1971] Carpenter & Richardson — Pennsylvanian Insects 
291 
Genus Herdina, new genus 
Fore and hind wings short, the fore wing extending to about the 
middle of the abdomen. 10 Fore wing: longitudinal veins, including 
Sc and Ri, somewhat irregular, cross veins unusually strong, nearly 
as thick as the longitudinal veins; costal area moderately broad, 
with two rows of irregular cells along most of the area; Rs forking 
into two main branches shortly after its origin at about mid-wing; 
secondary branching irregular, with short rows of convex intercalary 
veins between the normal branches of Rs; MP apparently with one 
prominent branch arising at about mid-wing; CuA apparently un- 
branched; CuP forked shortly after its origin, one branch directed 
towards the hind margin ; between CuP and CuA is a short, irreg- 
ular intercalary vein; anal veins very weakly developed and irregu- 
lar. Hind wing: costal area narrow; venational pattern basically 
similar to that of the fore wing, including CuA and CuP. 
Type species: Herdina mirificus , n.sp. 
The genus is named for Mr. Jerry Herdina, of Berwyn, Illinois, 
in recognition of the contribution which he has made to insect paleon- 
tology through his extensive and remarkable collection of arthropods, 
preserved in the Mazon Creek nodules. 
Herdina mirificus, n.sp. 
Figures 15-20 
Fore wing: length, 8 mm.; width, 3.5 mm.; hind wing: length, 
5.5 mm.; width, 2.3 mm.; length of prothorax, 5 mm.; length of 
abdomen, 10 mm. It is virtually impossible to assign other specific 
characters for this species; venational details are shown in figures 
17 and 18. As can be seen from these figures, there are some differ- 
ences in the venation of the two right wings, such as in the amount 
of the irregularity of the longitudinal veins and the shapes of the 
various cells of the wings; but these are within the normal range of 
variation in the species of Recent Orthoptera. 
Holotype: No. H 412a and b (obverse and reverse) in the col- 
lection of Mr. Jerry Herdina, Berwyn, Illinois; it was collected at 
Pit Eleven. The specimen consists of two fore wings and one hind 
wing, as well as parts of the thorax and abdomen.* * 
There are several remarkable and puzzling features about this 
fossil. As can be seen from comparison of the obverse and reverse 
10 The brachypterous condition is here treated as a generic characteristic 
but it could equally well be a specific or an individual trait. 
*A second specimen of Herdina has just been found (5/27/72) in the 
ironstone nodules (Wolff collection). It will be discussed in another article. 
