184 
Psyche 
[December 
This is the only family of which the hind wing and body structure 
have been known. These have already been described (Carpenter, 
19 33) but the reconstructed figure of the whole insects, including 
only those details which are actually known, is included here for 
comparison with other families (Text-figure 2). 
Family Archelytridae Carpenter 
Archelytridae Carpenter, 1933, Proc. Amer. Acad. Arts Sci. 68:477. 
This family is still known only by the type specimen of Arche- 
lytron superbum Carpenter, from the Elmo deposit. However, new 
specimens of related Protelytroptera from Moravia require a modi- 
fication of our concept of this family and of the actual structure of 
the elytron. At the time of the description of Archelytron , no 
Protelytroptera were known which had cross veins on the elytra. 
In the original account of A. superbum , it was stated that cross veins 
were absent but that the surface of the elytron was rough and under 
oblique light appeared to have a series of short ridges between the 
veins over the entire elytron. Since the elytra of several new genera 
from the Permian of Moravia have numerous and distinct cross 
veins, we are convinced that the supposed ridges in Archelytron are 
also cross veins. Revised definitions of the family Archelytridae and 
the genus Archelytron now seem necessary. 
The family Archelytridae appears to have the following character- 
istics: elytron only slightly convex; costal expansion weakly devel- 
oped; stems of main veins independent; Sc long, well developed, 
terminating on costa about two-thirds wing length from the base; 
Sc 
Text-figure 1. Drawing of elytron of Archelytron superbum Carpenter 
(holotype) . Original, ce, costal expansion; Sc, subcosta; Rl radius; Rs, 
radial sector; M, media; CuA, anterior cubitus; CuP, posterior cubitus; 
1A, first anal vein; sm, sutural margin. 
