6 INSECTS OF ECONOMIC LMPORTANCE 



One of the interesting and effective groups of 

 parasitic insects is the tachinid flies (Family — 

 TacJii]iidcc). 



Probably the greatest number of parasites is 

 found in the order Hymenopfera. For example, 

 the ichneumon-flies, braconid-flies, chalcis-flies and 

 the proctotrypid-flies. 



ENTOMOLOGICAL LITERATURE 



No one volume could contain descriptions of a).' 

 insects. 



Fifty thousand or more described species from 

 N. A.. 



Descriptions and life histories would fill 150 

 volumes. 



OUR MAIN SOURCES OF INFORMATION 



1. Bulletins of the dift'erent state experiment 

 stations throughout the United States. 



2. Bulletins of the U. S. Bureau of Entomology, 

 Washington, D. C. 



3. Farmers' Bulletins of the U. S. Dept. Agri- 

 culture, Washington, D. C. 



4. Yearbooks of the U. S. Department of Agri- 

 culture, Washington, D. C. 



5. In New York State the bulletins of the State 

 Entomologist, Education Building, Albany, N. Y. ; 

 the bulletins of the State Experiment Station, Ge- 

 neva, N. Y. ; and the bulletins of the Cornell Uni- 

 versity Experiment Station are available sources of 

 information. 



SOME BOOKS 



Manual of Fruit Insects, by M. V. Slingerland 

 and C. R. Crosby, Macmillan Co. 



