1971] Carpenter & Richardson — Pennsylvanian Insects 
281 
sc - 
Figure 10. Spilaptera americana, n.sp. Drawing of holotype, No. H 
463, Herdina collection. Length of wing as preserved, 38 mm. 
and oblique cross veins present and it is accordingly placed in the 
genus Spilaptera. The several other known genera of Pennsylvanian 
Spilapteridae, including Mcluckiepteron , have very distinctive fea- 
tures, such as numerous cross veins, more extensive branching of 
veins, pronounced tapering of wing, etc. 
Spilaptera americana, n.sp. 
Figure 10 
Length of wing (as preserved) 38 mm.; maximum width, 15 mm. 
Costal margin distinctly concave, slightly more so than in the type 
species of the genus, S. packardi ; Sc extending to wing apex; Rs 
with 6 terminal branches, none forked in types; MA with 4 branches, 
CuA with 5 ; CuP deeply forked, almost to its origin. Cross veins 
not numerous, about as many as in S. packardi , forming poorly de- 
fined rows. The sigmoidal cross veins between Ri and Rs are long 
and more oblique than in S. packardi. The wing markings consist of 
darkened spots at most of the cross veins. 
Holotype: No. H463, in the collection of Mr. Jerry Herdina, 
Berwyn, Illinois; collected in Pit Six. This is a very well preserved 
fore wing, lacking the apex and the basal region ; the wing was ob- 
viously broken along the line of the cuticular thickenings, as in the 
type of H. dahasinskasi. 
Paratype: No. H459, in the Herdina collection; collected in Pit 
Six. This consists of a less clearly preserved and more fragmentary 
wing; the preserved part is 33 mm. long and 15 mm. wide. 
Although these two specimens have virtually an identical venation, 
they do show one difference. As Dr. Kukalova has pointed out ( 1969, 
p. 166), the spilapterids often have some kind of supporting struc- 
