1908] Grinnell—Biota of the San Bernardino Mountains. 145 
Peromyscus boylii rowleyi (Allen). 
Rowley White-footed Mouse. 
Mr. W. H. Osgood gives me the above determination for 
specimens from the San Bernardino mountains. We found these 
mice abundant in June and July, 1906, along the upper Santa 
Ana at the mouth of South Fork, 6200 to 6300 feet altitude. Our 
line of thirty small traps brought in as many as a dozen in one 
night, from settings under the willow clumps near the stream. 
Elsewhere this species was found but sparingly. A few were 
taken under golden oaks, near Seven Oaks, in July, 1905. On 
August 17 I trapped an adult male and two young (in the slaty 
pelage) near Cactus Flat, 6000 feet altitude. Although this is 
on the desert slope of the range, the ravine back of Johnston’s 
where these mice were taken is lined with golden oaks and other 
plants of the Pacifie slope flora. The mice were taken along a 
little stream among the oaks. 
A series of fifty-three examples of this species were obtained. 
Peromyscus truei truei (Shufeldt). True White-footed Mouse. 
This mouse was not found common anywhere, and was only 
detected at all in three places. On the south-facing slope on the 
upper Santa Ana, opposite the mouth of Fish creek, 6500 feet 
altitude, three adults of this species were trapped June 24, 1905. 
They were taken around a deserted wood rat’s nest, and some 
fallen and rotting logs. Other specimens were taken in the serub 
oak belt above Seven Oaks, 5100 to 5500 feet. A female con- 
taining six embryos was trapped at Saragossa springs, 7500 feet, 
near Gold mountain, August 26. Ten examples in all were pre- 
served. 
Peromyscus stephensi Mearns. Stephens White-footed Mouse. 
I know nothing of this species beyond the capture of two adult 
specimens August 13 and 14, 1905, near Cushenbury springs, 
4000 feet altitude, at the desert base of the mountains. These 
little mice look more like pale miniatures of Peromyscus truei 
than anything else I have seen comparable to them. Their size will 
be appreciated from the following statement of measurements: 
