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THE MAMMALS OE EGYPT. 
Subfamily MURINJE. 
Infraorbital foramina pear-shaped, with short lateral wings. Molars cuspidate, with 
laminate bars when worn ; cusps arranged in three rows in the upper, two in the 
lower series of teeth. Number of teeth as in Gerhillinoe. 
Mus, Linn. Syst. Nat. x. 1758, p. 59. 
MUS. 
Tail long, scaly. Pollex rudimentary, with a small flattened nail. 
Mus EATTUS, Linn. 
Mus rattus, Linn. Syst. Nat. x. 1758, p. 61. 
Mus alexandrinus, Desmar. Nouv. Diet. Hist. Nat. xxix. 1819, p. 47; id. Ency. Meth., Mamm. 
1822, p. 300; Geoffr. et And. Descr. Egypte, ii. 1829, p. 733; “Rat d’Alexandrie” Atlas, 
pi. V. fig. 1 ; ed. 8vo, Hist. Nat. v. p. 183. 
Mus tectorum, Savi, Nov. Giorn. Pisa, Feb. 1825; Bonap. Fauna Ital. i. 1832-41, pi. 21. 
Mus flavigaster, Heugl. Verbandl. K. Leop.-Carol. Ak. Naturf. 1861, p. 4, tab. ii. fig. 2. 
? . Fayum. 
? , Assuan, 
$. Minia. Major K. H. Brown, C.M.G. 
$ . Haji Kendil. Prof. Flinders Petrie. 
3 juv. Gizeh. Capt. S. S. Flower. 
3 $. Old Cairo. Dr. C. W. Andrews. 
J', $ , 6 juv. Qasr el Gebali, Fayum. Dr. C. W. Andrews. 
Muzzle pointed; ears large; tail very long and tapering, scales coarse, set in 
distinct rings, 9 of which occupy about 10 mm.; feet well formed, the fifth toe Ion 
and somewhat thumb-like. Numerous long, straight, glossy black hairs projectin 
beyond the fur of the back, 60 mm. or more in length in some specimens. 
There are two distinct varieties of the Black Bat found in Egypt—nne being the 
town rat, a large grizzled brown form with grey belly, the Mus alexandrinus, Desm,; 
the other a smaller, yellowish-brown, white or lemon-white bellied form, Mus tectorum, 
Savi, which frequents groves and palm-trees. 
This rat has become quite cosmopolitan, and very many of the names with which the 
genus Mus has been loaded are attributable to forms of this species. 
ba bfj 
