Uninersitg of Raiite 



ORONO 



BULLETIN 263 



AUGUST, 1917 



SYRPHIDAE OF MAINE-SECOND REPORT 



CONTENTS. 



This bulletin discusses the life history of the following 

 beneficial Flower-flies, all of which feed in the larval stage on 

 aphids : 



Xanthogramma divisa Williston,. 



Syrphus oronoensis n. sp., 



Platychirus perpallidus Verrall,. 

 Syrphus knabi Shannon, 



PAGE 



154 

 162 



167 

 172 



