18 Lyon — A New Flying Squirrel from the Island of Terutau. 



Skull and teeth. — These show no essential differences from those of Pet- 

 aurista nitidula. 



^/ramreynm/s.— External measurements of the type: head and body, 

 385 mm.; tail vertebrae, 450 ; hind foot, with claws, 75; weight, 2} lbs. 

 (1134 grams). Cranial measurements of the type: total length, 64.3 mm.; 

 basal length, 57; basilar length, 53.5;. palatal length, 34.2; zygomatic 

 breadth, 43.2; interorbital constriction, 12.4; constriction behind post 

 orbital processes, 16.6; maxillary toothrow (alveoli), 14.2; mandibular 

 toothrow (alveoli), 15. 



Specimens examined. — One, the type. 



