Abstract
The Ecuadorian Agromyzidae described by Theodor Becker from the Mission du service géographique de l’armée pour la mesure d’un arc de méridien équatorial en Amérique du Sud are revised and several taxonomic changes are proposed. The eight named species identified by Becker actually comprise 14 species of Agromyzidae (3 Melanagromyza, 4 Cerodontha, 6 Liriomyza, 1 Nemorimyza) and one species of Heleomyzidae. Three new species are described: Cerodontha (Cerodontha) angela Boucher sp. n.; Liriomyza biensis Boucher sp. n.; Melanagromyza pontis Boucher sp. n. New species records for Ecuador include Melanagromyza memoranda Spencer; M. lini Spencer; Cerodontha (C.) colombiensis Spencer; Liriomyza nigra Spencer and Nemorimyza fuscibasis (Malloch). Cerodontha (C.) nigricornis Becker is redescribed, including the first description of the male genitalia. Liriomyza biformata (Becker) is redescribed and two species are included as junior synonyms of L. biformata: Agromyza braziliensis Frost syn. n. and A. ecuadorensis Frost syn. n. Agromyza bipartita Becker is transferred to the family Heleomyzidae as Notomyza bipartita comb. n.