1908] Grinnell—Biota of the San Bernardino Mountains. 159 
Vespertilio fuscus Beauvois. Brown Bat. 
This large species was the most abundant and generally dis- 
tributed bat of the region. It came out early in the evening, 
often very soon after sundown, and was easy to shoot; so that 
specimens were secured at every point they were seen. The 
species was numerous in June, July and August along the upper 
Santa Ana, at the mouth of Foresee creek, 4700 feet altitude, 
at Seven Oaks, at our Cedar Cabin camp, 5500 feet, and at the 
mouths of South Fork and Fish creek. It was abundant at Bluff 
lake the latter half of July, and the last of August and the first 
of September. At the north base of Sugarloaf many were seen, 
and one obtained. Much to my surprise several were seen and 
shot at Cushenbury springs at the desert base of the mountains, 
August 11 and 12, 1905. 
The examples shot late in August were excessively fat, so 
much so that in some eases oil soaked through the fur, by way 
of the shot holes, within a few minutes after they were killed. 
It was impossible to make up decent specimens from animals in 
such a condition. 
The series of thirty skins secured shows much variation in 
depth of color. Some are very hght-colored, and these agree with 
Rhoads’ subspecies bernardinus. But others are as dark as the 
darkest I have seen from elsewhere in central and southern Cali- 
fornia, so that I cannot perceive the existence of a race bernar- 
dinus if it is to be based on color characters alone; unless it be 
that all California examples differ from the eastern animal. I 
have no eastern material for comparison. Using Ridgway’s 
‘*Nomenclature of Colors’’ as a basis for color names and shades, 
I find that dorsally my San Bernardino mountain examples vary 
from raw umber to vandyke brown, ventrally from pale wood 
brown to hght bistre. 
Pipistrellus hesperus (Allen). Western Bat. 
This species was only found at Cushenbury springs at the 
desert base of the mountains. There, August 10 to 13, 1905, it 
was abundant, appearing at late dusk among the cottonwoods and 
over the pasture. Swarms of these little bats darted about over 
