4o6 



ECONOMIC ENTOMOLOGY 



colonization purposes in the field has been much greater than was 

 anticipated at the outset. In the fourth place, the habits of many of 

 the parasites were not well known and had to be determined for 

 American conditions. As a result, many of the parasites reported 

 favorably in Europe were found to be secondary parasites, or unsuited 

 for the task in hand (Figs. 255-257). 



The parasites of the Gypsy and Brown-tail Moths may be grouped 

 as follows: 



(I = Imported, N = Native, C = Chalcid, T = Tachinid, Ic = Ich- 

 neumon, Ca = Carabid.) 



From Melrose Highlands, Mass., where the parasite laboratory is 

 located, not only have the parasites and the predaceous Calosoma 

 sycophanta been distributed throughout the infested areas of New Eng- 

 land but also into New Brunswick and other eastern provinces lying in 

 the probable zone of infestation. 



Hewitt introduced into Canada in 191 o the European ichneumonid, 

 Mesoleius tenthredinidis Morley, to combat the larch saw-fly. The 



