British Homoptera-Cicadina. 79 



Scutellum more than three times as long as pronotiim, apex 

 reflexed ; side keels fine, parallel, obsolete behind. Elytra whitish 

 hyaline, twice as long as abdomen ; nerves pale at the base, darker 

 behind, distinctly and moderately closely grauiilate throughout, 

 mai'ginal nerve of membrane black. Abdomen black, sides 

 naiTowly yellowish. Pygofer large, prominent, black, its hind 

 margin generally edged with white below. Viewed from above 

 the upper notch is wide and deep, scarcely angular at the base, its 

 edges forming a right angle, or nearly a right angle with the hind 

 margin. Styles spreading almost horizontally, their apex reflexed. 

 Teeth of anal tube long, vertically connate. Head, pronotum, and 

 scutellum frequently entirely black or pitch-black. 



$ . Black ; facial keels, pronotum, scutellum, and sides of the 

 abdomen, pale brownish yellow. Elytra yeUowish hyaline. Body 

 frequently entirely yellow, except the upper side of the abdomen 

 near the base. Length, 3^ — 4^ mm. 



Brachyxiterous form. — ^ , ? . Varying in colour from pale 

 brownish yellow to pitch-black, but sometimes the coloration of the 

 fore parts mentioned above is developed in the male. Scutellum 

 more than twice as long as pronotum ; keels distinct, diverging 

 behind. Elytra about as long as abdomen, apex narrowly rounded, 

 nerves strong, closely set with conspicuous black granules. Length 

 2^—3 mm. 



This excessively variable and abundant species may 

 be readily identified by the characters derived from the 

 male genitalia. 



31, Lihurnia discolcyr, Boh. 



Delphax discolor, Boh., Sv. Ak. Handl., 61,26 (1849) ; 

 Flor, Ehyn. Liv., ii., 63, 15 ; Fieb., Grundz. 

 Delph., t. 8, fig. 19 (<? genitalia). 

 D. patens, Kirschb., Cicad., 36, 37- 

 Lihurnia discolor, Scott, Ent. Mo. Mag., vii., 27, 21 ; 

 J. Sahl., Not. Fenn., xii., 441, 12 ; Fieb., Cicad. 

 d'Eiir., pt. iv., 3, 1. 

 Black ; keels of head and pronotum yellow, hind margin of the 

 latter generally narrowly white in the male ; elytra pellucid, pale 

 brown, marginal nerve paler. Scutellum about twice as long as 

 pronotum ; side keels strong, divergent. Elytra about one-half as 

 long as abdomen, widely rounded behind; nerves strong, their 

 granulation indistinct. Pygofer (male) large, prominent, black, 

 the upper notch, viewed from above, large, deep, round at the base, 



