28 INTERRELATIONS OF PLANTS AND ANIMALS 



pairs of wings, but the first pair form hard covers meeting in a 

 straight Hne in the middle of the back, the second pair of wings, 

 when at rest, being covered by them. Beetles are frequently 



found on goldenrod blossoms. 

 Try to discover members of 

 the six different orders named 

 above. Collect specimens 

 and bring them to the labo- 

 ratory for identification. 



Other animals which may be 



found are spiders, with four 



of walking legs, and 



Weevil. Ladybird. Calasoma beetle. 

 Coleoptera. 



pairs 



centipedes and millepedes, both of which 



are wormlike and have many pairs of legs. 



Why do Insects live on Plants? — We 



Centipede. 



Spider. 



have found insect life abundant on living green plants, some 

 visiting flowers, others hidden away on the stalks or leaves of 

 the plants. Let us next try to find out why insects live upon 

 flowering green plants. 



The Life History of the Monarch Butterfly. — If it is possible 

 to find some milkweed on our trip, we are quite likely to find hover- 

 ing near, a golden brown and black butterfly, the monarch or milk- 

 weed butterfly (Anosia plexippus). Its body, as in all insects, is 

 composed of three regions. The female monarch frequents the 

 milkweed in order to lay eggs ; she may be found doing this at 

 almost any time from June until September. 



Egg and Larva. The eggs, tiny hat-shaped dots a twentieth of 

 an inch in length, are fastened singly to the under side of milkweed 

 leaves. Sorae wonderful instinct leads this butterfly to deposit ber 



