ISSIDA, 113 
Fam. ISSIDE *. 
This family is now rightly regarded as being merely a subfamily of the Fulgoride. 
Several authors consider that Jssws and its allies bear a close affinity to the Derbide: 
Spinola places them before this family, Amyot and Serville include them between the 
“ Derbides” and the “Acanonides,” and by Stl they are placed between the “ Derbida” 
_ and ‘ Lophopida ” on the one hand and the “ Ricaniida” on the other. The species 
may for the most part be easily distinguished by their short and convex facies; but 
some of them are more or less elongate. The following are the chief characters :— 
Head not or only a little narrower than the pronotum; clypeus with the lateral margin not keeled, usually 
convex, and sometimes much produced beyond the plane of the frons; pronotum with the base sub- 
truncate, and the apex usually rounded and produced; scutellum, as a rule, much longer than the 
pronotum; tegmina coriaceous or somewhat corneous, very rarely vitreous or with vitreous patches 
(as in Neethus), with the humeral angles well-marked, often callose, and the tegule very distinct; wings 
very variable ; legs with or without spines on the posterior tibie. 
The venation of the tegmina falls mostly into two natural divisions: in one the radial vein is forked close to 
the base or not far from it, the exterior ulnar vein is forked at or about the middle, and the interior 
ulnar vein is simple; in the other case the radial and the interior and exterior ulnar veins are all forked 
at varying distances from the base. In the first division the posterior tibie are bispinose, and in the 
second division they are quadrispinose, and this correlation between the venation of the tegmina and 
the number of spines of the posterior tibize seems very significant. 
The wings are either absent, rudimentary, slight, and narrow, or very large and ample, and folded in three 
underneath the tegmina, being notched at the sides to render the folding possible. 
The genital segments and organs sometimes afford good characters, but they require to be worked on the spot 
with living specimens, as the dead ones are apt to become dry and distorted. In many cases it is very 
hard to tell the sex. Spinola (Ann. Soc. Ent. Fr. viii. p. 8343) says :—“ On pourrait se méprendre sur le 
sexe, si la sixiéme plaque ventrale n’existait pas d’ailleurs, et si elle n’était pas, comme dans toutes les 
Fulgorelles males, entiére et annulaire”; but this character does not appear to be constant, or else in 
dried specimens the segment shrinks behind the others. In some cases the difference of sex is quite 
plain, but in others it is by no means apparent in this subfamily, and it is almost impossible to determine 
it without destroying valuable examples. 
The following table refers to the genera of Isside contained in our collection :— 
I. Wings absent or quite rudimentary ; ‘egmina broad and much 
adpressed to the sides . . . . . . . . Hysrerorrerum, Am. et Serv. 
II. Wings narrowed, not folded at rest “and without notches at 
the sides. 
i. Vertex not produced in a process in front of the eyes. 
1. Posterior tibize with two or more spines or teeth. 
A. Tegmina very strongly, coarsely, and confusedly 
veined, as a rule strongly convex, not falcate; 
posterior tibize with two or four spines . . . . . Unrxzs, Stal. 
B. Tegmina with the veins very clear and distinct, form 
subglobular, interior ulnar vein distinctly furcate; 
posterior tibie with four strong spines . . . . . CycLuMNa, gen. nov. 
* By W. W. Fowzer. 
