320 
Psyche 
[June 
at a point, or anastomosed as in Diaphanopteridae. Since the pres- 
ence or absence of the MA-Rs anastomosis is no longer useful as the 
family character, the status of the Elmoidae as a separate family is 
questionable. However, since Diaphanoptera, the type genus of the 
family, is from Upper Carboniferous strata, and since its body 
structure is entirely unknown, it Seems advisable to consider the 
families distinct at least until more is known about Diaphanoptera. 
The generic classification used here is based mainly upon the 
presence or absence of MA-Rs anastomosis, the general shape of the 
wings, and the character of the Rs area, since these features have 
been found relatively stable in the related order Palaeodictyoptera 
(Kukalova-Peck, 1971). All specimens available are figured. The 
lettering of the veins is shown in figures 9 and 10. 
Genus Elmodiapha, new genus 2 
Type species: Elmodiapha ovata n.sp., Lower Permian of Mora- 
via. 
Fore wing: MA and Rs not anastomosed, connected by a cross 
vein. Wings elongated, oval in shape. Sc terminating on R shortly 
beyond mid-wing. Rs area large, with about 6 branches. R sending 
off a series of long branches beyond the end of Sc. Hind wing not 
known. 
Elmodiapha differs from Parelmoa in having more elongate wings 
and richly branched Rs. From Pseudelmoa it differs in the shorter 
Sc, and in MA approaching more closely to Rs. 
Elmodiapha ovata n.sp. 
Figure 1, 2 
This species is represented by two detached fore wings with a 
richly branched Rs. 
Fore wing: length 1 7.5-21 mm, width 5. 4-6. 6 mm. Costa ser- 
rated. Rs with 6 long, densely arranged branches. MA simple, MP 
twice forked. CuA and CuP simple. iA usually with a series of 
branches, anal veins sometimes branched. 
Holotype: No. 1/1974 (fore wing fragment, length 18.5 mm, 
width 6.6 mm, obverse) ; specimen No. 2/1974 (fore wing fragment, 
length 16 mm, width 5.4 mm, obverse and reverse). Paleontological 
Institute of Charles University, Prague, Czechoslovakia. 
2 The latter part of this generic name (and that of the other genera which 
are proposed in this paper) is derived from the Greek adjective diaphanes 
(distinct) ; it is treated as a noun and is considered feminine 
