INJURIOUS INSECTS OE 1904. 



18? 



Fig. 1 71. ^Imperfect Galls on Leaves of Soft Maples. Original. 



July 20th and 25th. On August ist we found fresh galls contain- 

 ing larvae on the maples, and assume from this and the date of 

 emergence of flies in the breeding jars that this represents another 

 brood of maggots, possibly the second. Maggots were found at 



Fig. 172. — Fly Raised from Galls in Soft Maple Leaf. Much enlarged. Original. 



work on the maples as late as August 25th. Later examinations, 

 September 4th, failed to disclose any eggs, larvae or pupae, and the 

 work of the fly had evidently stopped for the season. I believe 

 we are safe in stating that there are at least two broods of this fly 

 in this locality. 

 12 



