SCIURUS. 



103 



Measurements. Total length, 384; tail vertebrae, 189; hind foot, 

 54. Skull: average of four; basal length, 41.7; palatal length, 21.4; 

 interorbital width, 15.3; zygomatic width, 28.4; length of upper 

 molar series, 9.1. 



0. Guerlinguetus. 



Size small; ears long; tail shorter than body, flat, bushy. Skull 

 broad, braincase not highly arched, expanded at parietal region; 

 bullae small; rostrum broad, deep; nasals long, widest anteriorly; 

 post-palatal notch behind last molar. Premolars, ^. 



FlG. 15. SCIURUS iGUERLINGUETUSi /. HOFFMANNI. 

 No. 4749 Field Columbian Mus. Coll. Nat. size. 



KEY TO THE SPECIES AND SUBSPECIES OF THE SUBGENUS. 



A. Size small; tail flat, bushy. PAGE 



a. Upper parts grizzled rusty brown S. ce. hoffmanni 104 



b. Upper parts blackish brown and tawny .. 5. CB. chiriquensis 104 



c. Upper parts dark ochraceous brown S. richmondi 105 



