1941] 
Jassoid Genera 
115 
such a condition is found in all adult leaf-hoppers. The 
sclerite made up in part of the frons and in part of the post- 
clypeus, will be referred to as the fronto-clypeus. It may be 
entirely central in position or extend onto the crown, and 
may, or may not, be directly continuous with the vertex. The 
morphology of the head of Homoptera has been fully dis- 
cussed in three recent publications (Spooner, 1938; Evans, 
1938; Snodgrass, 1938.) 
Figure 2. a, b, e, Eurinoscopus punctatus; c, d, g, Bythoscopus 
lanio ; f, Eurinoscopus sp., male genitalia; fr., fronto-clypeus. 
Bythoscopidae 
The principal features of the external structure of Bytho- 
scopus lanio (L.) and Eurinoscopus spp. are shown in 
Figure 2. Eurinoscopus Kirk, is an Australian genus which 
according to Oman (1936) is synonymous with Bythoscopus. 
In Figure 3 the corresponding parts of Reuteriella flavescens 
Sign, are illustrated. This is an Australian leaf-hopper, 
which, because of the marginal position of the ocelli, would 
presumably be placed in the Jassinae by most Hemipterists. 
It is unnecessary to do more than draw attention to the very 
close similarity between the two groups of illustrations. 
The differences are, that in Bythoscopus , a frontal and an 
epicranial, but not a coronal, suture are retained, the reverse 
being the case with Reuteriella. The ocelli in the two genera 
are in identical positions, as is shown by a comparison of 
Fig. 2, d with Fig. 3, e, except that the backward extension 
of the muscles of the sucking-pump and the accompanying 
