mus 869 



true outer tubercle on first lamina ; second and third laminae and 

 terminal heel normal and with no trace of supplemental tubercles 

 on outer side of crown. Second lower molar essentially like 

 second and third laminae of first, but with tubercles of posterior 

 lamina distinctly smaller than those of anterior lamina, and 

 terminal heel greatly reduced. Third lower molar with crown 

 area equal to about one-third that of second, its anterior lamina 

 with two tubercles smaller than those of posterior lamina of 

 second tooth, its terminal heel relatively better developed than 

 that of m 2 . 



Bemarhg. — Although occasionally straying to considerable 

 distances from houses, Mus musculus is characteristically an 

 urban species, and its spread from central Asia to Europe and 

 thence throughout the world has been chiefly due to human 

 agency. Two moderately well-marked local races occur on the 

 continent of Europe, while two more strongly differentiated 

 forms are confined respectively to St. Kilda Island and the 

 Faeroes. 



Mus musculus musculus Linnseus. 



1758. [Mus] musculus Linnaeus, Syst. Nat., I, 10th ed., p. 62 (Sweden). 

 1801. M[us] m[usculus] albus Bechstein, Gemeinn. Naturgesch. Deutsch- 



lands, I, 2d ed., p. 955 (Thiiringen, Germany). 

 1801. M[us] m[usculus] flavus Bechstein, Gemeinn. Naturgesch. Deutsch 



lands, I, 2d ed., p. 955 (Thiiringen, Germany). 

 1801. M[us] m[usculus] maculatus Bechstein, Gemeinn. Naturgesch 



Deutschlands, I, 2d ed., p. 955 (Thiiringen, Germany). 

 1801. M[us] m[usculus] niger Bechstein, Gemeinn. Naturgesch. Deutsch 



lands, I, 2d ed., p. 955 (Thiiringen, Germany). 

 1827. [Mus musculus] striatus Billberg, Synopsis Faunae Scandinaviae 



p. 6 (Skane, Sweden). 

 1827. [Mus musculus] y albicans Billberg, Synopsis Faunas Scandinaviae 



p. 6 (Skane, Sweden). 

 1827. [Mus musculus] S niveus Billberg, Synopsis Faunae Scandinaviae 



p. 6 (Molle, Norway). 

 1837. ? Mus brevirostris Waterhouse, Proc. Zool. Soc, London, p. 19 (Mal- 



donado, Uruguay). 

 1844. IDrymomys parvulus Tschudi, Fauna Peruana, p. 178 (Central Peru). 

 1857. Mus musculus Blasius, Saugethiere Deutschlands, p. 320. 

 1867. [Mus musculus] helvolus Fitzinger, Sitzungsber. kais. Akad. Wis- 



sensch. Wien, Math.-Naturwiss. Classe, lvi, pt. i, p. 70 



(Hungary). 

 1867. [Mus musculus] varius Fitzinger, Sitzungsber. kais. Akad. Wissensch. 



Wien, Math.-Naturwiss. Classe, lvi, pt. i, p. 70 (Europe). 

 1867. [Mus musculus] cinereo-maculatus Fitzinger, Sitzungsber. kais. Akad. 



Wissensch. Wien, Math.-Naturwiss. Classe, lvi, pt. I, p. 70 



(Europe). 

 1869. Mus poschiavinus Fatio, Faune Vert. Suisse, i, p. 207 (Poschiavo, 



Grisons, Switzerland). 



