1966] 
Kukalova — Protelytroptera 
105 
45505, In 45516, In 45512, are also this species. British Museum 
(N.H.), London. Collected in Upper Permian, Belmont, N.S.W. 
Genus Xenelytron, new genus 
Fore wing: tegminous, almost flat; sutural margin broad; costal 
expansion large, subcircular, straight on the proximal side; apex on 
about the axis of wing; anterior margin little convex; Ri directed 
towards apex; Rs originating late, weak; M usually in close proxi- 
mity to Cu, simple or forked; Cu long, terminating far behind the 
middle of the wing; anal veins broad, strong, 3-5 in number, simple 
or forked. 
Relationship. Xenelytron , n. gen., differs from Stenelytron, n. gen., 
in its broader sutural margin, the close proximity of M to CuP, and 
in the large anal area, terminating far beyond the middle of the wing. 
Stratigraphic occurrence: Upper Permian of N.S.W., Australia. 
Type-species: X enelytron ligula n. sp. 
Xenelytron ligula, n. sp. 
Text-figure 10 
Fore wing: 10.1-11.5 mm. long and 3-3.8 mm. broad; sutural 
margin broad excepting the proximal part; anterior margin 
strengthened; M in close proximity to CuP, detaching from it at 
about the middle of the wing. 
Holotype: No. In 45526 (obverse). Specimen No. In 38113 is 
perhaps the same species. British Museum (N.H.), London. Col- 
lected in Upper Permian, Belmont, N.S.W. 
Dermelytridae, new family 
Diagnosis. Fore wing: small, convex, but weakly sclerotized, with 
dark pigmentation ; sutural margin well developed ; wing surface 
rugose; setae forming patches; costal expansion projecting only a 
little; veins much reduced, missing or partially indicated at the base. 
Relationship. Among the Protelytroptera there are three families, 
the venation of which is very reduced : Blattelytridae Tillyard, Per- 
mophilidae Tillyard and Dermelytridae, n. fam. I am convinced that 
they represent three separate lines of evolution, with no closer phylo- 
genetic relationships. As pointed out already by Carpenter (1938) 
in the Blattelytridae the fore wings are very convex and sclerotized, 
the whole venational pattern is obsolescent, but completely represented 
and much similar to that of Protelytridae. In the Permophilidae, the 
