Diadiplosis duni (Harris) [Figs 12 a–g] Nipponodiplosis duni Harris, 1968: 460. Diadiplosis duni (Harris): Gagné 2004: 144, new combination. Type series. Holotype: male (No 16198), 2 paratypes males (Nos 16199–16200), paratype female (No 16211), Kerevat, New Britain, Papua New Guinea, ex Planococcus sp. on cacao pods, i-1965; 4 paratype males (Nos 16613–16615, 16634), 3 paratype females (Nos 16635, 16636, 16663), same locality as holotype, ex Planococcus citri (Risso), vii-1965. The entire type series is deposited in the BMNH. Description. Wing with R 5 joining C at wing apex [Fig. 12a]. Palpus 3-segmented. Occipital protuberance absent. Flagellomeres 12. Male third flagellomere [Fig. 12b]: basal node as wide as long, internode half-length basal node, distal node slightly constricted, about 1.5x longer than wide, neck half-length distal node, circumfilar loops of basal node reaching base of distal node, basal loops of distal node reaching node midhalf, distal loops reaching neck’s end. Female flagellomeres [Fig. 12e] twice as long as wide, circumfila consisting of two transverse and two longitudinal, interconnected bands. Tarsal claws toothed on all legs. Male terminalia [Figs 12c, d]: aedeagus substantially longer than cerci and hypoproct, gonostylus widest at basal third, gonocoxal apodemes not fused anteriorly, shorter than distance between them. Female terminalia [Figs 12f, g] with cerci rounded, 2x longer than wide. Pupa, larva unknown. Remarks. Diadiplosis duni differs from D. smithi in the tarsal claws being toothed on all legs as opposed to only on forelegs (Harris 1968); the aedeagus being substantially longer than the hypoproct and cerci as opposed to as long as hypoproct and cerci; and gonocoxal apodemes being shorter [Fig. 12d] as opposed to longer than distance between them [Fig. 13g]. Biology. Larvae of this species were found preying on mealybugs Planococcus sp. (Hemiptera: Pseudococcidae): P. citri on citrus in Papua New Guinea and P. lilacinus on cacao pods in Indonesia (Harris 1968). On all three occasions where they were found, Diadiplosis smithi was also present (Harris 1968). Geographical distribution. This species has been recorded in Papua New Guinea from Kerevat on the island of New Britain and in Indonesia from Bogor, Java, 2-iv-1937 (Harris 1968).

Published as part of Kolesik, Peter & Gagné, Raymond J., 2020, A review of the gall midges (Diptera: Cecidomyiidae) of Indonesia: taxonomy, biology and adult key to genera, pp. 1-82 in Zootaxa 4847 (1) on pages 26-27, DOI: 10.11646/zootaxa.4847.1.1, http://zenodo.org/record/4406856