i86 
Psyche 
[June 
rows of cells in a few areas. Hind wings (known only in Protoperla) : 
Rs arising nearer the wing base than in the front wing; CuA fused 
with the very base of M ; anal area expanded to form a distinct lobe. 
From a study of the type material of Protoperla Palaeocixius , 
Fayoliella and Hadentomum, I am convinced that these genera belong 
to one family, for which the oldest name is Protoperlidae. This 
family is now known from Upper Carboniferous deposits in Europe 
and North America. 
Genus Hadentomum Handlirsch 
Handlirsch, 1906, Proc. U.S.N.M., 29: 693 
Fore wing: similar to that of Palaeocixius but having a coarse 
reticulation between Ri and Rs. Hind wing: incompletely known, 
but probably with a small, distinct anal lobe, as in Protoperla. Type- 
species: Hadentomum americanwn Handlirsch. 
Hadento?num americanum Handlirsch 
Figure 6 
Handlirsch, 1906, Proc. U.S.N.M., 29: 693, fig. 19-21. 
Length of fore wing, 23 mm. ; width of fore wing, 7.3 mm. Length 
of hind wing, 23 mm. Type, no. 35579, U.S.N.M., collected near 
Morris, Illinois (Westphalian age). 
This species was based on a unique specimen consisting of the 
obverse, in the Daniel’s collection, and the reverse in the U.S. 
National Museum. Since the location of the Daniel’s collection is 
unknown, I have been able to study only the specimen in the National 
Museum. The preservation of this fossil is not very satisfactory; the 
two wings on one side, as shown in Handlirsch’s figure, overlap in 
such a way as to interfere with the determination of the venational 
pattern. However, by tracing on photographs the veins of one wing 
with ink of a certain color and the veins which are apparently not 
related to that wing with ink of another color, I have found it possible 
to work out the venational patterns of the two wings saisfactorily. 
My interpretation of the wings is shown in figure 6. In most respects, 
the figure of the fore wing agrees with that of Handlirsch. However, 
the base of M, which Handlirsch shows fused with R, is distinctly 
free and independent; also, the fork of Cu is clearly preserved in the 
fossil, although it is not represented in Handlirsch’s figure. The origin 
of R4 + 5 is not visible in the National Museum specimen; possibly 
it was preserved in the Daniel’s specimen. The convexities and con- 
cavities of the veins are clearly preserved and are marked in figure 6. 
It will be noted that Rs is concave, the media is neutral ( ± ) , CuA 
