238 



CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



Measurements of Mus alexandrinus. 



Mus musculus LinncBus. 



Mus musculus Linn. Syst. Nat. 1766, p. 83. 



Range. — Cosmopolitan. Indigenous in Asia. Galapa- 

 gos Archipelago: Chatham Island (Hopkins Expedition). 



Five specimens were secured at Wreck Bay, Chatham 

 Island, about the warehouses, where they have doubtless 

 been recently introduced from Ecuadorian vessels, as they 

 have not yet spread to the uninhabited portions of the 

 island. 



Our specimens are somewhat different in coloration from 

 typical M. Tnusculus. The brownish of the upper parts is 

 largely mixed with reddish, the under parts are light ashy 

 gray washed with brownish fulvous, and the feet are white 

 above. 



