134 University of California Publications in Zoology. \Vou.5 
taken had its tail quills worn down to stiff stumps, probably 
from imeubatory funetions in close quarters. The species was 
seen at Knight’s ranch, a mile or so south of Baldwin lake, 
August 24, and at Bear lake, where on August 27 a small flock 
was seen and an adult male in full fall plumage secured. The 
mountain bluebird must be considered rare in the region as com- 
pared with the western bluebird; the former was detected only 
in the more arid Transition of the desert slope. Five examples 
in all of the mountain bluebird were taken. 
THE MAMMALS. 
The majority of the 812 specimens of mammals (skins with 
skulls) from the San Bernardino mountains were taken during 
the three months of continuous work in the summer of 1905. 
Mr. Joseph Dixon, my assistant that year, deserves especial credit 
for his industry in running long lines of traps, and for his pains- 
taking work in the preparation of skins. The present report does 
not do justice to this relatively large collection, which is now a 
part of the mammal collection of the University of California 
Museum of Vertebrate Zoology; the series will increase in sys- 
tematie value as material from others of our southern California 
mountain groups becomes available for comparison. No such 
material has been accessible to me in preparing this paper; so 
that the collection will bear thorough re-working at some future 
time. Especially to be desired is a geographie study of the genera 
Thomomys, Neotoma, Perognathus, and Peromyscus based upon 
extensive field work and large series of specimens. 
For the determination of a number of species I am indebted 
to members of the Bureau of Biological Survey, Washington, 
through its Chief, Dr. C. Hart Merriam. Their decisions have 
been nearly always adhered to. In fairness to them it should be 
known that but one or two examples of a species were submitted 
to them. I must myself bear the responsibility for this report 
throughout, and, as intimated above, further working of the eol- 
lection with adequate material for comparison may be expected 
to alter the nomenclature in some eases. 
Besides the thirty-five species formally listed below with anno- 
