104 
Psyche 
[June 
its venation, to the European and American Protelytroptera (especial- 
ly to the family Protelytridae) than to other Australian groups. 
Nevertheless, in spite of the differences in venation of Protocoleidae, 
Permophilidae and Stenelytridae, there are some remarkable features 
in common, the complex of which differentiates the Australian forms 
from those of the Northern Hemisphere: flat tegmina of large size, 
covered by fine granulation, the very prominent and circular costal 
expansion, and the very broad subcostal area. 
Geological occurrence of family: Upper Permian of Australia 
(N.S.W.) 
Genera included: Stenelytron, new genus; Xenelytron , new genus. 
Genus Stenelytron, new genus 
Fore wing: tegminous, sutural margin long, not broad; costal 
expansion sub-circular, straight on the proximal side; setae forming 
a patch in the subcostal area; apex directed anteriorly; anterior mar- 
gin more or less convex; posterior margin slightly concave before the 
end of the anal area; Sc distinct, shortened, not reaching the anterior 
margin, approaching it in the basal third; subcostal area broad; R 
usually slightly convex, directed towards apex; Rs originating beyond 
middle of wing, usually simple and weak ; M of variable form, mostly 
simple; Cu usually divided into short CuA and slightly concave 
CuP; anal veins broad, strong, 3-5 in number, simple or forked. 
Relationship. Stenelytron , n. gen., differs from Xenelytron , n. gen., 
in the narrower sutural margin, free M (not in close proximity to 
CuP) and in the much smaller anal area, not reaching far beyond 
the middle of the wing. 
Stratigraphical occurrence: Upper Permian of Australia 
(N.S.W.) 
Type-species : Stenelytron enervatum, n. sp. 
Stenelytron enervatum, n. sp. 
Text-figure 9; plate 8 
Fore wing: about 14 mm. long and 3. 5-4. 4 mm. broad; sutural 
margin narrow; setae in the patch in the very proximal part of the 
subcostal area; apex directed slightly anteriorly; Sc relatively long, 
terminating beyond middle of wing; subcostal area broad; M free; 
the stem of Cu concave near the base; CuA separating from CuP 
late; anal area not large, with 3-4 mostly simple, strong veins. 
Holotype: No. In 45958 (reverse), In 45515 (obverse). Speci- 
mens No. In 45523, In 45508, In 45930, In 45704, In 45520, In 
