A new species of Ophiogomphus from eastern North America, with a key to the regional species (Anisoptera: Gomphidae)

O. acuminatus sp. n. (d holotype, 9 allotype: Jacks Branch 12 km north of U.S. Route 64 along Natchez Trace Parkway, Lewis Co., Tennessee, USA) is described from adult and larval material and its affinities discussed. Photographs of the 6 terminalia and secondary genitalia of O. acuminatus sp. n. and O. edmundo Needham are presented, A key to the adult Ophiogomphus of eastern North America is presented along with a summary of their known distributions.