38 BRITISH CICADA. 



LiBURNiA GUTTULA, Gevm. Plate XII., figs. 5 to 8. 



DelpJiaxguttula,Gen-n.; Curt.; Flor; Marsh. ; Kirsch. 

 Kelisia guttula, Fieb., G. D. t. 8, fig. 4, and C. E. 



pt. iii. 22. 

 Lihurnia guttula, Scott ; Edw. pt. i. 64, fig. 13, pi. ii. 

 Stenocarenus guttula, Sahib. 



Brachypterous form, with vertex, pronotum, and 

 scutellum almost concolorous yellow. The sides of 

 the pronotum sometimes seen with faintish dark 

 markings. Legs ochreous-yellow. 



Macropterous form : — General colour ochreous. 

 Vertex square and rather prominent before the eyes. 

 Posterior margin of the pronotum sinuous. Scutellum 

 about equal in length to the pronotum. Keels faintly 

 marked. 



Abdomen robust, with several slender transverse 

 streaks. Pygofer with very complex appendages. The 

 male genitalia long and prominent. The anal process 

 ends with a peculiar oval, notched, tubercle. Styles 

 gladiiform. The penis is curved like the coiled ver- 

 nation of some ferns, and there are also added to this 

 apparatus two long setiform organs, all of which details 

 are enclosed in a spatulous sheath, inserted between 

 two valvular plates. Elytra transparent and colour- 

 less, with yellow nervures, and a black triangular patch 

 at the apex, giving to the insect its specific name. 



L. guttula in many respects resembles L. vittipcnnis, 

 but there are several differences of note. The anal 

 process is somewhat like in both insects, but the geni- 

 talia differ, as may be seen in Plate X., figs. 3 to 5, 

 and Plate XII., figs. 7 and 8. L. vittipcnnis also is a 

 larger insect, has longer wings, and also has more 

 pronounced thoracic markings. 



The Macropterous form is rarely met with in 

 England. My drawing is from a specimen taken by 

 Mr. Edwards, at Stratton Strawless, in Norfolk. 



