Hey Pat,
That is Yew. I'll try it on some locust and see how it works. As you know, a lot of times the real difficulty is with the inner bark. This provides a way to soften up the inner bark and lift it off without damaging the wood you'll use for the back of the bow. I much prefer getting bark off and sealing with shelac (if necessary) to cutting it off when it's seasoned. I know that with Osage, Locust, Mullberry, etc, that isn't an advantage, but there are many times when it's a huge advantage. I like cutting wood in the winter and this makes it even more practical.
J. D. Duff