British Homoptera-Cicadina. 47 



The genera may be thus distinguished : — 



Pronotum with a horn on each side ; hind process 



sinuate . . . . . . . . . . . . i. Centrotus. 



Pronotum without horns at the sides ; hind process 



straight . . . . . . . . . . . . ii. Gargara. 



i. Centeotus, Fab. (PI. L, fig. 11). 

 Fab., Sys. Ehyn., 16, 3 (1803). 

 Lateral angles of pronotum acutely produced, hind process long, 

 arching over, but not concealing the scutellum. Elytra with 5 

 apical areas. 



1. Centrotus cornutus, Linn. 



Cicada cormita, Linn., Faun. Suec, 239, 879 ; Sys. 



Nat., ii., 705, 6. 

 Memhracis cormita, Fab., Ent. Sys., iv., 14, 22 ; Panz., 



Deuts. Ins., 50, 19. 

 Cicada fiisca, DeGeer, Abh. Geseb. Ins., iii., IIG, 3, 



t. 11, figs. 22 and 23. 

 Centrotus cornutus, Fab., Sys. Rhyn., 19, 15 ; Fall., 

 Hem. Suec, ii., 8, 1 ; Burm., Handb., ii., 132, 1 ; 

 Flor, Rhyn. Liv., ii., 104, 1 ; Marsh., Ent. Mo. 

 Mag., ii., 34, 1 ; Kirschb., Cicad., 67, 5 ; Fieb., 

 Cicad. d'Eur., pt. ii., 10, 1. 

 C. sicidus, gallicus, italicus, turcicus, and ahhreviatiis , 



Kirschb., I. c, 66 and 67. 

 Black, roughly punctured, with fine yellow piibescence. Pro- 

 notum with a fine central keel ; side processes diverging, wide, 

 triangular, deflexed at the apex ; hind process bisinuate, acute, 

 nearly as long as the abdomen. Elytra rugose, fiisco-hyaline, 

 nerves dark brown, on the hind margin in the 5th apical area a 

 fuscous spot. Wings hyaline, nerves dark brown. Abdomen 

 above black, with large shallow punctures. Tibiae reddish yellow, 

 edges of hind pair with a close row of black setiferous granules. 



3". Hind margin of pygofer with a strong triangular tooth. 

 Valve wanting. Plates connate, elongate-triangiilar, with a deep 

 longitudinal impression near the base, and a strong lateral con- 

 striction just below their rounded apex. Two last ventral segments 

 with a fine longitudinal keel. 



5 . Hind margin of last ventral segment with a wide triangular 

 notch, which reaches quite to its base. Length, 7 — 8 mm. 



Not uncommon in woods. 



