British Homoptera-Cicadina, 59 



29 (28). The dark margin of the facial keels not 



extending to those of the crown. Styles 

 subulate, their ciliate inner margin with 

 a strong sharp tooth near the base . . 13. sordidula. 



30 (27). No pale stripe down the crown, pronotum, 



and scutellum. Face black between the 

 keels, or keels margined with black. 



31 (32). Hind margin of pygofer with a wide arcuate 



notch . . . . . . . . . . 14. elcgantula. 



32 (31). Hind margin of pygofer not notched. 



33 (34). Styles diverging, their apex pointed . . 15. cUstincta. 



34 (33). Styles incurved, their inner apical angle 



produced into a sharp tooth ; outer apical 

 angle produced and bluntly rounded . . 16. BoldL 

 85 (26). Facial keels not white. 



36 (39). CroAvn yellow or clear brownish yellow. 



37 (38). Central facial keel obsolete on the forehead 17. Sigiioreti. 



38 (37). Central facial keel distinct on the forehead 18. adcla. 



39 (36). Crown brown. 



40 (41). Scutellum beyond the side-keels black ; face 



(except the forehead) black (brachypterous 



male). Nerves non-granulate .. .. 19. melanupacliys. 



41 (40). Scutellum generally without dark markings. 



Nerves non-granulate. 



42 (43). Elytra clear brownish yellow ; nerves strong, 



with concolorous granules, marginal nerve 



pale . . . . . . . . . . . . 20. ximilis. 



43 (42). Elytra smoky yellow; nerves brown with 



concolorous granules . . . . . . 21. capnodcs. 



44 (21). Crown not longer than wide. 



45 (90). Crown square. 



46 (89). Hind tarsi shorter than the tibiffi, basal 



joint subequal in length to the other two 

 together. 



47 (48). Scutellum pale brownish yellow, with a black 



spot at the base on each side of the 



middle keel, beyond the side-keels entirely 



black . . . . . . . . . . 22. scutellata. 



. Scutellum not pale, with distinct black 



markings. 

 Elytra pitch-brown, their truncate hind 



margin with two white spots. 

 Tibiffi brown, with three pale rings . . 23. lepida. 



Tibiffi brownish, without pale rings . . 24. Fieberi. 



Elytra without white spots on the hind 



margin. 

 Elytra black, hind margin white or yellow. 

 Scutellum yellow. 

 Hind margin of elytra very narrowly whitish 



yellow; abdomen yellow .. .. .. 25. jJi/7/H/((. 



56 (55). Entire margin of elytra narrowly and base 



broadly yellowish . . . . . , . . 26. lujubiina. 



