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wobblyprop I knew you'd ask, I had to look up the name of these things. If you look under the wing you will see vortilons. They are box shape objects tapered at the forward and trailing edge.
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I had never heard of these vortilons. but now I see good pictures of of them on a Hawker 800XP in "Flying" magazine, November, 2002, p. 70 and 75. They seem to be pointy things projecting downwards and in front of the wing leading edge about 1/4 or 1/3 of a wing length out from the wing root to the wingtip. The caption says "The vortilon, like the stall fence, improves aileron effectiveness at low speeds".
This
picture of a Hawker 800 XP shows a vortilon as a small white feature under the leading edge of the wing immediately under the engine intake.
I understand from browsing the net that vortilons are popular on Long-ezes and are very effective in increasing stability at low speeds.