H 



1. Three stibcontiguous ocelli; sensory or.yans on the two 

 basal segments of antennal flagellnm verv numerous ; fore 

 femora incrassate : no arolia ; abdomen in the ma'es with a son- 

 orous apparatus on each side ; venation very characteristic, teg- 

 men tyjMcally with 5 "'discoidals" and 8 apical veins, wliich oc- 

 cupy its greater part i Cicadidac 



la Two ocelli, sometimes functionless ; only a few sensorv 

 organs on the basal segements of antennal flagellnm ; fore femora 

 rarely incrassate : arolia large (2) 



2 Antennal flagellum composed of a large sub]nriform basal 

 segment and a slender seta ; hind tibiae with one or two strong 

 spines 2 Cercojndae 



2a Antennal fiagellum composed of numerous sega";ents ; 

 hind tibiae unarmed ; or if spined, almost always with more than 

 2 strong s])ines ; usually seriatelv bristly (3) 



3 Genac more or less dilated ; pronotum never prolonged 

 backwards 3 Tetigoniidae 



3a Genae noi or scarcely dilated: pronotum prolonged back- 

 Avards in a process (except in a few forms of dubious ]:)Osition) 

 4 Alcmbracidae 



The ova arc usually, (perhaps always), in ah these families, 

 inserted in slits made in twigs or leaves. 



The families may be distinguished in the nymjilial stages (or 

 at least the ultimate) temporarily as follows: (there are never 

 any ocelli, nor are there special sensory organs on the antennae, 

 b.ead or abdomen, etc.) : 



T Frons with very numerous, closelx- set bristk-s in the mid- 

 dle : antennae with about 9 segments, decreasing in size from 

 tl'C l)asal one. Fore femora enormously incrassate, with one or 

 luore large spines beneath : fore tibiae raptorial, with spines or 

 large tubercles beneath : fore tarsi with 2 s gments, the first 

 annulifc.rm, arising at about two-thirds of the length of tlic tibia 

 and directed backwards, second segment long, slender, cylindric, 

 with 2 uneven claws. Fore coxae not shorter than femora. No 

 arolia. Middle and hind tarsi with 2 segments, first very short 

 1 Cicadidae 



la Frons not bristly. Fore femora rarely incrassate, not 

 spined beneath : fore tibiae not raptorial : fore tarsi bisegmentate. 

 of varying proportions, the basal segment arising from the apex of 

 the tibia : 2 subeven claws. Fore coxae shorter, generally very 



