A. Epimys. Trouess. 1881. 



Upper tooth row. 

 Enlarged 4 times. 



Fig. 28. Mus RATTus. 

 No. 4670 Field Columbian Museum Coll. Nat. size. 



Lower tooth row. 

 Enlarged 4 times. 



Genl. Char, Tail little shorter than head and body: sparsely 

 haired; annuli about two hundred. 



Color. Above rusty grayish brown; sides grayer; beneath ashy 

 white. Tail above dusky, beneath paler. 



Measurements. Total length, 310; tail vertebra", 146; hind foot, 38. 



150. alexandrinus. (Mus), Is. Geoff. Descr. Egypt, ii, p. 733,1812, 



Atlas, pi. V, fig. I. 



tectorum, Savi. Nov. Giorn. di Lett., 1825. 



Geogr. Distr. Cosmopolitan. 



Genl. Char. Smaller than M. decitmanus; tail considerably longer 

 than head and body; annuli about 240. 



Color. Above yellowish brown tinged with reddish; flanks grayish. 

 Under parts and upper surface of feet, yellowish white. Tail dusky. 



Measiirenieiits. Total length, 356; tail vertebra-, 198; hind foot, 35. 



151. musculus. [Mus), Linn. Syst. Nat., 1766, p. 83. 

 Type locality. Sweden. 



Geogr. Distr. Cosmopolitan. 



Genl. Char. Tail longer than body; soles naked. Size small. 



Color. Above grayish brown lined with blackish; beneath ashy 

 plumbeous tinged with reddish. Tail dusky; feet ashy brown. 



Measurements. Total length, 170; tail vertebra, 83; hind foot, 18; 

 ear, 13.5. 



