312 
Psyche 
[December 
fully below. Consequently, the nine specimens of Dunharia fasciipen- 
nis do not provide conclusive information about sexual dimorphism. 
Mention should also be made of Tillyard’s reference to the pres- 
ence of a “short appendix dorsalis similar to those of some Recent 
Plectoptera” (1925, p. 335, fig. 3). This structure turns out to be a 
narrow piece of matrix, accidentally included between the cerci of 
specimen no. 1002. 
New Observations on the Structure of Dunbaria 
Wings: In Palaeodictyoptera with a very delicate wing mem- 
brane, additional supporting structures often occur, these being con- 
centrated in the basal third of the wing and along the anterior margin, 
much as in the wings of the Odonata (Kukalova, 1969-1970, Pt. I- 
III). In the wings of Dunbaria , of which the variation will be 
discussed later, there are several elements that strengthen the mem- 
brane : a series of strong cross veins connect the anal stem to the 
origin of Rs, supporting the basal third of the wings; the anal stem 
is unusually wide, flattened and heavily sclerotized ; the proximal 
part of Ai is provided with a conspicuous, convex cuticular thicken- 
ing, apparently also sclerotized ; the postcostal area is not flat as in 
most other Palaeodictyoptera, but forms a triangular, concave fold 
with 1-3 twigs; the precostal strip in both fore and hind wings is 
serrated, recalling the condition in the Odonata (Tillyard, 1924, 
p. 206) (see fig. 2 A-C) ; the costa is very strong, broadened and 
band-like in appearance to beyond the middle of the wings, and is 
provided also by a serrated anterior margin (Fig. 2 A-C). The en- 
tire apical and posterior margins are dentate. 
The prothoracic paranota are heavily sclerotized, cordate, and cov- 
ered by dense, short hairs; they do not overlap the fore-wings. 
Radiating veins are only vaguely indicated in the lobes; the margin 
is bordered by a thickened ridge. The sclerotization of the paranota 
is known to be correlated with the reduction of veins in the spilap- 
terid Homaloneura , which is closely related to Dunbaria. The 
presence of the thickened ridge has already been observed in Eublep- 
tus (Carpenter, 1965, p. 181, fig. 3) of the closely related family 
Eubleptidae. 
Body Structures: The head is small, eyes prominent; antennae 
thin, multisegmented, composed of long segments which are slightly 
broadened distally (fig. 15); thoracic segments almost equal; meso- 
thorax slightly broader than the prothorax and narrower than the 
metathorax; abdomen relatively slender, composed of 11 visible seg- 
