type locality. Duefias, Gautemala. 



Genl. Char. Size equal to that of H. bulleri; feet shorter; fur 

 spiny. 



Color. General hue grizzled black and yellowish above; under 

 parts pure white; outer sides of forearm slaty gray; tail brown above, 

 whitish below. 



Measurements. Total length, about 210; tail, 95; hind foot, 26.5. 

 Skull: basal length, 28; greatest length, 33.6; greatest breadth, 15.2; 

 length of nasals, 13.1; interorbital constriction, 7.6; length of inter- 

 parietal, 4.5; breadth of interparietal, 10.2; palatal length, 19.2; 

 length of upper molar series, 4.4. 



a. nigrescens (Heteromys}, Thomas, Ann. Mag. Nat. Hist., 6th 



Ser., xii, 1893, p. 234. 

 BLACK SPINY RAT. 



Type locality. Costa Rica. 



Genl. Char. Similar to H. salvini, but dorsal region uniform in 

 color. 



Color. Above dark uniform smoky brown; a few yellow-tipped 

 hairs on sides ; lateral line absent ; limbs dark gray ; under parts white ; 

 tail above brown, beneath white. 



Measurements. Length of head and body, 127; tail incomplete; 

 hind foot without claws, 25. "Skull: greatest length, 32.7; greatest 

 breadth, 15.4; length of nasals, 3.8; interorbital constriction, 6.8; 



