262 THE ENTOMOLOGIST. 



Posterior femora towards the base on the upper surface 

 with a wider transverse keel. Em.podiiim tJucker, beneath with 

 two chitinous spinose strips, tlie free margin a little or scarcely 

 emarginate. Eyes alwa3^s placed on the vertex towards the base. 

 Antenna? always jjlaced in deeper pits in front of the eyes under 

 the anterior margin of the vertex. Intermediate coxge with a 

 strong meracauthus. Posterior tibiae cylindrical, each with a 

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

 surface. ^ 2. Cercopidae. 



j3. Flagellum alivays composed of numerous segments ; basal 

 part longer, formed either of some {2-6) segments, or transversely 

 furcate, furnished loith some scattered sensory pits ; distal part 

 divided into many segments, at least in part. Tegmina beneath not 

 carinate. Anterior margin of the wings ivithout a triangular plate, 

 sometimes somewhat convex. Metastcrnum short, entirely chitinous. 

 Posterior coxce much ivider than the intermediate pair, extending 

 as far as to the lateral margin of the thorax. Posterior femora 

 simple at the base. Empodium thinner beneath, without apparent 

 chitinous sjnnes ,- free margin profoundly incised medianly. 

 Ocelli sometimes on the vertex, sometimes on the front, occa- 

 sionally evanescent. Antennae usually inserted in front of the 

 eyes, sometimes under the eyes. Intermediate coxse somewhat 

 rarely with a meracanthus. Posterior tibiae very often prismatic 

 or foliaceous, very rarely almost cylindrical, generally seriately 

 spinulose, very rarely unarmed. C 3. Jassidse. 



B. Second segment of the peduncle ivith many or very many 

 peculiar (composite) sensory organs ; flagellum ivith a single larger 

 sensory organ on the pyriform basal segment. Intermediate coxce. 

 with the intero-basal angles considerably or very distant inter se ; 

 coxal abduction well developed. Metasternum almost entirely mem- 

 branous, and this thin cuticle is extended outwards to the lateral 

 parts of the metathorax, ivhich is inflected someivhat on the loioer side 

 of the body. Posterior coxce immobile, their exterior part coalesced 

 with the metathorax ; trochantins absent. Trochanters very much 

 stouter than the posterior femora ; both an adduction and a flexion 

 possible between trochanter and femur. Posterior femora ivith a 

 ** yelloiv spot" near the base on the upper surface. Pleura of the 

 third to eighth segments largely or altogether situated laterally, 

 eitJier altogether membranous, or ivith a large upper area in large 

 part or altogether membranous, and a lower plate chitinous. First 

 pair of abdominal spiracles situated dorsally ivithin the exterior 

 produced part of the metanotum. Third to eighth ])airs situated 

 essentially laterally, and in large part or altogether turning out- 

 ivards. 



Ocelli more rarely evanescent, more often two at the sides of 

 the head in front of the antennae ; sometimes a third ocellus is 

 found on the lower margin of the front near the base of the 

 clypeus. Antennae inserted under the eyes ; flagellum composed 



