762 PROCEEDINGS OF TI{E NATIONAL MUSEUM. v(.i..xxiv. 
Dr. Abbott Avrites as follows of the rats of Henry Lawrence Island 
{Mus stoic I (St and 3lus Jiehilis)'. 
Trapped in the dense jungle with which tlie island is covered. Note that in this 
lot there are two distinct species; one large with tail shorter than head and body 
[3/. stoicus], and one smaller with tail longer than head and body [M. flebilis']. 
The tail is more hairy in the smaller species. Botli were caught in the same places, 
on the west side of the island on Kwantung Straits, at two localities about two miles 
apart. The smaller one squeals piteously when caught in a trap, but the larger is 
silent. 
MUS TACITURNUS, new species. 
Type.— Adu\t male (skin and skull), No. 111828, U.S.N.M. Col- 
lected on South Andaman Island, Andamans, January 16, 1901, by Dr. 
W. L. Abbott. Original number, 854. 
Characters. — Slio'htly larger than Mus stoicKs., and color lioth above 
and below more ting-ed with yellow. 
Color. — Back and sides a coarse grizzle of black and ])right ochra- 
ceous l)uft' (distinctly more yellow than Ridgway's, PI. v, iig. 10), the 
latter very conspicuously in excess. Underparts paler than in 3£us 
stoicus^ though the elements of the color are essentially the same, the 
difference due to the more extensive whitish hair tips, and faintly 
lighter under fur. Color otherwise as in Miis stoicus. 
Measurements. — External measurements of type: Total length, 494 
mm. ; head and bod}^, 266; tail, 228; hind foot, 53 (50); ear from meatus, 
24; ear from crown, 21; width of ear, 16.4. An adult female measures: 
Total length, 446; head and body, 237; tail, 209; hind foot, 48 (46). 
For detailed measurements see table, page 764. 
Specimens examined. — Seven, all from the type locality. 
Remarks. — This species is ver}^ closely allied to Mus stoicus., but is 
nevertheless easil}^ distinguishable on comparison. It is probably the 
rat recorded by Blanford as "a variety of Mushowersi or a closely 
allied form." * Mus hoiversi differs, however, from all of the ^-ats known 
to occur on the Andamans by its distinctly bicolored tail. 
MUS FLEBILIS, new species. 
Ty2)e.—AA\\\t female (skin and skull), No. 111841, U.S.N.M. Col- 
lected on Henry Lawrence Island, Andamans, Januar}' 10, 1901, by 
Dr. W. L. Abbott. Original number, 827. 
Characte)'s. — A large member of the Mus ratttis group. Size about 
as in 3fus pannos}(sof the Butang Islands, but tail always considerably 
longer than head and l)ody. Fur thickly sprinkled with weak spines, 
its color paler and more j'ellow than in Mus pa7inosus and closely 
resembling that of 3fus stoicus. Skull much like that of Ifus jxfnnosus, 
but with larger audital bulla?, more prominent supraorl)ital ridges, 
and smaller teeth. 
'The Fauna of Bntish India, Mannn., 1891, p. 410. 
