268 
Psyche 
[December 
The Herdina specimen is a nymph with its wing pads held ob- 
liquely away from the body (figure i ). In this respect the wing pads 
resemble those of the megasecopterous nymph, Mis chapter a doug- 
lassi , described from the same formation a few years ago (Carpenter 
and Richardson, 1968). However, the venation in the present 
nymph is sufficiently well indicated in one of the wing pads to show 
that the insect is a member of the Palaeodictyoptera and that it prob- 
ably belongs to the family Lycocercidae. This is of unusual signifi- 
cance, since all of the nymphs which have previously been assigned 
to the Palaeodictyoptera actually belong elsewhere or have very du- 
bious palaeodictyopterous affinities. Although until recently the 
family Lycocercidae has been known only from the Upper Car- 
boniferous of Europe, it has lately been found in Pennsylvanian de- 
posits of New Mexico (Carpenter, 1971). 
Genus Lycodemas, new genus 5 
It seems advisable to refer this nymphal form to a separate genus 
rather than to assign it to one of the three genera of the family al- 
ready recognized (Kukalova, 1969) ; the venation of the nymphal 
wing is not fully developed and does not provide a satisfactory con- 
cept of the adult venational pattern for comparison with the other 
known lycocercid species. Since the posterior media (MP) is much 
less developed in the nymph than it is in the known adults of Lyco- 
cercus and the related genus Apopappus, we consider that this (i.e., 
the less developed MP) should be the diagnostic feature of the genus 
Lycodemas. The more obvious peculiarities of the nymphal wing, 
such as the narrow proximal region, are aspects of the immature 
state of its development. 
Type species: Lycodemas adolescens, n. sp. 
Lycodemas adolescens, n.sp. 
Figures 1-3 
Length of fore wing pad, 11 mm.; width, 3 mm.; length of body 
from front of mesothorax to end of abdomen (as preserved), 26 
mm. ; width of first abdominal segment, 6 mm. The venation, as 
faintly indicated in a fore wing pad, is represented in figure 2. The 
wing sheath (w) is conspicuous around the wing except in the ap- 
ical region, where it is narrow. The subcosta (SC), which extends 
nearly to the apex of the wing, has a series of blunt projections or 
tubercles near the middle of the wing; these may possibly have been 
setal bases in the living insect. The precise origin of Rs from R is 
5 The generic name is derived from a combination of lykos (wolf) and 
demas (body) and is considered neuter. 
