I know it says Cat-Men, but that sure looks like a Snake-Man to me.
Also featuring The Corpse Who Wouldn’t Die! and Master Of The Graveyard Ghouls
Also featuring Bride Of The Serpent. This cover was reused for Dime Mystery in 1940. The entire issue can be downloaded here
This cover was later reused for the April 1940 issue.
This entire issue can be downloaded here
Also, The Phantom Sweatshop. This entire issue can be downloaded here
Also, Murder Sends A Valentine