13 
Phasgonurinæ and Decticinœ , although a reference to any of these 
latter cannot be proved. 
Though we are obliged to leave the question about subfamily 
undecided, our wing, however, displays features so characteristic both 
in comparison Xvith the recent and with the few Tertiary forms that 
I think it justifiable to establish it as a new genus and species to 
which I give the name of 
Nymphomorpha n. g. medialis n. sp. 
As it is impossible by means of this one specimen to decide 
which of its characters belong to the genus and which to the spe¬ 
cies, I shall state them all together; it is most probable that by far 
the greater part (and perhaps all of them) are generic characters. 
R is forked at the very apex. 
It is distinctly seen that the distal half of the vein next to R is 
an Rs, as its inner part (at the offspring from R) is stronger and 
more oblique than the cross-veins, between which it is situated. 
Rasad the line formed by Rs is continued by Mi+s, but whilst this 
latter vein in the recent forms distally bends caudad even basally to 
the middle of the wing, backwards and outwards converging with 
the Rs branches (Si S 2 S3), in order to join the longitudinal vein 
formed by M 2 together with the lower parts of Si and Sa, this back¬ 
wards curve of Mi in our form takes place more distally on the wing 
membrane (we may estimate it to be at about V 3 of the wing length, 
counted from base). This distal part of Mi is very short, not much 
longer than the other cross-veins proper between M1+2 and M3+4, 
whereas in the recent forms it is much longer than the corresponding 
parts of Si. 
That the backwards bending part of Mi+a really is represented 
by the cross-vein-like part, which I have indicated with these letters, 
and not by any of the similar cross-veins basad to it, is proved 
by the (presence of the very distinct radiomedial cross-vein (r-m). 
