28 



BRtTISH CtCADM. 



obvious characters. Dr. Flor does as much as words 

 can do towards describing the genital segments ; and 

 Kirschbaum has pubhshed a small, but not easily 

 understood book, ' Die Cicadinen,' in reference to the 

 same subject. 



Out of the sixty-eight foreign Delphacidse enumerated 

 by Fieber, Edwards allows hfty to be British. Scott 

 divides the family into five genera, which plan is adopted 

 also by Edwards. (See 'Ent. Mon. Mag.,' May and 

 June, 1870 ; and also ' Trans. Ent. Soc.,' June, 1886, 

 p. 55.) 



DELPHACID^. 



Basal anteiinal joint much Basal auteunal joint much shorter than the 



second. 



longer than the second. 

 Middle facial keels. 



Middle facial keels. 



One. 



Delphax. 



Two. 



Asiraca. 



One only. 



Keel forked on 

 the vertex, or 

 else entire. 

 Lihwrnia. 



Keel forked 

 before the 

 vertex. 

 Dlcranotropis. 



Two. 



Stiroma. 



Genus VIII.— ASIRACA, Latr, 



Plate VIII., figs. 1 to 7. 



Delphax damcornis, Fab. Spin. 

 Asiraca clavicornis, Curt., Marsh., Kirschb., 

 Fieb., C. E., pt. in., 1 ; Edw. pt. i. 56, 



Scott, 



Frons with two middle keels. Antennal first joint 

 foliaceous, trigonate, prismatic, and nearly three times 

 longer than the second. Second joint somewhat cordate, 

 bristly, and ending with a seta. Pronotum with three 

 distinct keels. Scutellum with four longitudinal keels. 

 Elytra without basal cells. Fore femora and tibiae 

 dilated or flattened, posterior tibiae with three spines 

 on the outer edge. Head and part of the pronotum 

 pale ; the rest of the pronotum and scutellum black, 

 with faint keels and scale-like hairs. Elytra grey, with 

 traces of a white band at the base. Veins yellowish, 



