2 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 24 



Acknowledgment 



This study would not have been possible without the generous assist- 

 ance of many persons, whose aid it is a pleasure to acknowledge. The 

 following extended many courtesies to the writer while she was visiting 

 their respective institutions, and gave permission to study and report on 

 the collections in their care: Fenner A. Chace, Jr., U. S. National 

 Museum ; Elisabeth Deichmann, Museum of Comparative Zoology, Har- 

 vard University; Dorothy E, Bliss, American Museum of Natural His- 

 tory; Frederick A. Aldrich and Ruth Patrick, Academy of Natural 

 Sciences of Philadelphia; Jack L. Littlepage, Natural History Museum, 

 San Diego; and Allyn Smith, California Academy of Sciences, San Fran- 

 cisco. Material was received on loan from Drs. Chace, Deichmann, and 

 Bliss, and from Jocelyn Crane, New York Zoological Society ; L. Pardi, 

 Istituto e Museo di Zoologia, Universita di Torino; Albert Panning, 

 Zoologisches Museum, Hamburg; Hans Brattstrom, Zoologisk Museum, 

 Bergen; and Nils Knaben, Universitetets Zoologisk Museum, Oslo. 

 Material in their institutions was examined for the writer and informa- 

 tion on it provided by Dr. Panning and by Jacques Forest, Museum 

 National d'Histoire Naturelle, Paris, and Isabella Gordon, British 

 Museum (Natural History). Information on specimens and locality 

 records was tendered by Dr. Aldrich and by Mrs. G. C. Carl, Victoria, 

 British Columbia; L. R. Richardson, Victoria University College, Wel- 

 lington, New Zealand ; and M. Woodbridge Williams, Bethesda, Mary- 

 land. Valuable suggestions on nomenclatural problems were offered by 

 Dr. Chace and by W. I. Follett, California Academy of Sciences. Per- 

 mission to retain material for the Hancock Foundation collections was 

 given by Miss Crane and Drs. Bliss and Panning. Professor Richardson 

 and J. C. Yaldwyn, Victoria University College, Wellington, kindly sent 

 comparative material of New Zealand species, and R. Zariquiey Alvarez, 

 Barcelona, made a loan of European forms. The photographs were taken 

 by Francis Munger, Whittier, California. The writer wishes to thank 

 the administration of the Allan Hancock Foundation for permission to use 

 its facilities and study its collections. Finally, she acknowledges her in- 

 debtedness to members of the Hancock Foundation staff who followed 

 and assisted the progress of this work from the beginning: Dorothy M. 

 Halmos and Mary Ellen Pippin, librarians, who helped locate many an 

 obscure reference, and John S. Garth, who read the manuscript and 

 offered encouragement and advice throughout. 



