realfinney

Delta Green's "The Night Floors" form Count Down really delivered on this for me. The book as a whole has a lot of good stuff, especially on Spolier Hastur (which is drawn on for Night Floors)

I believe the original Tales of the Miskatonic Valley includes a Scenario with a Serpent Person.

Also, here is a like to a Starry Wisdom article on Serpent People, I think the "Call of Cthulhu Adventures" section at the end is Scenario seeds rather than references to published adventures.

https://web.archive.org/web/20091105202308/http://www.chaosium.com/chaosium/starry-wisdom/sw3-racesp.shtml

Thank You for these Dean, for those printing at home with our own Unicorn Tears ink, it's great to have such a clean version :D