Three new scale insects are recorded from French Guiana: Ceroplastes floridensis Comstock, 1881, Milviscutulus mangiferae (Fernald, 1903) (Coccidae) and Nipaecoccus nipae (Maskell, 1893) (Pseudococcidae) on Mangifera indica (Anacardiaceae). (Résumé d'auteur