1941] 
Jassoid Genera 
117 
Bythoscopus and Penthimia, illustrated in Figures 2, c and 
4, b respectively, will show that the genera resemble each 
other in essential head structure. The occurrence of the 
hindmost part of the fronto-clypeus on the crown in Pen- 
thimia is a purely secondary feature brought about by the 
production and inflation of the fronto-clypeus. The Thau- 
matoscopini are a tribe comprising Australian genera that 
show complete gradation between species with ventral 
ocelli and rounded heads, and others with dorsal ocelli and 
spatulate heads. 
Figure 4. a-c, Penthimia aw.ericana; d, e, Spanbergiella vulnerata; 
f, g, Parablocratus glauscens ; h, i, Thamnotettix cocker elli. 
Euscelidae 
This family, which comprises genera related to Euscelis, 
such as Thamnotettix Zett., Eutettix Van D. and Delto- 
cephalus Burm., though distinct from the Bythoscopidae, is 
probably an offshoot from it. It is almost certain that 
Hecalus, Parablocratus and Spanbergiella are nearer to 
Bythoscopus than to Euscelis. For the purpose of com- 
parison, figures are given of Thamnotettix cockerelli Ball. 
(Fig. 4, h, i). 
Agalliidae 
Agallia does not closely resemble Bythoscopus in shape, 
size, or coloration, nor in a single character of any signifi- 
cance ; neither do any of the numerous genera usually asso- 
