THE CONTROL OF INJURIOUS INSECTS 407 



results have been fairly satisfactory. In 1908 the egg parasite, Tetra- 

 stichus xanihomelcencB, of the elm leaf beetle was introduced into New 

 England from France. The results are not conclusive although the 

 parasite has multiplied and spread slightly. 



Other examples of the introduction of parasites to combat injurious 

 insects might be cited of which many have been unsuccessful. The 

 valuable experience gained in the Gypsy and Brown-tail experiments 

 will no doubt be utilized in future work of this nature and more successes 

 will probably be recorded. 



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