MUEIDAE— SIGMODONTES— HESPEROMYS LEUCOPUS. 



71 



Table XIV. — Measurements of about fifty (and list of other) specimens purporting to be Hesperomys "gambeli" 

 from Washington and Oregon 1'erritories and California — Continued. 



* These specimens of Dr. Volluni's bear out the remarks made under Dr. Kennedy's. One of them is referable to " boylii "; 

 the rest are apparently " gambelii ". 



The foregoing table is to be compared with the following items in the 

 original diagnosis of " gambeli " : — " Very similar to H. leucopus in size and pro- 

 portions." This is true, even without the qualification. "Feet perhaps shorter." 

 This is not so; the feet are wholly within the range of variation of eastern leuco- 

 pus, and the average of the foregoing table is within an inappreciable fraction 

 (0.01 or 0.02) of the eastern average. "Ears larger." The largest ear in the 

 series is not over the length of a large percentage of the eastern series ; all the 

 ears are within the eastern limits of variation, and the average ear is within an 

 inappreciable fraction (0.02 or 0.03) of the eastern average. " Tail generally 

 less than the head and body, sometimes a very little longer." This expression is 

 precisely diagnostic of typical leucopus. " Above yellowish-brown, much mixed 

 with dusky, but without a distinct broad wash of darker on the back." Most of 

 the specimens really are paler and more uniform on the back than in average 



