METACHIRUS. 



4. Metat'hirus. 



11 



50. 



Metachirus Burm., Thier. Bras., i, 1854, p. 135. Type Didelphys 

 nudicaudata E. Geoffrey. 



Size medium; pouch rudimentary or well developed; three cen- 

 tral hind toes subequal, longer than fifth: fur without bristles. Skull 

 with temporal crests well developed. 



FIQ. 3. METACHIRUS FUSCOGRISEUS. 

 No. 8252 Am. Mus. Nat. Hist. Coll. Nat. size. Type. 



KEY TO THE SPECIES. 



A. Under parts yellowish white. PAGE 



a. Upper parts grayish brown M. nudicaudatus 12 



b. Upper parts blackish, washed with gray. .M. juscogriseus 12 



c. Upper parts much paler, orbital ring larger. .M. f. pallidus 13 



