Ii^ NOV 17 1939 ^\ 



VOLUME FIFTEEN NUMBER TWO 



JOURNAL 



OF 



ENTOMOLOGY 



AND 



ZOOLOGY 



JUNE, 1923 



PUBLISHED QUARTERLY BY 



POMONA COLLEGE DEPARTMENT o/ ZOOLOGY 



CLAREMONT, CALIFORNIA, U. S. A. 



CONTENTS 



Page 



Nervous System axd Sense Orcaxs, XIII — ff\ A. Hil/on 17 



Notes on the Early Stages of the Syrphid Genus Microdin 



(Diptera)— T. R. Cole 19 



Notes on California Bombyludae with Descriptions of New- 

 Species— T. R. Cole 21 



Notes on the Color Changes of Frogs — Sarah Mnrimon 27 



Entered Claremoiit, Cal.. Post-Office Oct. 1. isio. as second-clasa matter, uijder Ait ul Coiigrtsb of 

 Vlarcb 3. ISTU 



