3i6 
Psyche 
[December 
Fig. 2. Protereisma sp. (nymph no. 1), Lower Permian of Oklahoma. 
Original drawing. Left fore and hind wing. 
Protereisma sp. (nymph no. 2) 
seem to be the same as in the previous nymph. The insects could 
well be conspecific with the previous specimen. 
This was collected in the Lower Permian of Obora, Moravia., in 
Czechoslovakia by Charles Havlata and is contained in the collection 
of Charles University in Prague. It is almost certainly a cast 
cuticle. Head not preserved ; prothorax as broad as the metathorax 
or nearly so, its anterior margin straight, its anterior, lateral and 
posterior margins forming a smoothly convex border; otherwise as 
in nymph no. 1. Mesothorax about one and a half times as long as 
the metathorax; both nota. as in the previous nymph. Wing pads 
essentially as in nymph no. 1 , but even more divergent ; wing venation 
also the same. Abdomen narrowing abruptly behind the sixth seg- 
ment; first segment much shorter than segments two and three. 
Caudal filament and cerci of about the same length, reaching almost 
to about half the length of the abdomen. Tracheal gills are present 
on segments 2-9 (not preserved on first segment) ; gills apparently 
subequal and elongate oval in shape, but those on segments eight and 
nine are more narrow and lanceolate; gills with faint longitudinal 
lines, which are sometimes forked. Dimensions: length of the pre- 
served part of body, 16.5 mm; length of left forewing 5.2 mm; 
length of left cercus, 5.7 mm. 
