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VOLUME ELEVEN NUMBER FOUR 
JOURNAL 
ENTOMOLOGY 
ZOOLOGY 
DECEMBER, 1919 
PUBLISHED QUARTERLY BY . 
POMONA COLLEGE DEPARTMENT of ZOOLOGY 
CLAREMONT, CALIFORNIA, U.S. A. 
CONTENTS 
NoTes ON THE BEHAVIOR OF THE SOCIAL Wasp Potistes—Horace Gunthorp........ 63 
BIOLOGY oF THE NorTH AMERICAN CRANE-FLigs, V. THE GENUS DICRANOPTYCHA 
(Op LDPC ae MEET Ty APEC he FOR RRO Eo oie: JOP OPERATE G5 67 
Tue CenTraL Nervous SysteM oF NucuLa AND Matietia—W. 4. Hilton....... 15 
EEE eeEeEeEeEe 
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Entered Claremont, Cal., Post-Office Oct. 1, 1910, as second-class matter, under Act of Congress of - 
March 8, 1879 
