STUDIES IN AUSTRALIAN LEP1D0PTERA. 
85 
a. Hindwings with 7 connected by a long bar with 8, precostal 
cell very large ... ... ... ... ... ... Perna. 
cut. Hindwings with 7 anastomosing with 8 soon after origin, 
precostal cell small. 
b. Hindwings with two costal veinlets, or with basal veinlet 
obsolete, leaving one from beyond middle of precostal 
cell. 
c. Palpi long, over 4. 
d. Forewdngs with 6, 7, 8 stalked. 
e. Hindwings with 3, 4, 5 stalked ... Digglesia. 
ee. Hindwings with 3, 4, 5 all separate ... Rhath.ymod.es. 
dd. Forewings with 8 separate. 
e. Hindwings with 4 and 5 stalked Entometa. 
ee. Hindwings with 4 and 5 separate Opsirhina. 
cc. Palpi moderate, not exceeding 3. 
d. Hindwings with 4 and 5 stalked Symphyta. 
dd. Hindwings with 4 and 5 separate Porela. 
bb. Hindwings with one strong costal veinlet from base of 
precostal cell. 
c. Palpi short, not reaching beyond frontal tuft. 
d. Hindwings with 4 and 5 connate or separate. 
e. Forewings with 6, 7, 8 stalked Pinara. 
ee. Forewings with 8 separate ... ... ... ... Crexa. 
dd. Hindwings with 4 and 5 stalked Cyclophragma 
cc. Palpi moderately long, reaching well beyond frontal 
tuft Aspiducha. 
The probable affinities of these eleven genera are indicated by 
the following diagram : — 
Digglesia 
Entometa Rhathymodes 
I I 
I . 
Opsirhina Symphyta 
Perna Porela 
1 
Crexa 
1 
Cyclophragma 
1 1 
Aspic 
ucha. 
Qen. PERNA. 
Perna, Wlk., Cat. Brit. Mus. v, 
p. 1127. 
Palpi moderately short. Pore wings with 6 and 7 stalked, 9 and 
10 stalked. Hindwings with 4 and 5 separate. 
Type Bombyx exposita, Lew. 
A development of Aspiducha, the anastomosis between 7 and 8 
of hindwings being displaced distally and drawn out into a long bar. 
