402 
Psyche 
[December 
only one previous record from Pennsylvanian deposits of North 
America, although it is well represented in Upper Carboniferous 
beds of Europe. The third specimen belongs to the order Thysanura, 
which has not previously been reported from North American de- 
posits older than the Tertiary; since this specimen is very incom- 
pletely preserved, a formal description of it is not being presented 
at this time. The two remaining specimens are cockroaches, one 
consisting of a fore wing (tegmen) and the other of a whole insect 
except for the tegmina ; the latter specimen is discussed briefly below 
but neither of these blattarians is being formally described here. 
Order Palaeodictyoptera 
Family Lycocercidae 
As characterized by Kukalova (1969), the members of this family 
have MA and CuA unbranched, MP and CuP branched, and the 
cross veins fine, numerous and more or less irregular. The family 
has not previously been reported from any deposit in North America, 
although I have in my possession a representative of the family from 
the vicinity of Mazon Creek (Francis Creek Shales) in northern 
Illinois (Pennsylvanian Period). 
Genus Madera, new genus 2 
This genus contains species which are much smaller than those 
in Lycocercus ; the fore and hind wings are relatively broad, com- 
pared to those of Lycocercus ; MA in both pairs of wings arises at 
about the level of the origin of Rs, and CuP consists of two long 
branches, without marginal forks. 
Type species: Madera mamayi new species. 
I have placed this genus in the Lycocercidae mainly on the basis 
of the unbranched MA and CuA, a feature which seems to be con- 
sistent and reliable, as pointed out by Kukalova (1969). This single 
condition of MA and CuA actually occurs in several families but 
all of them except Lycocercidae possess peculiar characteristics absent 
in Madera. My first thought on examining this new species of 
Madera was that it was related to the genus Eubleptus , which con- 
tains species of about the same size. However, with the presence 
in Eubleptus of a branched MA and a forked CuP, the Eublep- 
tidae are clearly members of that complex of Palaeodictyoptera 
in which these two veins are branched. In shape, the wings of Madera 
2 The name of the genus is derived from that of the village of La Madera, 
New Mexico, and is considered feminine. 
