FE... PROCEEDINGS OF THE NATIONAL MUSEUM. 461 
‘ 
ys 
os 
Description. 
Size intermediate between Mus musculus and Mus decumanus. Bars 
moderate, broad; toes 5-5. Fore feet with long, slender, little-curved 
claws. The thumb is armed with a short, stout claw—not with a nail, 
as is usual in this genus. Palms with five large tubercles. 
Hind feet moderate, with rather large, stout claws. Soles naked. 
Second, third, and fourth toes subequal and longest; first and fifth 
much shorter. 
Tail shorter than the body,* not sufficiently well clothed with hairs 
to conceal the scales. 
Naked portion of the muzzle confined to a small area between the 
nostrils; the two halves of the same divided by a line of hairs. 
Fur of the throat and chin directed forward; in all other parts, back- 
ward. 
The fur is moderately harsh. When examined with a lens it is seen 
to be composed almost exclusively of | 
coarse, flat hairs, with a few fine ones 
‘ intermingled. 
General color above dusky brown 
and below cinnamon. Feet and tail 
dusky. All the hairs are pale sepia 
brown at the base. 
Those of the upper surfaces are 
dusky at the tip, with a single sub- 
terminal ring of cinnamon, except on 
the rump and muzzle, where the sub- 
terminal ring is wanting. 
Fie. 1.—Mus aquilus True. Skull, enlarged; leet, ears, and tail dusky brown. 
a ee Type, Hairs of the under surfaces through- 
out tipped with clear, pale cinnamon. There is a tinge of this color 
on the inner side of the hind feet proximally. 
Skull slender (Fig. 1); muzzle depressed, elongate; zygomatic arch 
Straight, not curved downward in the center. Infraorbital foramen 
large; the anterior margin of the root of the malar inclined outward. 
Incisive foramina long, expanded in the center. Palate ending in a 
projection, or tubercle, below the general level. Coronoid process of 
mandible moderate. Angle short and directed obliquely downward. 
Dimensions of the dry skin. t 
Inm. 
Preiroivicadnamriubody 22.2.5 Sve... osatias aoe SS See a ae ee 102.0 
EMRE LRU AE rors Peveinfs 8 523 ow Ac Yate cd ee es eee =e aes Be ee Coe eee 55. 0 
eee Le 1000 ANG Cla w.~-... 2... -/- acjonteeng ones ea nee = See sees ee 23.0 
See eicur trom tne OCCiput....-. -.-5.- 62 ones se a sew ese eee 13.0 
Renee Most sent TOTO CLAW <2 28. att lw pines eee pee ee ee eens ee eee ee 4.6 
Seer orionugest hairs of the back ....-...-.)l3 ..422. 2 5e20. 2-322 Ske eke 13:5 
*From the uneven appearance of the extremity of the tail it is possible that a 
sinall portion is missing. 
t These dimensions must, of course, be considered only approximately correct. 
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