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EVOLUTION OF ANIMALS 



Part V 



Fig. 30.34. The "red spider," Tetranychus telariiis, of plants is a mite that covers 

 the leaves with silk and sucks out the sap. A, the mature female; B, the egg; C and 

 D, larva and nymph; E, the fully developed nymph just before its last molt and 

 maturity. (Courtesy, Matheson: Entomology. Ithaca, N.Y., Cornell University 

 Press, 1944.) 



Fig. 30.35. The spotted fever tick. Dennacentor andersoni. In its immature 

 stage it is a parasite of rabbits, squirrels, and other rodents — as an adult, a willing 

 parasite of man. (Courtesy, Matheson: Entomology. Ithaca, N.Y., Cornell Uni- 

 versity Press, 1944.) 



