INSECTS, AND THEIR RELATION TO MAN 179 



Riley , C. V. , " Directions For Collecting and Preserving Insects." Bulle- 

 tin U. S. National Museum, Part F., No. 39, 1892. 



"Spiders." Cornell University Nature Study Quarterly, No. 9, May, 

 1901. 



Comstock, A. B., " Some Tent Makers." Teacher's Leaflet 5, Nature 

 Study, Cornell University. April 10, 1898. 



Wheeler, W. M., Ants, Their Structure, Development, and Behavior. 



McCook, H. C., Ant Communities. A Study in Natural Civics. 



Gibson, Wm. H., My Studio Neighbors. Insect Relationship, Ecology, 

 etc. 



Kellogg, Vernon L. , American Insects. 



Kelleher, "Silk Worm Rearing as a Popular Pursuit." The Guide to 

 Nature, Stamford, Conn., December, 1908. 



Felt, E. P., "Collection, Preservation and Distribution of New York 

 Insects." Bulletin 26, New York State Museum, 1908. 



Comstock, A. B., "Hints for Collecting and Preserving Insects." 

 Teacher's Leaflet 7, Nature Study, Cornell University. 



Comstock, J. H., Manual for the Study of Insects. 



Insect Life. 



Comstock, A. B., Ways of the Six-footed. 



Weed, C. M., Nature Biographies. 



Sharp, D. L., Wild Life Near Home. 



Banks, Directions for Collecting and Preserving Insects. Bulletin 67, 

 U. S. National Museum, 1909. 



PROBLEM XXXI 



How insects became winners in life's race. (.Shifts for 

 a living -Y 



a. Protective Resemblance 



Observations. 1. Examine a green katydid on a green- 

 leaved twig. Is it easy to distinguish it from the leaves ? 



2. Examine a " walking stick " on a twig. Is it easy to 

 tell it from the twig ? 



3. Note a kallima or "dead leaf" butterfly on a twig. 

 What does it resemble ? 



Conclusions. 1. Of what advantage is it to the katydid 

 that it resembles the green leaf ? 



lr This problem may be made the basis of a museum trip. 



