AUSTRALIAN LEAF-HOPPERS. 
Part 7. 
STENOCOTIDAE. 
By J. W. Evans, M.A., F.R.E.S. 
(Text-figure 1.) 
The Stenocotidae comprise a family of leaf -hoppers that are confined to 
Australia. Although clearly related to the Lediadae, they differ from this family 
in several characters, of which the principal one concerns the venation of the tegmina. 
In the Stenocotidae the anal veins are invariably fused distally, so that a Y vein is 
^ formed, such as occurs in the Fulgoroidea. In some species, the second anal vein may 
terminate separately at the anal border, after junction with the first vein. The ocelli 
are variable in position and may be dorsal, marginal or ventral. Certain species have 
the frons separated into two areas, of which the anterior bears the impressions of the 
dilator muscles of the sucking-pump. As suggested elsewhere (Evans, 1936), these 
two areas probably represent the post-elypeus and the true frons. 
The male genitalia are characterised by the possession of narrow sub-genital 
plates, short parameres and broad pygophores. The pygophores have long narrow 
styles that arise from close to their ventral borders. These styles are analogous with 
those of species in the genus Eurymda Le P. and Serv., but not homologous, as with 
the Eur^Tuelinae the styles are processes of the sub-genital plates. The hind tibiae 
are also reminiscent of the Eurj^melinae, in so far as the joossession of a few large 
prominent spurs with apical spines is concerned. They differ in that the spurs are 
more flattened and in the possession of three rows of closely set spines. 
The sexual dimorphism in the genera Stenocotis Stal and Smicrocotis Kirk, is 
striking, the sexes not only differing from each other in size and colour pattern, but 
also in detailed structure. On this account it is probable that considerable synonymy 
exists, which at the moment it is impossible to correct. 
All the Stenocotidae are essentially arboreal insects, and are probably confined 
to Eucalyptus trees. Their peculiar flattened nymj^hs, which occTn under bark, are 
more frequently found than the adults. In coloration various shades of brown 
predominate, and some species have the tegmina of the males more or less transparent. 
