1965] 
Carpenter — Carboniferous Insects 
187 
Figure 6. Hadentomum amcricanum Handlirsch. Drawing of fore wing 
(A) and hind wing (B). Holotype, no. 35579, U.S.N.M. (original). 
strongly convex and CuP concave. Since there is no indication of a 
distinctly convex MA or concave MP, I have designated the media 
here simply as “M”. It is possible that the vein that has been 
designated R4 + 5 is actually MA, which may be fused basally with 
the radial sector; however, there is no indication of the free basal 
part of such a vein. 
The anterior margin of the hind wing, which is not shown in 
Handlirsch’s figure, can be made out without difficulty in the fossil 
by the use of ammonium chloride. The most significant difference 
between Handlirsch’s interpretation of the hind wing and mine is 
in the nature of the hind margin of the wing. Handlirsch shows the 
hind margin continuing to the base with the uniform curvature of 
the apical region of the wing — that is without an anal lobe. This 
is particularly important, since the absence of an anal lobe would 
virtually eliminate the species from the Protorthoptera. However, 
the National Museum specimen does not show the hind margin basally 
of the termination of Cui ; it is clearly broken away at this point. 
There is no reason, therefore, to assume that the anal lobe was absent, 
and in view of the affinities of the fossil as indicated by the fore 
