A total of 7,125 blood engorged Culicoides representing 6 species were collected over a 2 year period from a stable trap baited with Onchocerca cervicalis-infected ponies. Specimens that survived 10-14 days postfeeding were dissected and examined for advanced stages of parasite development. Only C. variipennis supported growth of ). cervicalis with the natural infection rate being 7%.