1971] Carpenter & Richardson — Pennsylvanian Insects 
277 
Figure 7. Homaloneura dabasinskasi Carpenter. Photograph of speci- 
men in Tidd collection. The arrow points to the cross-section of the beak. 
seem to have been unavoidable in the living insect. On the other 
hand, such an arrangement of the wings would seem to be very in- 
efficient mechanically. It is in this connection interesting to note 
that the only other palaeodictyopteron known that shows a similar 
overlapping of the fore and hind wings and a comparable, short 
thorax, is Stilbocrocis heeri, already mentioned. This condition of 
the wings is readily seen in the photograph of the specimen given by 
Guthorl (1934), as well as in the figures by Goldenberg (1854), 
Schlechtendal (1912) and Guthorl (1934); it is not shown in 
Handlirsch’s highly imaginative reconstruction of the insect (1920), 
in which the wings are represented in normal position. As noted 
above, Stilbocrocis has the wing venation characteristic of the Dic- 
tyoneuridae, whereas Notorachis has a very different vena.tional pat- 
tern, allying it to the Lycocercidae. 
