30 BRITISH CICADiE. 



abdominal segment. Male genital valve below, large, 

 and semi-cylindrical. 



The brachypterous female is much larger than the 

 fully-winged male. Taken on swampy land in July. 

 It is not uncommon on the marshes at Lee, Middlesex. 



Size, 5*00 to 6*0 millimetres, or 0*19 to 0-23 inches. 



Genus X.— LIBUENIA, Stal. 



Face with one middle keel, not distinctly furcate on 

 the forehead. Antennae not foliaceous. First and 

 second joints rather cylindrical; first shorter than 

 the second. Pronotum and scutellum with side keels 

 diverging, yet reaching to the posterior margin of 

 pronotum, Scutellum with three keels. Elytra and 

 wings usually only partially developed. The males 

 usually are fully winged. Hind tibiae with an upper 

 and lower tooth on the outer edge. A large laminated 

 spur is attached to the extremity of the hind tibiae. 



Mr. J. Edwards describes fifty British species. They 

 are generally small, and some are difficult to separate. 

 Attention must therefore be given to minute characters. 



LiBURNiA NOTULA, Germ. Plate IX., figs. 1 to 4. 



Delphax notula, Germ., Flor., Marsh. 



,, truncatipennis, Kirschb., Boh. 



,, lineola, Stal. 

 Megamellus notulus, Fieb., G. D. 519, t. 8, fig. 2, Sahl. 

 Lihurnia notula, Scott. Edw. pt. i. 61. 



Side keels of the pronotum reaching to its hind 

 margin. Basal joint of the antennae two-thirds of the 

 second joint. Basal joint of the hind tarsi longer than 

 the two others taken together. Scutellum as long or 

 longer than the pronotum. Elytra of the macropterous 

 female one-third longer than the abdomen ; colour 

 greyish green ; veins black. Elytra of the brachypterous 

 female only one-third the length of the abdomen. Frons 

 brown or yellowish. In the dark specimens the keels 



