46 Psyche [Mar - 
sibly a wing-pad; but there is nothing to show its af- 
finities. 
From the foregoing account I believe it is clear that 
none of the fossils described as palaeodictyopterous 
nymphs can rightly be so considered until further evi- 
dence is at hand. Consequently, we have no actual 
record of the nymphs of these insects and no knowledge 
whatever of their wing development. It is noteworthy; 
in this connection, that nymphs of the related order 
Megasecoptera have been described by Handlirsch 
(1911), from Illinois, and Bolton (1921) from England. 
Those studied by Bolton show a venational pattern 
strongly resembling that of the adult insects of the 
family Brodiidae, and since both adults and nymphs 
occur in the same deposit, their association seems justi- 
fied. Handlirsch ’s ( Palceodictyopteron ) anglicanum, 
which has been discussed above, may be a poorly pre- 
served and distorted specimen of this type. His me- 
gasecopterous nymph, from the vicinity of Mazon Creek, 
is so much like Bolton’s that its assignment to the Me- 
gasecoptera is highly probable. At any rate, none of 
these nymphs, which, incidentally, show the usual type 
of wing development, can be referred to the Palaeo- 
dictyoptera. For the present, therefore, we remain in 
complete ignorance of their immature stages. 
Literature Cited 
Bolton, H. 
1921. A Monograph of the Fossil Insects of the British Coal Mea- 
sures, Part. I. Palaeont. Soe., 1919: 1—80. 
Forbes, W. T. M. 
1943. The Origin of Wings and Venational Types in Insects. Amer. 
Midi. Nat., 29: 318-405. 
Goldenberg, F. 
1875. Fauna Sarsepontana Fossilis. Die fossilen Tliiere aus der 
Steinkohlenformation von Saarbriicken, 1 : 1-26. 
Guthorl, P. 
1934. Die Arthropoden aus dem Carbon und Perm des Saar-Nahe- 
Pfalz-Gebietes. Abhandl. Preuss. Geol. Landes., 164: 1-219. 
Handlirsch, A. 
1906. Die fossilen Insekten. Leipzig. 
1911. New Palaeozoic Insects from the Vicinity of Mazon Creek, 
Illinois. Am. Journ. Sci., 31(4): 353-377. 
1922. Insecta palasozoica. Foss. Cat., 16(1): 1-230. 
