1908] - Grinnell—Biota of the San Bernardino Mountains. — 147 
A house was noted there, and one of the occupants trapped, June 
22, 1905. 
No other evidences of the presence of wood rats were seen 
elsewhere higher than 7500 feet. Houses were seen up to this 
elevation in both Fish creek and South Fork canons. This species 
was trapped just below the narrows on the lower Santa Ana, 2500 
feet altitude, June 12, 1905; and it was taken in numbers in the 
vicinity of the mouth of Foresee creek and Seven Oaks in June 
and July; also in August at the north base of Sugarloaf, at 7500 
feet, where nests were common in willow clumps and service- 
berry bushes; and at Doble, Saragossa springs and Cactus Flat. 
In the latter localities quantities of pinon shells were seen in 
the nests. Small young were taken on the upper Santa Ana 
opposite the mouth of Fish creek, 6500 feet, as early as June 20 
(1905). 
Mr. E. A. Goldman, of the Bureau of Biological Survey, has 
determined this form as mohavensis. I have a number of ex- 
amples from Victorville, on the Mojave river, very close to the 
type loeality of mohavensis, with which the San Bernardino 
mountain form looks to me to be identical. Elhot’s deseription 
of mohavensis makes comparison only with V. f. macrotis. But 
it seems to me much nearer the NV. f. simplex (True), described 
from Fort Tejon, Kern county. Elhot (Check List N. Am. 
Mammals, 1905, p. 206) considers simplex a synonym of macrotis ; 
but judging from my specimens there are two widely distinet 
forms to which these names are separately applicable. 
Out of my series of eighty-two examples from the San Ber- 
nardino mountains, forty-one selected specimens (fully adult, 
with unmutilated tails) measure as follows: 
Total length Tail vertebree Hind foot 
( Average 359 168 35.6 
21 66 < Greatest 394 187 38 
Least 330 ; 150 33 
( Average 357 171 35.4 
20 99 Greatest 380 195 38 
( Least 340 160 34 
In spite of my having thrown out all skins with obviously 
broken tails, it will be noted that the females show greater caudal 
