396 PLAGIODONTIA. 
slightly smaller, with one external and two internal loops, the angle 
on latter much shallower than the others; lower incisors enter jaw 
to base of last molar. 
414. aedium (Plagiodontia), F. Cuv., Ann. Scien. Nat., 2me Sér., v1, 
E830; P- 347, Dla £7,-L00L 
Haitian Hotta. 
Type locality. Island of Haiti. 
Geogr. Distr. Island of Haiti. 
Genl. Char. Those of the genus. 
Fic. Lill. PLAGIODONTIA AEDIUM. HAITIAN HuTIA. 
ex Ann. Scien. Nat., Paris, 1836, Pl. 17. 
Color. General hue pale brown; hairs on upper parts gray for 
three-fourths their length, and fawn at the tips; long black hairs are 
intermingled with the others; hairs of under parts are paler than 
those of the back, and the long hairs are whitish; tail naked, scaly; 
incisors yellow. 
Measurements. Total length, 425; tail, 125. Skull: occipital 
region imperfect; posterior border of frontal to end of nasals, 52; 
interorbital constriction, 19; zygomatic width, 42; length of nasals, 
23.5; length of upper molar series, alveolar border, 21; length of 
mandible, angle to alveolus of incisor, 48; height at coronoid process, 
23; length of lower molar series, alveolar border, 22. 
Of the Family of ‘‘fretful porcupines,’’ the semi-arboreal species 
of the genus ERETHIZON are found in North America. They prefer 
a cold climate, and if their lot is cast in tropical lands, such as Mexico, 
