2l6 MILLER 



least depth of mandible between incisor and premolar 10.2 ; maxillary 

 toothrow (alveoli) 14; breadth across both upper incisors at rim of al- 

 veoli 9.8; mandibular toothrow (alveoli) 14. S. 



Specime7is examined. — Six, all from the type locality. 



Remarks. — This is an insular race characterized, contrary to the 

 general rule, by increase in size. Its peculiarities are well marked 

 and constant. 



RATUFA TIOMANENSIS sp. nov. 



Type. — Adult male skin and (skull). No. 101751 United States 

 National Museum. From Tioman Island. Collected October 4, 

 1S99. 



Characters. — Color exactly similar to that of Ratufa anambce and 

 R. uielanopepla., but size smaller and tail relatively longer than in 

 either. Skull like that of 7?. ^nclanopepla., but with more inflated 

 audital bullae. 



Color. — See description of Ratufa anajnbce.^ which applies equally 

 well to this animal. 



Skull. — In size and general form the skull of Ratufa tiomanensis 

 so closely agrees with that of R. melanopepla that no special descrip- 

 tion is necessary. The audital bullae are, however, slightly though 

 constantly different in form. Though of about the same size as in R. 

 i7ielanopepla the bullae are more inflated, so that when viewed from 

 behind (the skull held upside down) they appear to rise higher and 

 more abruptly above surface of basioccipital. This character, though 

 slight, is readily appreciable when specimens are compared, and its 

 constancy makes it of more importance than would at first sight be 

 supposed. 



Measurements. — External measurements of t3'pe : total length 724; 

 head and body 368; tail vertebra 356; pencil 90; hind foot 78 (73). 

 Average of five specimens from the type locality: total length 740 

 (724-762) ; head and body 343 (305-368) ; tail vertebne 397 (356- 

 419) ; hind foot 76.4 (74-78) ; hind foot without claws 69.8 (68-72). 



Cranial measurements of type: greatest length 68.4 (70);' basal 

 length 56.4 (59) ; basilar length 52 (53) ; palatal length 26 (26.4) ; 

 diastema 15.4 (16) ; length of nasals 23 (23.4) ; breadth of nasals an- 

 teriorl}' 12.6 (13); breadth of nasals posteriorly 7 (7) ; interorbital 

 breadth 26 (28) ; breadth between tips of postorbital processes 39 

 (41); zygomatic breadth 43.4 (44); mastoid breadth 31 (32.6); 

 breadth of palate ])etwcen premolars 10 (10); depth of rostrum at 



' Measurements in pircnthesis are those of the type of Ratufa tiielanopepla. 



