1915 13 
ACKNOWLEDGMENTS 
Any undertaking of the nature of the present contribution is necessarily a 
co-6perative affair. One person working by himself would inevitably fail in 
considerable measure. The writer is therefore fortunate in being able to acknowl- 
edge direct assistance from very many sources. This gives him confidence that 
the results of his work are more nearly what the present stage of our science 
demands. 
The writer is indebted first of all to Miss Annie M. Alexander, the Founder 
of the Museum of Vertebrate Zoology of the University of California. This 
indebtedness has been incurred on two scores: First and primarily, in that since 
the inauguration of the Museum’s activities, in March, 1908, there has been 
as a result of her generous support of field work a unique accumulation of 
facts and specimens from which to study bird distribution in this state. It is 
particularly gratifying to record that this mass of data is on file in a public in- 
stitution, the property of the state of California, where it is freely accessible 
to any student of the subject. It is safe to say that seventy-five percent of both 
the specific facts and general statements recorded in the present paper are capa- 
ble of verification from the original records and specimens in this institution 
alone. Secondly, the author is under personal obligation to the same benefactor, 
who has been in continuous control of the Museum since its inauguration, for 
allotment of a good share of his time to this, his favorite subject. Without this 
privilege, and particularly without the active sympathy of Miss Alexander in 
the all-important field work, no such relatively thorough knowledge would be 
available at this time. 
It is in order, also, to here express deep appreciation of the repeated and 
important helps given by Messrs. Joseph Mailliard and John W. Mailliard. To 
be explicit, these gentlemen not only placed at the writer’s disposal their finely 
eared for and extensive private collections, but read and re-read the first drafts 
of this paper, with the result that many errors were detected and much important 
information added. 
To Professor Harvey M. Hall I am grateful for considerable aid in mapping 
the life zones of California. Since the zoologist is compelled to make constant 
use of plants in indicating the ranges of animals, he continually appeals to the 
botanist. Professor Hall has very similar views to the present author’s, as re- 
gards the entity of life zones, and he has generously contributed from his own 
knowledge of the conditions in many parts of California. The zone maps accom- 
panying the present paper owe their approximate accuracy in many places to 
his critical attention. 
Members of the staff of the Museum of Vertebrate Zoology have not only 
helped conscientiously in whatever function the daily routine demanded, but Mr. 
Harry 8. Swarth, in particular, has proffered numerous corrections and items 
