Prodontria longitarsis is a species of flightless beetle in the family Scarabaeidae. This species was first described by Broun in 1909 as Odontria longitarsis. The holotype specimen was collected by George Hudson during the Sub-Antarctic Islands Scientific Expedition and is held at Te Papa.
This species was described by Broun as follows:
This species is found on the Snares Islands.
This insect has been classified as naturally uncommon under the New Zealand threat classification system.