The species of Onchocerca described in this paper was received some months ago from Mr. J. L. Stewart, M.C., M.R.C.V.S., from Tamale, Gold Coast Colony. The cysts containing the parasites are found most commonly in the subcuticular connective tissue of the inter-costal muscles; but they are also found elsewhere, usually in a superficial position. Mr. Stewart in a letter accompanying the material, draws attention to their superficial resemblance to Cysticercus bovis.