PACIFIC COAST AVIFAUNA No. 13 
.. Synonyms. In parenthesis following the scientific name of each spe 
cies is the vernacular name, and following this are all other names by which 
that species has been called anywhere in the ten volumes of The Condor here 
covered. Each of these names is also listed separately in its correct alphabet- 
ical place in the Index, and cross references show under what scientific name 
all the information is collected. In this way all references are brought together 
under one name. The latest American Ornithologists’ Union Check-List has 
been followed for scientific names excepting for geographic races recognized 
subsequent to its publication, and for these the current usage in The Condor 
has been followed—anticipating in some cases the acceptance of these races by 
the American Ornithologists’ Union Committee on Nomenclature. 
6. Key letters. Where any species is referred to in The Condor by any 
other name than the scientific name used herein the reference in the Index is 
followed by a key letter, and by examining the names in the parenthesis which 
follows the scientific name it may be found what that name is. Thus, in the 
index, the Cedar Waxwing appears as follows: 
Bombycilla cedrorum (*Cedar Waxwing, "Ampelis, ‘Cedar Bird) 
The first reference is Ark., XVII, 5i—meaning that there the name used is 
Bombycilla cedrorum; the first reference for California is XII, 48*—and indi- 
cates that here Bombycilla cedrorum has been omitted, the name Cedar Wax- 
wing appearing alone. The first reference for Morelos is XI, 65?—indicating 
that the bird is mentioned under the name Ampelis cedrorum. The reference 
for ‘food’ is XIII, 107°—and means that here the species is called Cedar-bird 
only. For the expert these key letters are perhaps unnecessary; but for the 
average worker they are needed for the reason that all the synonyms for each 
and every species cannot be kept in mind. Hence a novice in looking up ref- 
erences to the species above mentioned would perhaps overlook ‘Ampelis’ in 
his search for either ‘Bombycilla’ or ‘Cedar Waxwing’ were not the key letters 
used. 
ACKNOWLEDGMENTS 
Sincere thanks are herewith extended to Joseph Grinnell and Harry S. 
Swarth for encouragement, help and advice during the time the Index has been 
in course of preparation, and also for their service in editing the manuscript 
for the press and for proof-reading. Acknowledgements are here made to the 
author’s wife, Mrs. Edith Pemberton, for assistance in the second reading of 
the proof. To all those Club members who replied to the circular letter above 
mentioned, thanks are also extended, not only for their suggestions, which de- 
termined the style of the Index, but also for the interest which they displayed 
and which served as the stimulus to encourage the writer in what would other- 
wise have seemed hopeless drudgery. 
J. R. PEMBERTON, 
San Francisco, California, January 17, ror 
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