INSECTA 



477 



are well developed and do not possess a terminal spine (arista) — a 

 feature characteristic of the first series. To this group belong the 



Fig. 329. Lateral views of proboscides of Rhynchota to illustrate the difference 

 between the Heteropterous condition (A), and the Homopterous condition (B). 

 A, Deraecoris fasciolns, modified after Knight. B, Zammara tympimnm 

 (Cicadidae). m. niesothorax; iv. wing. 



scale insects, Coccidae. Females of these are wingless, often scale- 

 like, and devoid of legs. The winged males have atrophied mouth 



