This is listed as extinct by most sites I've looked at. IUCN still says they are critically endangered. They haven't been seen in possibly 100 years though, so most likely they are extinct. Not much is known about them. Really it is pretty much just assumed they were similar to other narrow-winged damselflies. I could not find any pictures of them, even of preserved specimens. I contacted a museum that one site said had some and a nice man I assume is an entomologist sent me a description by someone named Perkins, who saw them, that was written back in 1899. He said that their specimens are over 100 years old, so the colour is faded to brown and not at all accurate. He also told me a different damselfly I might be able to find more pictures of to get the structure from. There weren't many pictures of that kind but there was at least one fairly good one (though a profile, so I am guessing on the face based on other species).
This is the description. I apologize, I do not know what publication this is from, or what Perkins' first name is. This is from what was sent to me, which was 2 pages out of a larger document. I am not as good with bug anatomy as I am with mammal, bird, or even fish anatomy. I am hopeful that my take is at least close to the actual damselfly. The one I painted is the male, hence why the face below the antennae is pretty much entirely red. I have not included the whole of the abdomen obviously, and since the first four segments were "nearly entirely red", I'm thinking I got that fairly close. I will update this with corrections if I learn I've completely missed the mark on some of it. I will also share the entomologist's response to the painting, but only if he gives me permission to.