INSECTS 255 



above means the ichneumons save millions of dollars yearly to our 

 country. 



Reference Books 



FOR THE VVVllj 



Davison, Practical Zoology, pages 52-68. American Book Company. 

 Herrick, Text-book in General Zoology, Chap. XV. American Book Company. 

 Jordan, Kellogg, and Heath, Animal Studies, Chap. XXII. D. Appleton and 



Company. 

 Needham, Outdoor Studies. American Book Company. 



FOR THE TEACHER 



Comstock, Insect Life. D. Appleton and Company. 



Lubbock, Ants, Bees, and Wasps. D. Appleton and Company. 



