Classification of the Homoptera. 425 



Iloraoptera ; and as these do not exactly correspond with 

 either the families or subfamilies or tribes of modern writers, 

 I have thought it desirable to throw their characters into 

 a tabular form. It will be seen tliat the Phytophthiria, in- 

 cluding- the Aphides, scale-insects, &c. are not here included 

 among the Homoptera. They belong to a lower type, and 

 their habits are very different. Claus, however, is the only 

 modern writer, I believe, who raises them to the rank of a 

 suborder, equivalent to Heteroptera, Homoptera, and Mal- 

 lophaga. Thripidaj (forming the order Thysanoptera of 

 Haliday) are apparently of higher rank ; but they have not 

 ill modern times been regarded as a distinct order. 



In the Table below I have added parenthetically certain 

 names which are found in books, but which seem to me to be 

 unnecessary. 



Males strldiilaut, or with a drumming-apparatus 



{Stridulantia) Cicadid.t:. 



Males not stridulant. 



Autenufe inserted below the eyes (Subferi- 

 conies). 

 Eyes in a cavity of the cheeks {Cam'geni). 

 Exterior margin of the tegmina transversely 



veined (Stri(jiinar(jines) Flatid.^. 



Exterior margin of the tegmina not trans- 

 versely veined [Niidimaryines). 



Head prolonged anteriorly Fulgobid.'e. 



Head not prolonged. 



Pro- and mesothorax together rhom- 



biform IssiD.^. 



Pro- and mesothorax not rhombiform. 

 AntennfB elongate, passing beyond 



the cheeks Derbid^. 



Antennae not passing beyond the 

 cheeks. 

 Anterior Avings transparent .... CrxiiD.B. 

 Anterior wings not transparent. . Lystrid.b. 

 Eyes not in a cavity of the cheeks (P/atiir/eni) TETTiooMEXRiDiE. 

 Antennas inserted in front of the eyes {Anferi- 

 cornes). 

 Prothorax prolonged above the abdomen 



( Cornidorsi) Mrmbbacidje. 



Prothorax not prolonged [Planidorsi). 



Posterior tibiae with a double row of 

 spines (iSem'pcdcs) . 

 Ocelli situated on the anterior part of the 



head Iassidje. 



Ocelli more or less on the vertex. 



Jiodjr elongate Tettigoxiid^. 



Body broadly ovate Lkdhed.e. 



Posterior tibiae without a double row of 



spines {Lcevipedes) Cercopid^. 



