British Homoptera-Cicadina. 53 
Widely distributed, but notcommon. There seems to 
be room for considerable doubt whether this species is 
really distinct from the preceding. 
14. Deltocephalus socialis, Flor. 
Deltocephalus socialis, Flor, Rhyn. Liv., i1., 242, 5; 
Marsh., Ent. Mo. Mag., i1., 250, 4; Kirschb., 
Cicad., 148, 118; Fieb., Syn. Eur. Delto., 5, 8, 
fig.8; J. Sahl., Not. Fenn., xii., 312, 8; Scott, 
Ent. Mo. Mag., xii., 278, 14; Ferrari, Cicad. 
agri Ligust., 69, 3. 
D. quadrivittatus, Marsh., l. c., 221, 1. 
Jassus socialis, Thoms. Opuse. Ent., 1., 73, 60. 
Crown a little longer than its basal width, nearly twice as long 
in the middle as at the sides, free side very feebly arcuate, angle 
blunt; white, with rust-yellow blotches; interocellar line repre- 
sented by a point near each ocellus, and a pair of triangular black 
spots on the apex. Frons brown, the side-lines, a middle stripe on 
the lower half, and the apex, yellow. Pronotum one-third to one- 
half shorter than the crown, pale brown, with five linear white 
stripes. Elytra dirty yellow, shorter than the abdomen, widely 
rounded at the apex; nerves white, but not anywhere dilated, the 
areas, especially towards the apex, faintly margined with fuscous. 
Abdomen above yellow, its basal half, a linear stripe down each 
side, and some traces of a double line down the middle, black; 
upper side of the pygofer in the male with a large roundish black 
spot on each side. Legs yellow, with black points and narrow 
black bands and stripes. ¢; genital plates rather more than twice 
as long as the valve, yellow, each bearing a large black patch at 
its separately rounded apex; lateral lobes of the pygofer inflexed, 
connivent. 9; hind margin of the last ventral segment rather 
strongly concave, with a small angular black-bordered notch in 
the middle, not reaching half the length of the segment. Length, 
23—3 mm. 
Widely distributed, but local. In the macropterous 
form all the areas of the elytra are more or less broadly 
margined with black. 
15. Deltocephalus sabulicola, Curt. 
Aphrodes sabulicola, Curt., Brit. Ent., p. and pl. 633. 
Deltocephalus sabulicola, Marsh., Ent. Mo. Mag., u1.., 
951,'7 3 Bieb., Syn. Hur. Delt:; 12, 29, fig. 29.; 
Scott, Ent. Mo. Mag., xii., 272, 12. 
D. arenicola, J. Sahl., Not. Fenn., xii., 348, 32. 
