VOLUME FIFTEEN NUMBER TWO 



JOURNAL 



OF 



ENTOMOLOGY 



AND 



ZOOLOGY 



JUNE, 1923 



PUBLISHED QUARTERLY BY 

 POMONA COLLEGE DEPARTMENT 0/ ZOOLOGY 



CLAREMONT, CALIFORNIA, U. S. A. 



CONTENTS 



Page 



Nervous System and Sense Organs, XIII — W. A. Hilton 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 Marimon 27 



Batered Claremoat, Cal., Post-Office Oct. 1, IVIU. as secoDd-<.'lass matter, under Act of CoL^ress of 



March S, 18TW 



