Scientific results of the Belgian Mount-Cameroon Expedition (February-April 1981). 3. Fam. Cixiidae, Derbidae, Meenoplidae, Dictyopharidae, Achilidae, Lophopidae, and Tettigometridae (Homoptera - Fulgoroidea). Bulletin de l'Institut Royal des Sciences Naturelles de Belgique Entomologie, 54(6) 1982: 1-18. 13 [Zoological Record Volume 119]