292 



lasternuni somewhat long, with two medium sized membranous 

 areas. Posterior coxae 'scarcely wider than the intermediate 

 pair, not reaching to the lateral margin of the thorax. 



Posterior femora towards the base on the upper surface with 

 a wider transverse keel. Empodium thicker, beneath with two 

 chitinous spinose strips, the free margin a little or scarcely 

 emarginate. Eyes always placed on the vertex towards the base. 

 Antennae always placed in deeper pits in front of the eyes un- 

 der the anterior margin of the vertex. Intermediate coxae with 

 a strong meracanthus. Posterior tibiate cylindrical, each with 

 a single process, or with two conical larger processes on the 

 outer surface 2. Cercopidac. 



■b. Elagellum always composed of numerous segments; basal 

 part longer, formed either of some (2-6) segments, or trans- 

 versely furcate furnished with some scattered sensory pits ; dis- 

 tal part divided into many segments, at least in part. Tegmina 

 beneath not carinate. Anterior margin of the wings without a 

 triaugular plate, sometimes somewhat convex. Metasternum 

 s'hort, entirely chitinous. Posterior coxae much wdder than the 

 intermediate pair, extending as far as to the lateral margin oi 

 the thorax. Posterior femora simple at the base. Empodium 

 thinner beneath, without apparent c'hitinous spines; free mar- 

 gin profoundly incised medianly. Ocelli sometimes on the ver- 

 tex, sometimes on the front, occasionally evanescent. Antennae 

 usually inserted in front of the eyes, sometimes under the eyes 

 Intermediate coxae somewhat rarely with a meracanthus. Pos- 

 terior tibiae very often prismatic or foliaceous, very rarely al- 

 most cylindrical, generally seriately spinulose, very rarely un- 

 armed 3. Jassidae. 



P). Second segment of the peduncle with many or very many 

 peculiar (composite) sensory organs; flagellum with a single 

 larger sensory organ on the pyriform basal segment, fnterme- 

 (iiate coxae with the intero-basal angles considerably or ver\- 

 distant inter se ; coxal abduction well developed. Metasternum 

 almost entirely membranous, and this thin cuticle is extended 

 outwards to the lateral parts of the inetatharox, w'hich is inflect- 

 ed somewhat on the lower side of the body. Posterior coxae 

 immobile, their exterior part coalesced with the metathorax; 

 irochantins absent. Trochanters very much stouter than the 

 [)osterior femora ; both an abduction and flexion possible be- 

 tween trochanter and femur. Posterior femora with a "yellow 

 spot" near the base on the upper surface. Pleura of the third 

 to eighth segments largely or altogether situated laterally, either 



