86 
Psyche 
[March 
Fig. 4. Stages in the development of the fore wing in Moravia convergens showing 
changes in the longitudinal axis. A, Very young nymph; B, subimago; C, adult. 
Lower Permian of Czechoslovakia. Original. 
whether or not the concave veins were symmetrically as broad on 
the lower wing surface. It should be noted that the venation of the 
adult wings does not show any sign of the presence of vein-blood 
sinuses. 
