Two Manhattan women say they fled their Washington Heights apartment in horror after discovering it was already occupied — by bats.

Dimitra Mallarios, 56, and Irene Katehis, 23, say in their lawsuit they were duped into paying a full year’s rent for a $2,500-a-month apartment at 640 Fort Washington Ave., but soon found they weren’t alone.

Two days after they moved in, “Mallarios encountered a bat . . . flying around one of the rooms,” the suit says.

She called the building’s super, who “was able to catch the bat in a plastic bag and remove it from the premises.”

Four nights later, they “were getting ready for bed when Mallarios noticed a weird bustling coming from her window,” the suit says, and when Mallarios went to investigate the sound, “a bat flew out from behind the curtain headed directly at” her.

They also got a painful souvenier — their doctor noticed two marks on Katehis which they believe “were caused by a bat while Katehis was asleep.”