From Ohio History Central
This fine example shows a large example of a member of the Belostomatidae, or giant water bugs.
Fossil insect remains are known from Pennsylvanian rocks in eastern Ohio. Although they are rare fossils, some of them are spectacular because of their large size and preservation. Cockroaches nearly four inches in length have been found. Insect wings found in these rocks are commonly confused with fossil leaves. Perhaps the rarest arthropod fossils are those of spiders. A few specimens are known from Pennsylvanian rocks in eastern Ohio. The preservation of these specimens is remarkable and they look superficially similar to some modern spiders.