294 
Psyche 
[December 
Figure 20. Herdina mirificus, n.sp. Photograph of central portion of 
fore wing of holotype, No. H 412a, Herdina collection, showing the details 
of veins and the tubercles along the veins. 
frequency with which this condition is found among existing orthop- 
teroids, such as the Orthoptera, Phasmatodea., Blattodea, etc. 
Although the slender band of sclerotization at the base of the cos- 
tal margin is unusual, it is by no means unique; sclerotized areas, 
diversely located, have been found in other orthopteroids, such as 
Nacekomia rossae Richardson (also from the Francis Creek Shale). 
The venation of the wings in Herdina has many of the same fea- 
tures as those of the Cacurgidae, as noted above. The most 
distinctive characteristic is the irregularity of the main veins ; this is 
undoubtedly associated with the thickness of the cross veins, which 
are only slightly less heavy than the main veins. The relatively 
small size of the hind wing of Herdina is also not surprising in it- 
self; its most striking and significant feature is the similarity of its 
venation to that of the fore wing. In all of the Protorthoptera in 
which the hind wing is known, and in the Orthoptera as well, the 
venation of the hind wing is distinctly different from that of the 
fore wing; Rs arises much nearer the base of the wing; CuA is 
unbranched ; and the anal area is enlarged, with several additional 
anal veins. Herdina is the first instance known of an otherwise typ- 
ically protorthopterous insect in which the fore and hind wings are 
virtually homonomous in venational pattern. Unfortunately, nothing 
is known of the hind wings of those Protorthoptera which appear to 
