Economic Importance of Animals 561 



Order 14 — Dermaptera: Earwigs (Fig. 293) feed on flowers and 

 fruits at night but are rare in the United States. They are said to have 

 damaged the eardrums of human beings by their pincerlike structures 

 at the tip of the abdomen. 



Fig. 291. — Woolly apple Aphid (Eriosoma lanigera) of the order Homoptera. 

 a. Agamic female; h, larval aphid; c, pupa; d, winged female with the antenna 

 enlarged above. All are greatly enlarged and with, the customary woolly, waxy 

 excretion removed. (From Marlatt: The Woolly Aphis of the Apple, U. S. De- 

 partment of Agriculture; courtesy Department of Entomology and Plant Quar- 

 antine. ) 



Fig. 292. — The periodical cicada {Tibicina septendecim) of the order Homop- 

 tera. a, Adult; b, adult, side view; c, shed pupal skin. (From Marlatt: The 

 Periodical Cicada in 1911, U. S. Department of Agriculture; courtesy of De- 

 partment of Entomology and Plant Quarantine.) 



