1972 ] 
Kukalova-Peck — Palaeozoic Insect Order $ 
251 
ovipositor in females stout, covered by hairs; projections probably 
maximally 14 in number in a row. 
As shown previously by Martynov (1941) and Carpenter (1947, 
p. 32), Sylvohymen is closely related to the type genus Bardohymen. 
The reconstruction of Bardohymen magnipennifer (G. Zalessky 1937, 
p. 603, fig. 1 ) is obviously incorrect for its cubital branches. By the 
structure of pterostigmal area the genus Sylvohymen is related to 
Alexahymen n.g., which differs in having a relatively shorter and 
broader wing with concave posterior margin, small rs area and Ai 
parallel with posterior margin. 
Species included: Sylvohymen robustus Martynov, 1938 (Lower 
Permian, Oklahoma) ; Sylvohymen sibiricus n.sp. (Lower Permian, 
Tshekarda, Siberia). 
Sylvohymen sibiricus n.sp. 1 
Figure 1, plates 1 and 2 
This species is based upon an obverse and reverse of a. female with 
two complete wings and damaged lateral part of body. The thorax 
and the abdomen are preserved on the dorsal side, while the head pre- 
sents a composite of dorsal and ventral surface showing bases of stout 
palpi. The projections, if only the obverse were known, give the 
appearance of stout tubercles. In the reverse, however, they con- 
tinue like hollow tubes into the matrix. 
For preparing the illustration, both obverse and reverse parts of 
the specimen were used. 
Wings slightly subequal, the hind pair being longer and broader at 
about mid wing; color markings missing; fore wing length 50 mm, 
maximum width 9.1 mm, almost equally broad except for the tapered 
proximal third; anterior margin slightly convex; C bordering the 
whole wing; apex bent backward and almost pointed; Ri apically 
diverging to some extent, with 1-3 terminal twigs; Rs with 3 simple 
long branches; Ai S-shaped with a row of about 9 branches; cross 
veins about 18 in number; cross vein between Ri and Rs forming 
a heavy bar, thickened at its costal end; hind wing length 51 mm, 
maximum width 9.7 mm, broadest at the mid-wing; hind wing nar- 
rowing proximally less abruptly ; anterior margin somewhat straighter ; 
Ri apically less diverged away from the anterior margin, with only 
1 twig. 
This remarkable specimen was turned over to me for study by the 
courtesy of Dr. B. B. Rohdendorf, the head of the Paleoentomological De- 
partment of the Paleontological Institute of the Academy of Sciences in 
Moscow, for which I express my sincere gratitude. 
