308 



FOREST ENTOMOLOGY. 



brief account of them is intended only for a formal introduction to the 

 family as associated with forest trees. 



It has been remarked that they are very closely allied to Aphididpe, 

 hence Buckton adopts the term Tettigidce. The following table,^ which 

 is perhaps chiefly of a microscopical character as regards tarsal struct- 

 ure, may therefore be given — viz. : 



Order RHYNCHOTA. 

 Sub-Order HOMOPTERA. 



Section I. 

 MoNOMERA (Westw.) 



Section II. 

 DiMERA (Westw. ) 



Aleyrodina\ 



AphidintC. 



Section III. 

 Trimera (Westw.) 



PsyllidcC. 

 Thripidae. 



In size the British Cicadidae show a considerable resemblance to the 

 Aphididse, but the most striking contrast is with regard to the -wings, 

 which are coriaceous, more especially the upper wings or elytra. This 

 characteristic almost obliterates the venation. The under wings are 

 also coriaceous, but not so dense as the upper. 



The head is always more rounded than in the case of the Aphididse 

 — in fact, it may be termed frog-shaped. The antennse are never very 

 long : they are extremely slender, so much so that even under the 

 microscope the joints are very difficult to count. 



The insect feeds by means of a short proboscis, which is variable in 

 length but always three-jointed. 



No cornicles are ever found on the body, nor any organs for secret- 

 ing special exudation as a protective covering. 



The legs contrast with the Aphididaj, inasmuch as they are well 

 adapted for leaping, the femorse and coxa^ having powerful muscles. 

 The tarsi are three-jointed, but this is sometimes rather difficult to 

 determine by observation. 



^ From Monograph of the British Cicadte or Tettigid; 

 Buckton, vol. i. p. xxxiv. 



by George Bowdler 



