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ter se ; coxal a1)diiction somewhat small. Metasternum either en- 

 tirely chitinous, or with two median sized membranous areas. 

 Posterior coxae mobile, trochantins apparent ; posterior tro- 

 chanters a little or not wider than the femora ; a flexion only pos- 

 sible between trochanter and femur ; posterior femora without 

 a "yellow spot" on the upper surface. Pleura of third to eighth 

 abdominal segments entirely located on the lower side, formed 

 of a larger exterior chitinous plate, and of an interior narrower 

 area, partly membranous or evanescent. First pair of abdominal 

 sjiiracles placed either laterally or ventrally. Third to eighth pairs 

 placed ventrally, looking downwards. Tegulae always absent. 



a. Three ocelli. 



FlagelLum consisting of five (or four ?) elongate segments ; 

 sensory foveae very numerous in the two basal segments of the 

 flagellum (some even found in the other segments. Conspicuous 

 part of the mesonotum very large. Anterior femora very dififer- 

 ent from the intermediate pair (always considerably incrassate.) 

 No empodium. Second pair of abdominal spiracles placed in 

 a transverse ventral furrow, looking anteriorly and medianly ; 

 third to seventh pairs placed in the sternites, not in the pleura, 

 Stridular organ present in the male. Antennae always placed 

 in deep pits in front of the eyes under the anterior margin of 

 the vertex. Tegmina unarmed beneath. Anterior margin of 

 the wings a little curved towards the base, unarmed. Metas- 

 ternum entirely chitinous. Posterior scarcely wider than the in- 

 termediate coxae, never reaching to the lateral margin of the 

 thorax. Posterior femora simple, posterior tibiae cylindrical. . 



I. Stridulantia (i. e. Cicadidae). 



b. Ocelli two or none. Flagellum composed of either nu 

 merous segments, or of an inflated basal segment and a very 

 slender "seta"; some sensory foveae present, never numerous. 

 Conspicuous part of the mesonotum median-sized, or small or 

 absent. Anterior femora scarcely different from the second pair 

 (most often not incrassate.) A large empodium present. 

 Secoi;d pair of abdominal spiracles placed laterally, looking ex- 

 teriorly or partly upwards. Third to eighth pairs placed in the 

 pleura. No stridular organ. 



a. Flagellum composed of a large subpyriform basal seg- 

 ment, and a very slender "seta" — generally aubarticulate ; basal 

 segment with some sensory organs, "seta" without them. Teg- 

 mina with a carina towards the base on the lower surface. An 

 terior margin of wings towards the base with a triangular plate, 

 which is furnished on the exterior margin with some hooks. Me- 



