220 
Psyche 
[June-September 
Order Diaphanopterodea 
Diaphanopteroidea Handlirsch, 1919, p. 575. 
Diaphanopterodea Rohdendorf, 1962, p. 69; Carpenter, 1963, p. 253. 
[= Palaeohyrnenoptera Haupt, 1941, p. 99.] 
Family Prochoropteridae 
Prochoropteridae Handlirsch, 1911, p. 375. 
Fore wing: similar to that of the Elmoidae but with SC extending 
much farther beyond the origin of RS than in Elmoa; stem of R 
without a prominent bend at the point of divergence of CUA; cross 
veins weakly developed, without branching. Hind wing: similar to 
the fore, so far as known, but relatively broader and with its hind 
margin more curved; coalescence of RS with MS apparently less 
than in the fore wing. Thorax large, but prothorax small and 
conical; head small (from above). 
Type-genus: Prochoroptera Handlirsch. A second genus, Eu- 
choroptera Carpenter (1940), from the Pennsylvanian of Kansas 
(Stanton Formation), also appears to belong to this family; little is 
known of its wing venation, but the body structures are like those of 
other Diaphanopterodea. 
Genus Prochoroptera Handlirsch 
Prochoroptera Handlirsch, 1911, p. 376. 
Since this genus is monospecific, its characteristics can only be 
suggested. In all probability the coalescence of MA with RS and the 
distal forking of MP are in this category. Prochoroptera differs 
from Euchoroptera in having the branching of RS pectinate, instead 
of dichotomous. 
Type-Species: Prochoroptera calopteryx Handlirsch. 
Prochoroptera calopteryx Handlirsch 
Figures 1-3 
Prochoroptera calopteryx Handlirsch, 1911, p. 376; 1919, p. 586; 1920, p. 172. 
Haupt, 1941, p. 99. Laurentiaux, 1953, p. 444. Carpenter, 1940, p. 638; 1947, p. 45; 
1963, p. 248. 
The fore wing is known to a length of 20 mm; estimate of 
complete length (based on Euchoroptera ), 36 mm; maximum width, 
6 mm. Hind wing: known to a length of 20 mm; maximum width, 6 
