18 ILLINOIS NATURAL HISTORY SURVEY CIRCULAR 39 



some insects hide away and demand of the collector a keen and 

 careful search. 



2. Tear apart bunches of leaves, roots, and other debris that 

 may have piled up in front of a rock or log, or that may have 

 accumulated at the end of a root or branch dangling in the water. 



3. Pick out bunches of aquatic plants and search through 

 them carefully. 



4. Sift mud, sand, or gravel taken from the bottom of the 

 lake or stream. 



5. Remember that some insects build cases and hide in them 

 when disturbed. It takes a practiced eye to see these without 

 waiting for the bug to dry out enough to make it squirm along 

 with its case in search of its habitat. 



SENDING INSECTS FOR IDENTIFICATION 



Many insects attack agricultural crops, stored products, 

 domestic fowl and animals, and man himself. Frequently, it is 



Fig. 9. — Pill box for sending economic insects for identification. Put in 

 enough cotton packing to keep the specimen from rattling about but not 

 so much that it crushes the specimen. Do not send specimens through the 

 mail in an envelope, unpacked. 



