22 
Psyche 
[March 
condition and not an original, primitive one. On the other hand, 
the almost symmetrical radiation of the veins in the lobes seems to 
indicate what was probably the original distribution of venation, 
before the veins were arranged more nearly longitudinally especially 
to support the anterior margin of the wing in connection with flight. 
In figure 63 I have attempted to identify the pronotal veins 
of pygmaea. Although Sc seems to be obvious by its position and its 
pectinate series of branches and Cu by its position and sigmoidal 
course, the designation of the other veins is purely arbitrary. 
One of the surprising features of the prothoracic lobes is the 
extent to which they overlap the forewings. But in all probability 
the lobes were high on the prothorax, which was presumably rounded 
above, so that there was probably enough space for the movement 
of the fore wings without there being any interference by the lobes. 
At the same time, the lobes, which were attached along a very 
narrow ridge^ were probably capable of being moved by the action 
of the fore wings or perhaps by air currents. 
In the collections of the Institut there are several fragments of 
Palaeodictyoptera labeled by Meunier as Stenodictya pygmaea. 
These are so incomplete that they can only be referred to Dictyo- 
neuridae inc. gen. The following account is based on the type 
specimen of pygmaea only. Fore and hind wings of the typical 
Stenodictya character. Body structures: prothoracic lobe, 15 mm 
long, 14 mm wide. Anterior and posterior margins strengthened 
near the base; the apex pointed, directed somewhat anteriorly. 
Veins of lobe radiating independently from a basal, cuticular ridge. 
Sc apparently sending out a pectinate series of 4 branches; “R” 
and “Rs” simple; “MA” forked, directed above apex, “MP” simple, 
curved ; Cu sigmoidal, dividing into “CuA” and “CuP”, both of 
these being forked. One “anal” vein. Cross veins numerous, 
irregular, anastomosed. Prothoracic lobe sclerotized, covered by 
numerous deep pits. 
Stenodictya grandissima Meunier 
Figure 63 
Stenodictya grandissima Meunier, 1911: 121, fig. 4; Meunier, 1912: 11, 
pi. 7, fig. 5; Handlirsch, 1919: 3. fig. 1. 
Microdictya grandissima, Lameere, 1917: 159. 
This species was based by Meunier on the largest wing so far 
known within the Dictyoneuridae. Lameere (1917, p. 159) be- 
lieved that, because of the branched MP, this species should be 
referred to the genus Microdictya Brongniart, close to “Microdictya” 
