Female biting midges of the subgenera Microhelea Kieffer, Pterobosca Macfie, and Trichohelea Goetghebuer of the genus Forcipomyia Meigen feed on the hemolymph of arthropod hosts, as do some species of the closely related genus Atrichopogon Kieffer. Arthropod hosts include Opiliones (Lane, 1947), Araneae (Clastrier and Legrand, 1991), Odonata (Macfie, 1932; Wirth, 1956a; Clastrier and Legrand, 1990), Phasmida (Wirth, 1971; Clastrier and Wirth, 1995), Orthoptera (Wirth and Castner, 1990; Perez-Gelabert and Grogan, 1999), Hemiptera (J. Reid, pers. comm. fide [Lane, 1977]; Clastrier and Del?colle, 1997), Neuroptera (Tokunaga and Murachi, 1959; Wirth, 1956a, 1966), Megaloptera (Wirth, 1956a), Cole?ptera (Wirth, 1956b, 1980), Diptera (Wirth, 1956a), Hymenoptera (Wirth, 1956a), and Lepidoptera (e.g., Wirth, 1956a, 1972; Lane 1977, 1984). At least four records of Forcipomyia species feeding from the wings of Geometridae exist: F. {Trichohelea) tonnoiri (Goetghebuer), which was reported from two geometrids, Ectropis crepuscularia (Denis and Schifferm?ller) and Alcis bastelbergeri Hirschke (previously Boarmia repandata L.) in Switzerland (Edwards, 1925); an unidentified species said to be near F. (Synthyridomyia) murina (Winnertz), discovered on the wing of Perizoma didymata (L.) in Denmark (Kryger, 1914); and Forcipomyia (Trichohelea) pec?nunguis (de Meijere) on Cleora immemorata (Walker) in New Caledonia (Clastrier and Del?colle, 1991). We report new records for F. (T.) pec?nunguis on Geometridae and a significant extension of the known geographical range of this ectoparasitic midge. Taxonomy for ectoparasites and hosts follows Borkent and Wirth (1997), and Scoble (1999), respectively. Forcipomyia (T.) pec?nunguis is known from the Caroline Islands (Tokunaga, 1940), Mariana Islands (Tokunaga and Murachi, 1959), New Caledonia (Clastrier and Del?colle, 1991), Samoa (Wirth, 1956a), Sumatra (de Meijere, 1923; Macfie, 1934), New Guinea and Australia (Debenham, 1987), and Viti Levu, Fiji (two female specimens examined in the collection of the National Museum of Natural History, Museum Support Center, Suitland, Maryland). Hosts noted in publications are moths in the families Arctiidae, Crambidae, Geometridae, Noctuidae, and Sphingidae. We report F. (T.) pec?nunguis from Malaysia and Taiwan feeding on seven geometrid species, summarized in Table 1. Four hosts with attached midges are illustrated: Ourapteryx sp. (Fig. 1), Hemithea aquamarina Hampson (Fig. 2), Tanaorhinus raffiesii Moore (Fig. 3), and Scopula sp. (Fig. 4). In total, we recorded twenty females off. (T.) pec?nunguis on the forewing dorsal surface of seven individual moths (Table 1). Parasites were collected from hosts attracted to 175-watt mercury vapor lights in Malaysia and Taiwan in August 2004 and 2005. Parasites and their hosts were collected by AYK and WWH. Additional ectoparasitic flies were observed; unfortunately we were unable to collect them. Data for collected specimens are: Taiwan, Nantou County, Shanlinhsi (=Sanlinchi, 23?38'11N 120?46'50E), 4-viii-2004; same locality, 15-viii 2005; Malaysia: Pahang, Cameron Highlands (4?29'1N 101?27T'E), 10-viii-2004; Kelantan, Route 4 between Gerik and Jeli (5?31 '30N 101?16'30E), 12-viii-2004. One female fly from Taiwan was slide mounted in Euparal and the remaining specimens currently are stored in 1.5 ml vials containing 100% ethanol. Specimens were compared with the original description (de Meijere, 1923) and with six specimens from Samoa and Fiji. The six specimens are in the Museum Support Center, National Museum of Natural History, Suitland, Maryland; identification was further verified through taxonomic keys in Wirth (1956a) and Debenham (1987). Specimens are deposited in the National Museum of Natural History, Washington, D.C. Fifteen of the flies were found on forewing vein A1+2, and two were found on the cubitus. Three additional flies were found in the anal cell several millimeters from vein A1+2. These three flies had their heads embedded