The genus Forcipomyia Meigen comprises midges of various habits, feeding on a high variety of fluid sources. Females of the subgenus Pterobosca Macfie are odonate and lacewing ectoparasites, from which they obtain the wing vein hemolymph. From the 21 known species of Forcipomyia (Pterobosca). three are represented in the neotropical region, viz. Forcipomyia (P.) farri Wirth, F. (P) fusicornis (Coquillett) and F. (P.) incubans (Macfie) (BORKENT & WIRTH, 1997, Bull. Am. Mus. nat. Hist. 233: 1-257). The last mentioned species remains so far the sole representative in Argentina. It is a parasite in the Libellulidae (Micrathyria sp. and Erythrodiplax sp.) and Gomphidae (CAVALIER1 & CHIOSSONE, 1965, Neotropica 11 [35]: 64-70) in the delta of the Paraná River (Tigre and Campana. Buenos Aires province). Unfortunately, the specimens studied by CAVALIERI & CHIOSSONE (1965, op. cit.) are apparently lost and cannot be traced either in collections of the Museo Argentino de Ciências Naturales “Bernardino Rivadavia” (Bachmann, pers. comm.) or in those of the Instituto “Carlos G. Malbrán” in Buenos Aires (Mariluis, pers. comm.).