462 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. xxvr. 



at surface of the gray (very nearly Ridgeway's No. 6) of the under fur. 

 The longer hairs show a distinct bluish luster. Under parts and innei 

 surface of legs gray (about Ridgeway's No. 6) faintly washed witbi 

 crrayish ])uff, the contrast between the color of this region and that ol| 

 sides very sHght. Head similar to back, but grizzle more fine. Feet! 

 dull, dark brown. Ears and tail uniform blackish. 



Shdl and teeth. --VaQ skull and teeth so closely resemble those oi 

 j\hisjirmm that I can find no tangible characters by which to disi 



tinguish them. 



Memurements.—^yitQV\vA\ measurements of type: Total length, 490. 

 head and body, 243; tail vertebrte, 247; hind foot, 47 (44). Averagtl 

 of 5 specimens from the type locality: Total length, 457 (400-497) 

 head and body, 227 (200-251); tail vertebrsB, 230 (200-252); hind foot, 

 4(5.4 (45-48); '^hind foot without claws, 43.6 (42-45). For details seej 



table, page 4«)2. 



Cranial measurements of type: Greatest length, 53 (53);^* basa 

 length, 46.4 (46); basilar length, 43.6 (43); length of nasals, 21 (21.4) 

 greatest combined breadth of nasals, 5.8 (5.6); diastema, 15 (15) 

 zygomatic l)readth, 26 (27); least interorbital breadth, 8 (8); depth o 

 brain case at front of basioccipital, 13 (13); frontopalatal depth at posi; 

 terior extremity of nasals, 12.4 (13); mandible, 31.4 (32.4); maxillar 

 tooth row (alveoli), 9 (9.4); mandibular tooth row (alveoli), 9.6 (lO). 



Specimens examined.— ^QY^n (one skull without skin), all from PuL 

 Mansalar. 



Rem,ar'k.s.—T\iQ distinctness of this species from the 3f%is Jirmus o 

 the near-by mainland is unquestionable. 



Measurements of Mus firmus and Mus domitor. 



! Measurements in parentheses are those of the type of Mm^ firmus. 



