PROECHINOMYS. 387 



NlCARAGUAN SPINY RAT. 



Type locality. San Emilio, north end of Lake Nicaragua, Nicaragua. 



Geogr. Distr. Costa Rica, Nicaragua. 



Genl. Char. Similar to P. scmispinosus, but brighter colored; 

 nasals pointed posteriorly; zygomata broad; pterygoid processes 

 broad, spatulate. 



Color. Similar to P. semis pinos us, "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. c.) 



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 locality. Bogava, Chiriqui, Panama. Altitude, 800 feet. 



Geogr. Distr. Panama, Central America. 



Genl. Char. Similar to P. ccntralis, but darker. Skull: muzzle 

 broad, heavy; nasals short, broad; supraorbital ridges broad. 



Color. Above dark rufous; sides of face grayish brown; feet 

 brown. 



Measurements. Total 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., 



7th Ser., v, 1900, p. 220. 

 PANAMA SPINY RAT. 



Type locality. "Savanna near City of Panama," Panama. 



Geogr. Distr. Panama, Central America. 



Genl. Char. Similar to P. centralism 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. centralis. 



Measurements. Total length, 475; tail, 178; hind foot, 54; ear, 

 26. Skull: basilar length, 43; greatest breadth, 29; length of nasals, 



