146 University of California Publications in Zoology. (Vou. 5 
No. Sex Total length Tail vertebrae Hind foot 
1421 6 172 95 20 
1428 g 175 90 20 
Neotoma desertorum Merriam. Desert Wood Rat. 
We found this species abundant on the desert around Cush- 
enbury springs, 4000 feet altitude, at the north base of the moun- 
tains. Six specimens were trapped there August 11 to 14, 1905. 
Some were found among rocks, in which cases the house was 
merely a very scanty accumulation of stuff under or between the 
boulders. Others had fairly large rubbish houses about the bases 
of mesquite bushes. 
Neotoma intermedia gilva Rhoads. Banning Wood Rat. 
This wood rat appeared to be a rare species in the region. At 
least in all of our trapping we secured but two examples, taken 
July 8 and 11, 1905, a little ways above Seven Oaks, altitude 5100 
feet. They were trapped along the northwest wall of the Santa 
Ana at the margin of the scrub oak belt. 
Neotoma fuscipes mohavensis Elliot. Mojave Wood Rat. 
This was an abundant mammal throughout the Upper Sono- 
ran zone, both on the Pacific and desert slopes of the mountains. 
It ranged less commonly along willow-lned canons up through 
the Transition zone as well. It was in the serub oak and pinon 
belts that the stick houses were most numerous and conspicuous. 
Along the south-exposed north wall of the upper Santa Ana 
these nests were usually built up from the ground about the bases 
of bushes, and were in some cases three feet high and at the base 
twice as broad. They consisted of chunks such as result from 
the breaking up of dead and brittle pine branches, rather than 
of long sticks. Along the streams beneath the alders and willows 
the other style of house prevailed, made of long sticks and twigs 
put together into a steep stack. 
We trapped this animal at as high an elevation as 9000 feet, 
near Dry lake. This was on a south-exposed slope across which 
a well-characterized tongue of the Transition zone extended, 
though Boreal elements preponderated both above and below. 
