SAHLBERG S CLASSIFICATION. XXXYll 



The first of these comprises " Les Clianteuses," or 

 cliirpers, of Latreille ; tlie second and third comprise 

 " Les Mnettes " of the same antlior, and are equivalent 

 to his Cicadelles and the Jassidae of others. 



Francis Walker, in his ' Catalogue of Homopterous 

 Insects in the British Museum,' groups the Cicadidae 

 thus : — ■ 



Khynchota Homoptera. 



CicADiNiE. — Cicada. Phytophthires. — Aphidida3, 

 Coccid^e, Psyllidse. Physapoda. — Thripidae. 



The order Cicadina he divides into families Stridu-- 

 lantia, Fulgorina, Memhracina, and Cicadellina. 



The whole Tribe has been divided by Mr. Pascoe, in 

 his useful Manual, into thirteen sub-families ; and 

 Mr. MacLachlan recently, in the last edition of the 

 ' Encyclopaedia Britannica,' mainly adopts the same 

 classification. 



These sub-families are : — Cicadidae^ Fulgorida)', 

 Lystridae, Cixiidas, Tettigonidae, Issidae, Derbidae^ 

 Flattidae, Tettigometridae, Membracidas, Cercopidae, 

 Ledridae, Jassidae. 



Dr. John Sahlberg, in 1871, grouped the Scandina- 

 vian Cicadina on very much the same plan, but he 

 added to the above sub-families Ulopidte, Paropidae, 

 and Scaridae ; and this scheme has been adopted by 

 Dr. Franz Fieber and our later systematic authors. 

 M. Victor Signoret, in his ' Essai sur les Jassides/ 

 published in 1878, took the Catalogues of Fieber and 

 Puton for a basis of his investigation ; but he made 

 several alterations in the disposition of some species ; 

 ascribing considerable importance to the position of 

 the ocelli, which, he remarks, are very constant, and 

 " not often difficult to find." 



Here it may be noted that the characteristics often 

 thought to be of the highest importance in general 

 classification do fail in cases in which the species con- 

 siderably vary amongst themselves. 



Under such difficulties, minor characteristics may 



