10 N. C. AGR. EXP. STA. BUL. 239 
diagram could well be placed on another page, with another group. Such 
possibilities are suggested by framing a generic name in a broken line. This 
generic name will appear again in another diagram and suggest relationships 
between the groups of the respective diagrams. This graphic representation may 
have little relationship to phylogeny; it is a reflection of similarity in general ap- 
pearance and in morphology of both males and females, as far as possible. It will 
be useful, hopefully, in enabling a reader to try alternatives in placing trouble- 
some species which don’t quite fit a given generic description or the associated 
illustrations. 
The Cicadellini are an intricate group. Their morphology suggests rapid 
radiation and often shows small discontinuities compared with those found in 
many of the Proconiini. Ecological information is far too meagre, at present, to 
be useful to support or refute the associations of genera used here, and much 
testing and probably no inconsiderable changing of ideas concerning generic re- 
lationships are anticipated. The genera themselves, on the other hand, will 
probably be relatively more stable, except for the addition of numerous new 
species from the Neotropical region which is still not well known. 
