Hemiptera 



193 



true larvse differing in form from their parents, and in 

 one family (Coccidcg) there is a passive stage before 

 the last moult, forecasting the pupa of the higher 

 orders. 



In the first six families the feet have three segments (l2l). 

 Cicadidae. — The Ckadid,£ (Cicads) are a family of (mostly) large 



Fig. 107. — Head of Cicad from side. I. face ; II, base of mandible ; III. 

 base of ist maxilla; IV. 2nd ma.xillcE ; V. pronotum. Magnified. 

 From Marlatt, Bull. 14 (n.s.) Div. Ent. U.S. Dept. Agr. 



insects distinguished from other Homoptera by the front thighs 

 being thickened and toothed beneath. The head is broad with 

 prominent compound eyes, and three simple eyes on the crown. 

 The wings are large and powerful with a regular system of branch- 

 ing nervures and cells; the front pair are much larger than the 

 hind pair. The abdomen tapers towards its hinder end (fig. 86). 

 The male Cicads produce their well-known shrill song by the 



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