With your original spelling it could also be chilcostle, which are not used in moles. The chihuacle is a pretty rare chile in the US, although there is a shipper in Bernalillo who always has the dried ones (The Chile Guy), but you have to buy a kilo minimum. Smaller batches are at gourmetsleuth.com. They are used in Oaxacan black moles along with guajillos, pasillas, anchos and chipotles mecos. Oaxaca has another couple chiles of interest regarding chipotles. The pasilla de Oaxaca and the chipotle grande. I buy the P de O and make chipotles in adobo sauce using Mark Miller's easy recipe in the back of The Great Chile Book. I've been eatin them out of the can for about 16 years before they became commonplace. The different chipotles I know of are: moras, smoked chile moritas (red-purple found in grocery stores); chile mecos (smoked jalapenos - tan to brown, hard to find except in some Mexican grocery stores); pasilla de Oaxaca, and chipotle grande. The traditional black mole recipe (where the chihuacle comes in) is delicious, but a bit bitter due to you have to burn up all the seeds saved from the chiles on a skillet and add them into the recipe. I used the black mole from "A Culinary Journey through Oaxaca, Mexico" by Susana Trilling: Ballantine Books, 1999. I'd love to post it but it's three pages! If anyone wants it, how would I get it to them? An email attachment? John S.