164 



MUS. 



FIG. XXXV. Mus RATTUS. BLACK RAT. 



BLACK 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 vertebrae, 190. Skull: 

 occipito-nasal length, 37; 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. Reg. Anim., 1777, p. 381. 



Elliot, Syn. N. Am. Mamm., Suppl., 1901, p. 428. 



decumanus Pall., Glir., 1778, p. 91. Elliot, Syn. N. Am. Mamm., 



1901, p. 117. 

 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 vertebrae, 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. 



122. alexandrinus (Mus), I. Geoff., Descr. Egypt, n, 1818, p. 733, 



Atlas, pi. v, fig. i. Elliot, Syn. N. Am. Mamm., 1901, p. 118. 

 tectorum Savi, Nov. Giorn., 1825. 



