PROECHINOMYS, BBT 
NICARAGUAN SPINy Rat, 
Type locality, San Emilio, north end of Lake Nicaragua, Nicaragua. 
Geogr, Distr. Costa Rica, Nicaragua. 
Genl, Char, Similar to P. semispinosus, but brighter colored; 
nasals pointed posteriorly; zygomata broad; pterygoid processes 
broad, spatulate. 
Color. Similar to P, semispinosus, ‘but brighter and richer, less 
heavily black-lined on the back, and with the spineless fur of the 
sides and rump much brighter rufous; hands and feet dull whitish 
above, the darker mark which runs along the outer side of the meta- 
tarsal in some species little marked,’’ (Thomas, 1. ¢.) 
Measurements, Total length, 437; tail, 170; hind foot, 55 
(dried skin). Skull: basal length, 47.5; basilar length, 41; greatest 
breadth, 26.5; length of nasals, 21.3; width of nasals, 6; interorbital 
constriction, 12.5; breadth of interparietal, 12.5; Hensel, 20; length 
of palatine foramina, 5; width, 2.5; length of upper molar series, 9.2; 
length of mandible, condyle to the incisor, 34. 
a.—chiriquinus (Proechimys!), Thomas, Ann. Mag. Nat. Hist., 7th 
Ser., V, 1900, p. 220. 
BoGAva Spiny Rat, 
Type locahty, Bogava, Chiriqui, Panama. Altitude, 800 feet, 
Geogr, Distr, Panama, Central America. 
Genl, Char, Similar to P, centralis, but darker. Skull: muzzle 
broad, heavy; nasals short, broad; supraorbital ridges broad, 
Color, Above dark rufous; sides of face grayish brown; feet 
brown. 
Measurements, otal length, 450; tail, 150; hind foot, 55; ear, 
14. Skull: greatest breadth, 31; length of nasals, 23.5; width of 
nasals, 7.5; interorbital constriction, 15.8; greatest breadth on ridges, 
25; palatal length from henselion, 23; length of upper molar series, 
9.2; length of palatal foramina, 6.5; width of palatal foramina, 3.7. 
b.—panamensis (Proechimys!), Thomas, Ann. Mag. Nat. Hist., 
“th Ser., V, 1900, p, 220. 
PANAMA Spiny Rar. 
Type locality. ‘Savanna near City of Panama,’’ Panama. 
Geogr, Distr. Panama, Central America. 
Genl, Char, Similar to P. centralis; head and shoulders grayish 
brown, 
Color. Above rufous; head and limbs grayish brown; cheek and 
sides of neck paler; hind feet brown, remainder like P. centralts. 
Measurements, Total length, 475; tail, 178; hind foot, 54; ear, 
260, Skull: basilar length, 43; greatest breadth, 29; length of nasals, 
