British Homoptera-Cicadina. 



115 



13 (14 



14 (13 



15 (12 



16 (7 



17 (22 



18 (19 



27 (32 



28 (29 



29 (28 



30 (31 



31 (30 



32 (27 



10. 



11. 



pacilus. 

 tibialis. 



Inner edge of the wide pale band on the 

 elytra commencing in the middle of the 

 inner margin .. .. .. ..6. viduatus. 



Inner edge of the narrow pale band on the 

 elytra commencing at the apex of the 

 clavus 7. elegans. 



First subapical area reaching about half as 



far backward as second . . . . . . 8. laminatus. 



Elytra without pale transverse bands. 



Apex of anal nerve standing in an oval 

 white patch. 



Cubital nerve only marked with white in 

 the lower boundary of the second sub- 

 apical area .. .. .. .. ..9. lituratus. 



Cubital nerve chequered with black or rust- 

 colour and white. 



Frontal suture sharply bent inwards at the 

 base of the antenna;, the frons therefore 

 subtrapezoidal 



Frontal suture evenly curved outwards 

 throughout, the frons therefore sub- 

 orbicular 



Apex of anal nerve white, but not standing 

 in an oval white patch, or nerves entirely 

 white. 



Brachial nerve with a white streak near the 

 apex. Face in the male with a small sharp 

 tooth on each side of the apex of the 

 clypeus. 



First transverse nerve white . . . . 12. 



First transverse nerve not white . . . . 13. 



Brachial nerve not marked with white. 

 Apex of face simple in both sexes. 



Elytra green or greenish grey, more or less 

 tinged with reddish brown towards the 

 suture. 



Side margins of face angularly indented 



below the eyes. Inhabits poplars . . 14. fulriidus. 



Side margins of face at most faintly sinuate. 



Male with the face and legs generally much 

 suffused with orange-yellow. Female with 

 about one-sixth of visible length of saw- 

 case projecting. Inhabits aspen 



Male without orange coloration. Female 

 with about one-third of visible length of 

 saw-case projecting. Inhabits sallow . . 



Elytra greenish white or almost milk-white, 

 nerves entirely white. Inhabits white 

 poplar .. .. .. .. ..17. (lUiicdus 



vitrens. 

 aurulentus. 



15. 



16. 



populi. 

 confusn.'^ 



