1972] 
Kukalova-Peck — Palaeozoic Insect Order $ 
253 
Body structures: Length of head 1.8 mm, width about 3*6 mm; 
preserved length of antennae 9 mm, antennae composed of numerous 
cylindrical segments; segments of maxillary palpi striated, preserved 
segment length 1.1 mm, width 0.8 mm; median line running along 
the whole body; prothorax length 4 mm, maximum width 8 mm, 
provided with two obliquely oriented longitudinal elevations and one 
elevation located anteriorly and centrally; mesothorax length 4.1 mm, 
probable width 8.8 mm; metathorax length 4.2 mm, maximum width 
probably 9.2 mm; legs covered by setae; front tibia length 38 mm; 
hind tibia length about 50 mm; abdomen length 14.5 mm, maximum 
width 9.4 mm; abdominal segments unequal, length of segments as 
follows: 1st 2 mm; 2nd 0.8 mm; 3rd 1.3 mm; 4th 1.7 mm; 5th 2 
mm; 6th 2 mm; 7th 0.5 mm; 8th 1 mm; 9th 1 mm; 10th 1.6 mm; 
nth 0.5 mm; each abdominal segment but the nth has a transverse 
flat topped ridge; nth segment divided by a deep incision into two 
lobes; ovipositor stout, reaching much beyond the end of the body, 
covered by dense stiff hairs oriented anteriorly. 
Projections: Two stout projections located in the central part of 
each body segment except the nth; prothorax with an additional pair 
of projections anteriorly and with about 8 projections along the pos- 
terior margin; mesothorax with a row of small projections parallel 
and near to the anterior margin and with double row of stouter 
projections on the posterior margin; metathorax with a series of stout 
projections on posterior margin; abdominal segments with, a row of 
stouter projections on the flat topped ridge and another row of 
smaller projections bordering the posterior margin; nth segment 
with only the posterior row of minute projections. 
Holotype: No. 1700/394, Paleoentomological Department, Paleon- 
tological Institute of the Academy of Sciences in Moscow. Collected 
in Lower Permian deposits of Tshekarda, Siberia. 
The preservation of the holotype is very good, particularly be- 
cause the veins of the wings have been secondarily penetrated and 
colored by manganese, which enters also the minute transverse cracks. 
The body is not fully flattened. The abdomen especially is preserved 
in its original convexity. Some of the bases of the projections are 
well preserved and only those are introduced in figure 1, marked 
as circles, as they actually appear. The projections were undoubtedly 
growing out from the tergites in regular rows, but since the surface 
of the body is uneven, they cannot be distinguished from the irregu- 
larities of the matrix. The actual length of the projections could not 
be followed as they continue inside the reverse of the fossil under an 
acute angle with the body. Their position, however, indicates that 
