1908] Grinnell_—Biota of the San Bernardino Mountains. — 153 
Dipodomys merriami simiolus (Rhoads). Allied Kangaroo Rat. 
This species of kangaroo rat was found to be common on the 
desert around Cushenbury springs, at the north base of the maun- 
tains, and also well up over the desert slopes. We found it on 
Cactus Flat, 6000 feet altitude, where immatures were taken 
August 15 and 16, 1905. Signs of the species were noted at 
Doble, 7000 feet altitude, and an adult female (No. 1396) was 
taken August 9 on a stretch of sand (‘“‘tailings’’ from the quartz 
mill at Gold mountain). This latter record is one of remarkable 
altitude for this species, which I had always considered strictly 
Lower Sonoran. Yet the actual distance up the canon from 
Cushenbury springs to Doble, air-line, is not more than six miles. 
Many desert plants, such as a species of tree yucca, run up on 
hot slopes to an altitude of 6500 feet. 
Perognathus panamintinus bangsi (Mearns). 
Bangs Pocket Mouse. 
Two immature examples of a small pocket mouse are with 
scarcely any doubt referred to this form. One (No. 1412) was 
taken on the desert at Cushenbury springs August 12, 1905; and 
the other (No. 1442) at Cactus Flat, also on the desert side of 
the mountains, August 16. 
An immature Perognathus was found partially eaten in a trap 
in the sage tract at the north base of Sugarloaf, 7500 feet al- 
titude, August 22, but I have no idea what species it belonged to. 
Perognathus formosus Merriam. Long-tailed Pocket Mouse. 
A rather large, smooth-coated pocket mouse obtained on the 
desert at Cushenbury springs, is identified by Mr. W. H. Osgood 
as of this species. Five specimens were trapped on sandy ground 
between small bushes. I also took an immature example 2000 
feet higher on the desert slope of the mountains at Cactus Flat, 
6000 feet altitude. This specimen (No. 1446, Coll. J. G., August 
17, 1905) seems to me referable to formosus, though its immatur- 
ity forbids accurate determination. 
