In the Black City of the Djinn

If there are any weird tale fans out there, perhaps you can help me in identifying the name and author of a short story.

The story in question is similar in nature to Robert E. Howard's The Fire of Asshurbanipal: protagonist, being chased by raiders/brigands/what-have-you, takes refuge in an abandoned city.  In the city, in a prominent place, is the corpse of a king/priest/somebody important, with some sort of riches on them.  (I believe in this case it was either a necklace or a crown.)

The brigands/raiders follow the protagonist into the city, and engage in a battle which the protagonist loses.  One of the brigands/raiders mounts the stairs to retrieve the treasure from the corpse and dies shortly after touching it, thereby scaring off the rest of his companions.

In The Fire of Asshurbanipal, the reason behind this is that the jewel is cursed, and  touching it unleashes an ancient guardian who belongs to that set of Things that have walked the Earth since before Man crawled out of the primordial ooze.

In the story I'm thinking of, there's a less preternatural explanation: a snake has made a nest in the corpse's skull, and promptly bites the man when it is disturbed.

I'm positive I'm not imagining this story, as Becca's pretty sure she's read it as well.  I'm thinking it may be Clark Ashton Smith, but I won't know until I've had a chance to search through all the stories I have by him (and then all my other weird tale books, if it isn't him).

So, anybody read it and recall what it was called or who it was by?