26 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 6l 



instead of 69 to J2 mm.) ; color of upperparts in fresh pelage a rich 

 dark brown (near the chestnut-brown of Ridgway) instead of black. 



Measurements. — Type: head and body, 405 mm.; tail, 500; hind 

 foot, 91 (85) ; condylobasal length of skull (teeth moderately worn), 

 71 .4 ; zygomatic breadth, 46.2 ; interorbital breadth, 28.3 ; nasal, 23.8 ; 

 diastema, 16.0; length of inflated portion of auditory bullae, 15.9; 

 mandible, 48.0; maxillary toothrow (alveoli), 14.6; mandibular 

 toothrow (alveoli), 15.0. 



Specimens examined. — Sixteen, from the following localities in 

 southern Tenasserim : Red Point, 2 ; Sungei Balik, 7 ; Telok Besar, 

 5 ; Victoria Point, 2. 



RATUFA CEL.ffiNOPEPLA, new species 



Type. — Adult male (skin and skull), No. 124149, United States 

 National Museum. Collected on Domel Island, Mergui Archipelago, 

 January 26, 1904, by Dr. W. L. Abbott. Original No. 3073. 



Diagnosis. — Like Ratufa phccopepla but color of upperparts in 

 fresh pelage clear blue black; skull with auditory bullae more in- 

 flated. 



Measurements. — Type: head and body, 415 mm.; tail, 487; hind 

 foot, 95 (88.5) ; condylobasal length of skull (teeth moderately 

 worn), 73.4; zygomatic breadth, 49.4; interorbital breadth, 31.2; 

 nasal, 24.3; diastema, 17.4; length of inflated portion of auditory 

 bulla, 16.6; mandible, 48.9; maxillary toothrow (alveoli), 14.5 ; man- 

 dibular toothrow (alveoli), 15.4. 



Specimens examined. — Three, all from Domel Island. 



Remarks. — The three forms here described increase the known 

 members of the restricted melanopepla-group to nine. Their char- 

 acters are indicated in the following key : 



KEY TO THE SQUIRRELS OF THE RATUFA MELANOPEPLA 



GROUP 



Large forms, greatest length of skull in individuals with distinctly 

 worn teeth usually more than 72 mm. 



Upperparts chestnut brown (never black) Tenasserim phccopepla 



Upperparts black when not faded. 



Greatest length of skull about 71 to 74 mm. (Terutau and 



Lankawi) frctcusis 



Greatest length of skull about 74 to 78 mm. (Domel) celccnopcpla 



Small forms, greatest length of skull in individuals with distinctly 

 worn teeth usually less than 72 mm. 

 Skull unusually narrowed (Natuna Islands) aiigusticep-s 



