164 MUS. 
Fig. XXXV. Mus RATTUS. BLACK RAT. 
BuLack Rat. 
Type locality. Sweden. 
Geogr. Distr. Cosmopolitan. 
Genl,. Char. Tail little longer than head and body. 
Color. Above sooty black; beneath plumbeous; feet brown. 
Measurements. Total length, 368; tail vertebre, rt90. Skull: 
occipito-nasal length, té Hensel, 30; zygomatic width, 17.5; inter- 
orbital constriction, 5.5; length of nasals, 12; palatal length, 16.5; 
length of upper tooth row, 6. 
121. norvegicus (Mus), Erxl., Syst. Rég. Anim., 1777, p. 381. 
Elliot, Syn. N. Am. Mamm., Suppl., rgor, p. 428. 
decumanus Pall., Glir., 1778, p. gt. Elliot, Syn. N. Am. Mamm., 
OGL, py Lares 
Norway Rat. 
Type locality. Norway. 
Geogr. Distr. Cosmopolitan. Introduced into North America. 
Genl. Char. Tail little shorter than head and body, sparsely 
haired; annuli about 200. 
Color. Above rusty grayish brown; sides grayer; beneath ashy 
white; tail above dusky, beneath paler. 
Measurements. Total length, 310; tail vertebre, 146; hind foot, 
38. Skull: occipito-nasal length, 44; Hensel, 21; zygomatic width, 
22; interorbital constriction, 6; length of nasals, 14; palatal length, 
20.5; length of upper tooth row, 6. 
— 
i] 
2. alexandrinus (Mus), I. Geoff., Descr. Egypt, 11, 1818, p. 73 
Atlas, pl. v, fig. x. Elliot, Syn. N. Am. Mamm., rgor, p. 11 
tectorum Savi, Nov. Giorn., 182: 
CO WwW 
