120 



BRITISH CICADA. 



Idiocerus aurulentus, Kirschb. 



Mr. Edwards remarks this to be a very variable spe- 

 cies " nearly allied to I. vitreus, but it does not appear 

 ever to develop the white H so conspicuous on the 

 elytra of that species." Herr Paul Low says that out 

 of eight specimens in his cabinet no two are alike in 

 colouring. Mr. Edwards seems, in 1883, to have 

 examined only a single example. 



It has been taken at Cossey, Norfolk, on the Lom- 

 bardy poplar. 



In concluding the diagnosis of this genus I append 

 a synoptical sketch, as a possible help towards the 

 discrimination of the species. 



Synopsis of the Idioceri, 



Frons I ^'^^^^^^'^ "with orange in the male 



(Trapezoidal ... 

 Gulae Pubescent 



(Brown, and ringed with pale margins ... 

 Abdomen \ 



(Brown, and not ringed 



Pygofer 



Elytra 



Apex of the male ph;mose or fringed 

 Apex with cornua 



"With bands 



I^ochreous 



Of uniform tint- whitish green 



(bronzy green 



Without bands, but suffused with brown 



.With dark dashes; nervures piebald 



Costee With teeth or blunt spines. 



populi 



poecilus 



Herrichii 



confusus 

 j poecilus 

 \ nubilis 



fulgidus 



distinguendus 



litiu'atus 



nubilis 



(tremulse 

 distingiiendus 

 elegans 

 laminatus 

 confusus 

 albicans 

 nubilis 

 elegans 

 fulgidus 

 populi 

 .adustus 



Ivarius 

 Herrichii 

 lituratus 

 distinguendus 

 pce.cih;s 

 tibialis 

 adustus 



