1941] 
Jassoid Genera 
113 
THE INTER-RELATIONSHIPS OF CERTAIN 
JASSOID GENERA (JASSOIDEA, HOMOPTERA) 
By J. W. Evans 
Department of Agriculture, Hobart, Tasmania 
As a result of a study of Australian leaf -hoppers which 
has extended over several years, certain conclusions have 
been reached concerning the classification of this group of 
insects that disagree with the generally accepted ideas on 
the subject. These conclusions have already been published 
(Evans, 1939). The purpose of the present paper is to 
draw attention to the new proposed classification in so far 
as it affects certain genera represented in the North Ameri- 
can fauna. It is not intended to repeat the arguments on 
which the new system is based, nor to give lengthy diag- 
noses of characters. Instead, recourse is made to brief 
comparisons supported by illustrations. These it is hoped 
will suffice to stimulate interest in the new proposals, and 
help to pave the way to a system based more on genetic 
affinity than on superficial characteristics. 
The genera concerned are, Bythoscopinae : Bythoscopus 
Germ., Agallia Curtis, Idiocerus Lewis, Macropsis Lewis, 
Oncopsis Burm., Neopsis Oman ; Gyponinae : Gypona Germ., 
Penthimia Germ., Xerophloea Germ.; Jassinae: Jassus 
Fabr., Euscelis Brulle, Dorycephalus Kirsch., Hecalus Stal, 
Spanbergiella Sign., Parablocratus Fieb., Nionia Ball; 
Koebelinae: Koebelia Baker. 
Following Baker (1923), it has been found convenient to 
regard each of the more distinct groups of leaf-hoppers as a 
family unit, and the re-arrangement of the above genera into 
families on the basis of my system results in the following 
groupings : 
f Gyponinae 
j 
Bythoscopidae ] Bythoscopinae 
f Hecalini — Hecalus, Parablocratus, 
] Spanbergiella 
{ Gyponini — Gypona 
Bythoscopus 
f Penthimiini — Penthimia 
Penthimiinae ] 
[ (Thaumatoscopini*) 
*Not represented in North America. 
