There are "two" beetles in that area. Open your Quest Log file and see which one you are still missing:
1. For the Tomb of Storms, turn around and look behind the Sphinx Head after you come thru that portal.
2. For the Well of Spirits, climb up the stairs near the D'jeserit Family Tomb, go past the D'jeserit Family Tomb entrance, then turn left, and look behind the giant krok statue that is the centerpiece of the Well of Spirits.
It sounds like you might have already picked up #1 above. Try looking for #2 above.