74 BRITISH CICADA. 



of transverse dots on a paler ground colour. Legs 

 greenish olive. Frons yellow, and covered with fine 

 brown streaks. 



The ventral plate is deeply notched, within which 

 cavity a rounded tooth with two lobes is situated. 

 The genital valves are large, and the point of the saw 

 projects from them. The pygofer of the male is 

 somewhat complex, and when viewed from behind 

 shows a short pointed caudal process, between the 

 two rounded genital plates ; below which the ends of 

 the styles may be seen. 



The genitalia thus differ somewhat in form from 

 those of Deltocephalus distinguenchis. 



Inch. Millimetres. 



Size of male 0-27 6*85 



„ of female 0-28 7*10 



Eare. Tintern, Norwich, in August. 

 My figures are from Mr. Douglas's and from Mr. 

 Edwards's collections. 



Genus XL.— THAMNOTETTIX, Zetterstedt. 



Body oblong and dilated. Head with the eyes about 

 as wide as the pronotum. Vertex convex and slightly 

 produced. Ocelli (if visible) equally distant from the 

 eyes as they are from themselves. Pronotum rounded 

 on the anterior margin. Elytra much longer than the 

 abdomen, rounded at their apices, with five apical and 

 three discoidal cells. Appendix ample. Wings veined 

 as in Allygus. 



This is a genus much involved in its synonymy. In 

 some species the elytra are more lanceolate, and 

 thus approximate to the next genus. 



