54 IMPORTED PARASITES. 



cannot be considered as of much promise; and two (Tricho- 

 gramma and Pteromalus) have been given every opportunity to 

 prove their worth, but have not responded at aU satisfactorily. 



There are, however, ten or twelve European parasites differ- 

 ent from any known to attack the brown-tail in America, and 

 which include several of great promise, which will be of material 

 assistance in reducing the present prevailing abundance of their 

 host, if they prove adaptable to American conditions. 



In Table 5 are listed all of the known parasites of the brown- 

 tail moth which play any considerable part in effecting its 

 control. The names of the native American species are in 

 black-faced type; those of European species which have been 

 imported in satisfactory numbers and colonized under favorable 

 conditions are in Roman type; while those of the European 

 species which have not yet been received under satisfactory 

 conditions are italicized. 



Ifearly all of the introduced species have been recovered from 

 the field, but not all of them are known to be firmly established. 

 Three of them, Monodontomerus, Tachina and Compsilura, are 

 promising parasites of the gypsy moth also. 



