150 
Psyche 
[September 
ACKNOWLEDGEMENTS 
While preparing this work I used the collections and library of 
the British Museum (Natural History) and the laboratory and library 
of the University of Connecticut, Department of Zoology and En- 
tomology. To these institutions the author expresses his sincere ap- 
preciation. My thanks are due to Dr. J. A. Slater for his kind help 
and the loan of literature. I also appreciate help received from Dr. 
W. E. China, especially for valuable opinions on the subject and for 
reading the typescript. 
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