1920] 



Dozier: Insects of Florida 



349 



floridensis, was found infesting a branch of Pinus palustris, but 

 this is of unusual occurrence. (Fig. 19). 



Aphids are plentiful, together with their parasites and pre- 

 dators on the different trees and shrubs To be particularly 

 noted are the hickory Phylloxera galls and the large black pine 

 aphid, Lachnus pint. The latter is parasitized by the hymenop- 

 teron, Aphidius hifasciatiis. A clear and extremely interesting 



Fig. 18. Galls of Andricjis virens Ashm. on live oak, Querciis virginiana. 



case of symbiosis exists between this aphid and its attendant 

 ants. 



Beneath and in the bark of the fallen pine are to be found the 

 numerous galleries of the Scolytid bark beetle, Ips calligraphus 

 (Fig. 20). Here are found many other insects, such as the 

 buprestid borers, Chalcophora and Buprestis, and the wire- 

 worms, Adelocera marmorata and Elater hepaticus. 



