114 [October, 



vol. xviii of this Magazine ; and I, therefore, propose in the present 

 paper to call attention to the five additional species, and to characterize 

 more exactly some of the species previously recorded. 



The following errors in the table above mentioned should be 

 noted, viz. : lituratus = adustus, ? ; Heydenii = poecilus, H.-S. ; and 

 confusus = albicans, Kbm. 



As it is frequently necessary to refer to the neuration of the 

 elytra in descriptions of Cicadina, it is desirable that some intelligible 

 system should be observed. The following system, based on that of 

 Dr. J. Sahlberg, seems most convenient. The elytron is divided into 

 corium, claims, and onemhrane, the latter composed of the apical areas 

 and frequently having a membranous appendix. The longitudinal 

 nerves of the corium are the hradiiae, the simple nerve standing imme- 

 diately above the claval suture, and the cubital, the forked nerve 

 coming between the brachial nerve and the costa ; the branches of 

 the cubital nerve, which are generally forked at the apex, may be 

 designated as inner and outer respectively, according to their position. 

 The nerves forming the inner boundary of the apical areas may be 

 conveniently termed angular nerves, leaving the term transverse to be 

 applied to such other nerves as may occur in such a position as to 

 warrant its application. The longitudinal nerves of the clavus are 

 the anal immediately below the claval suture, and the axillary standing 

 nearest the scutellum. 



It is believed that our British species of Idiocerus are exactly 

 characterized in the following table, but one or two of them will admit 

 of some comment. 



Id. HerricMi. — In the Catalogue of British Heviiptera, published 

 by the Entomological Society of London, this is erroneously given as 

 a synonym of lituratus. It is a handsome greenish-grey species, with 

 the nerves of the elytra chequered with black and white. The 

 whiskers of the ^ are very conspicuous, and the pubescence on the 

 cheeks of the ? is easily seen. It occurs on Salix alba, and is well 

 described by Dr. J. Sahlberg. 



Id. aurulcntus, Kbm. — The single example of this species, taken 

 by my«clf, might well be described as vitrcus, without the white H, 

 but Herr Paul Low, who named it for me, says that of seven or eight 

 examples in his collection, no two are exactly alike in point of 

 coloration, and this is borne out by examples which I have from Dr. 

 Futon. 



With regard to fulyidus, po]yuli, and confusus, as characterized 

 below, 1 believe we are at last in accord with continental entomologists. 



