Use the dominant hand "X" finger to represent a stinger.
The "X" hand makes a quick down and up movement (as if having stung
the non-dominant hand). Note: You don't actually have to make
contact as long as you come "close."
STING: Version 2
This version of the sign only uses a quick downward movement.
Either version is fine.
You can learn
American Sign Language (ASL) online at American Sign Language University ™
ASL resources by Lifeprint.com © Dr. William Vicars