250 
Psyche 
[September 
Plate 1 
Sylvohymen sibiricus n.sp., obverse. The arrows point to the bases of the 
projections on the tergites. Lower Permian, Siberia. 
is based on literature only) and further study of the original mate- 
rial might find the two genera synonymous. 
Martyonv’s reconstruction of Sylvohymen rohustsus (1941) show- 
ing MA anastomosing with Rs is obviously incorrect, as the connec- 
tion of MA with R or Rs by means of a cross vein is characteristic 
for Bardohymenidae. 
Wings long and slender, tapered rather abruptly in the basal third ; 
hind wings slightly longer than fore wings, broader at about mid- 
wing; Sc recognizable only in proximal half of the wing; Rs with 
3 main branches ; Ai S-shaped; posterior margin in untapered part of 
wing almost parallel to the anterior margin. 
Body structures: Prothorax with transverse elevations; metathorax 
broader than mesothorax; first abdominal segment strongly tapering; 
