I see where I slipped up. I thought I could recognize the family name from the table of contents in American Beetles, never pausing to realize that their division is a subfamily -- of Staphylinidae.

Jim: I can recognize three genera, the two larger darker ones are Rybaxis (one right, one left), the two smallest ones are Eutrichites zonatus (one is missing head), the rest are at least mostly Brachygluta (probably terebrata, one male is visible at the bottom left area) - maybe some Reichenbachia but would have to see the pronotum clearly in a dorsal view to be sure.
Signs that the light was near a grassy moist marsh/bog or stream/river margin.

That's great!

After reading the Pselaphinae section in White's Peterson Field Guide of Beetles I assumed, because they had flown to light, they might all be Reichenbachia. I'll shoot them individually of course.

The screened porch where these were collected faces a wooded mashy area about 100 meters away.

btw, of the genera you mention, only Reichenbachia is mentioned by White. (I have yet to buy vol. 1 of American Beetles, which would cover them of course.)

Don White's book has its place, on someone else's bookshelf.