3i8 
Psyche 
[December 
Protereisma sp. (nymph no. 3) 
This was also collected in the Permian of Obora, Moravia, Czecho- 
slovakia and is contained in the collection of Charles University, 
Prague. It consists of a part of the thorax, including the wing pads. 
Prothorax relatively long and large being about as long as the meso- 
thorax; anterior margin slightly concave; the side margins nearly 
parallel; the margined area is very distinct. Mesothorax about 1.2 
times as long as the metathorax. Wing pads independent and diver- 
gent, as in nymph no. 1 ; venation very similar to that in the pre- 
viously described nymphs; in both wings Rs arises distinctly from 
R but in the hind wing it appears to be connected to M near the wing 
base by a cross vein. Dimensions: length of prothorax, 2.5 mm; 
length of fore wing, 5.2 mm; length of hind wing, 5.0 mm. 
Protereisma sp. (nymph no. 4) 
This specimen is from the Lower Permian of Obora, Moravia, 
and is in the collection of Charles University. Prothorax much as 
in nymph no. 2 above but mesothorax seems relatively shorter; meso- 
and metanota as in the previous nymphs; legs with long femora. 
Wing pads similar in position and shape to those of the previous 
nymphs but venation very weakly indicated ; the small size of these 
wing pads relative to the size of the thoracic segments shows that 
this is a much younger stage than that of nymph no. 2. Abdomen 
with segments 1 and 2 somewhat narrower than the subsequent seg- 
ments; markings on terga a little different from those of nymph no. 1, 
as indicated in the figure; cerci and caudal filament with somewhat 
shorter hairs than in previous specimens; tracheal gills present on 
segments 2-9, not preserved on the first segment; those of the 9th 
segment very small. Dimensions: length of preserved part of body, 
15.5 mm; length of left fore wing about 2.5 mm. 
Protereisma sp. (nymph no. 5) 
Lower Permian of Obora, Moravia. Prothorax as in the previous 
specimens but with the posterior border somewhat more rounded ; 
otherwise as in nymph no. 2. Mesothorax broader and longer than 
the metathorax, both segments marked as in nymph no. 2. The legs 
are unknown. Wing pads as in previous nymphs 2 and abdomen of 
usual form; cerci and caudal filament showing no hairs (probably 
due to a lack of preservation) . Gills present on the first nine segments, 
2 The difference between the shape of the wings on the left and right side 
of the specimen is due to the unidirectional stress which subsequently affected 
the matrix clay. 
