168 



INJURIOUS INSECTS OF igo.r 



AN OAK LEAF MINER. 



Fig. lOG. — Oak leaf infested with L. hamadryadeila, Clem. Original. 



Fig-. 1 06 illustrates the appearance of the leaves of the White 

 Oak infested this season with a leaf miner, known as Lithocollctis 

 hainadryadcUa, Clem. The linear serpentine blotches are not 

 made by this species, but by another miner. 



Leaves of oaks, notably the White Oak, suffered materially 

 this season in this way. Curiously enough, the entomologist 

 only noticed it in the vicinity of the Twin Cities, though it was 

 looked for in other parts of the state. The larva, figured below, 

 which lives in the mine, passes the winter in the leaf as it lies on 

 the ground. Raking up and burning the leaves, therefore, is a 

 good preventive measure, lessening the number of moths which 

 would otherwise issue the followinsf season. 



Fig. 107. — Larva of the above miner, enlarged S times. Original 



