miller] seventy new MALAYAN MAMMALS 37 



nor is there any tendency toward the formation of a dark dorsal line. 

 Laterally the dark tips become less and less abundant, their color at 

 the same time fading through bluish gray nearly to white, so that 

 near line of demarkation between color of sides and that of under- 

 parts the buff is essentially pure. Underparts and inner surface of 

 legs white, distinctly tinged with cream-buff. A well defined whitish 

 patch covers area on each side of muzzle from which whiskers 

 spring. Eye surrounded by a well-defined dark ring. 



Measurements. — Measurements of type: total length, 360; head 

 and body, 190; tail, 170; hind foot, 37 (35) ; skull, greatest length, 

 45 ; zygomatic breadth, 19. 



Specimens examined. — Twenty-three (four skulls without skins), 

 all from St. Matthew Island. 



Remarks. — The series of nineteen skins presents no variation in 

 color worthy of special comment. One specimen has the tail longer 

 than the head and body, but in all the rest the proportions are essen- 

 tially as in the type. 



MUS UMBRIDORSUM sp. nov. 



Type. — Adult male (skin and skull). No. 104,227, United States 

 National Museum. Collected on Loughborough Island, Mergui 

 Archipelago, January 24, 1900, by Dr. W. L. Abbott. Original 

 number, 269. 



Characters. — Similar to Mns lutcolus, but ground color above 

 slightly more yellow, and black of back tending to concentrate into 

 a noticeable dorsal streak. 



Color. — The ground color of back and sides is intermediate be- 

 tween the buff and bufif-yellow of Ridgway, though nearer the latter. 

 Black-tipped spines slightly more abundant than in Mus luteolus, 

 those of middle of back forming a distinct though not sharply out- 

 lined dorsal streak about 10 mm. wide, extending from nape to base 

 of tail. Otherwise as in Mus luteolus. 



Measurements. — Measurements of type : total length, 350 ; head 

 and body, 180; tail vertebrse, 170; hind foot, 40 (38) ; skull, greatest 

 length, 42 ; zygomatic breadth, 18. 



Specimens examined. — Thirteen (five skulls without skins), all 

 from Loughborough Island. 



Remarks. — Specimens vary somewhat in the yellowness of the up- 

 perparts and in the distinctness of the dark dorsal area, but the 

 series considered as a whole is easily distinguishable from those pro- 

 cured on other islands or on the mainland. In every individual the 

 length of head and body exceeds that of tail. 



