124 
Psyche 
[September 
this species and the more basal area cannot be considered as a 
precostal area, as it occurs in the Orthoptera or Protodonata. Since 
similar ridges or actual veinlets have been observed (Kukalova, i960) 
in other Palaeodictyoptera (Breyeria and Ostrava) , they may turn out 
to be characteristic of most Palaeodictyoptera. Another interesting 
structure present in dabasinskasi is the thickened basal stem of R. 
Examined under certain angles of illumination, the posterior edge 
of this stem appears as an independent vein extending almost from 
the base of M to the origin of Rs. Careful examination of the base 
of the wing, under various types of illumination, however, has con- 
vinced me that this apparent vein is actually the posterior edge of 
the stem of R. Similar widening of R can be seen in the Commentry 
specimens of Homaloneura. 
To enable further comparisons of dabasinskasi with the described 
species of Homaloneura , I am including here (plates 17 and 18) 
photographs of the types of H. elegans Brongniart and of H. bon- 
nieri Brongniart, which are contained in the Laboratoire de 
Paleontologie of the Museum National d’Histoire Naturelle, Paris. 
It is regrettable that the Illinois fossil does not show such body 
structures as the prothoracic lobes, which are visible in both of the 
Commentry fossils depicted. 
References 
Brongniart, C. 
1885. Les insectes fossiles des terrains primaires. Bull. Societe Amis 
des Sciences Naturelles de Rouen, 1885: 50-68. 
1893. Recherches pour servir a 1’histoire des insectes fossiles des temps 
primaires. Saint-Etienne, pp. 1-493. 
Handlirsch, A. 
1906. Die fossilen Insekten, Leipzig, p. 108. 
1922. Fossilium Catalogus, (1) 16: 47. 
Kukalova, J. 
1960. New Palaeodictyoptera (Insecta) of the Carboniferous and 
Permian of Czechoslovakia. Sbornik UUG, paleon. 25:239-250. 
Rohdendorf, B. B. 
1961. Palaeozoic insects of the Kuznetsk Basin. Trudy Paleont. Inst., 
85 : 72. 
Zalessky, G. 
1946. Sur un representant d’un nouveau ordre des Hemiodonates de 
Perimien de 1’Oural. Bull. Soc. Nat. Moscou, 51 : 63-70. 
