64 BRITISH CICADA. 



Deltocephalus socialis, Flor. Plate LI., figs. 4 to 4^. 



Deltocephalus socialis, Flor; Marsh.; Kirschb. ; Fieb., 

 S. E. D. fig. 8; Sahib.; Scott; Edw. pt. ii. 

 p. 53. 



D. quadrivittatus, Marsh. 



Jassus socialis, Thorns. 



Male. General colour ochreous. Shape of the head, 

 with the eyes, equilateral. Vertex pointed, with a dark 

 line bordering the apex. Inter-ocellar line indicated by 

 a point at each ocellus ; these points, however, are not 

 always to be seen. Pronotum semicircular in form, 

 with four oblong stains, marking out five pale vertical 

 lines. Scutellum nearly spotless. Abdomen robust, 

 orange-yellow, with broad brown bands. The penulti- 

 mate segment shows two black spots. Apex fringed 

 and cleft, with two black lateral valves. Lower margin 

 of the genital plate rounded. Elytra shorter than the 

 abdomen, dirty ochreous-brown, with clouded areas, 

 and the nervures, indicated by broad pale borderings. 

 Legs ochreous-yellow. Middle and hind tibiae with 

 one inner stripe. Hind tibias with black points and 

 ochreous setae. Under side almost wholly black, except 

 the coxae and the legs. Frons pale brown, with darker 

 transverse bars. 



Female. Larger and paler in colour than the male ; 

 uniformly ochreous, with much shorter elytra. The 

 pygofer, seen from above, is cleft, and provided with a 

 blunt interior tooth. Viewed more from behind, it 

 shows a stout cylindrical cauda. The pygofer of the 

 male does not exhibit the singular form of the oedeagus 

 and apparatus noted in the male of D. distinguendus. 



Externally, to the naked eye, this insect in many 

 respects resembles D. distinguendus, and this similarity 

 may also be seen even when we compare the diagnosis 

 of the two species as given in Edwards' Synopsis. 

 The differences, as there given, may be stated in great 



