386 PROECHINOMYS. 
404. semispinosus (Ec/imys!), Tomes, Proc. Zodl. Soc., 1860, p. 265. 
SHORT-SPINED Rat. 
Type locahty. Ecuador. 
Geogr. Distr. Nicaragua south to Ecuador. 
Genl. Char. Size large; ears small; tail half as long as head and 
body; long and strong claws on hands and feet; spines short, flexible, 
confined to middle of back. 
Color. Above mixed reddish brown and black; cheeks, sides of 
neck, and body paler; orbital ring black; under parts white; tail 
above black, beneath ashy brown; hands and feet ashy brown. 
Measurements. Total length, 370-400; tail vertebrz, 140-169; 
hind foot, 47-55; ear, 18-19. Skull: total length, 57; zygomatic 
breadth, 29; upper tooth row, 16; length of nasals, 21. 
FiG. 72. PROECHINOMYS CENTRALIS. 
No. 23252 U.S. Nat. Mus. Coll. Nat. size. 
405. centralis (Echinomys), Thomas, Ann. Mag. Nat. Hist., 6th Ser., 
VILL, LOOP: al 2. 
