Mycomya apoensis sp. n.

Figs. 1 A–F

Material studied. Holotype. ♂. PHILIPPINES, Mindanao, Mt. Apo, Agko – Lake Binado 1350–2300 m alt. (holotype collected on the way between the two localities), 3–5.viii. 1978, Nakanishi, A. & Yata, O. leg. (KUC). Paratypes. Same data, 12 ♂♂ (KUC); same data but 3.VIII. 1978, 4 ♂♂ (KUC).

Description. ♂. Head. Palp, other mouthparts and face yellow, posterior parts of head brownish. Antenna brownish, scape, pedicel and base of 1st flagellomere yellow. 1st flagellomere about 4x its width, 2nd flagellomere 2.5x its width. Thorax. Pronotum yellow, with 3–4 long setae. Scutum entirely light brownish or yellow with 3 brown longitudinal, posteriorly fused stripes. Anepisternum yellow to yellowish. Preepisternum entirely yellow or with ventral half light brownish. Scutellum brownish, with 4 long setae. Laterotergite yellowish to brownish.

Mediotergite yellowish to brownish, bare. Wing. Length 2.7–3.7 mm. Wing hyaline. Sc ending in R1 slightly distad or proximad of middle of small cell, Sc1 missing. Apical part of Sc bearing 1–6 small setae. Small cell 1.5– 2 x as long as wide. Cu fork distinctly distal to M fork. M ratios: 0.87–1.14, 1.30–1.56. Cu ratios: 1.00–1.07, 1.56–1.74. Small setae: M petiole: 0; M1: 0; M2: 0; Cu petiole: 0; Cu1: 0; Cu2: 0. Halter pale yellowish, apex brownish. Legs. Coxae and femora yellow, tibiae and tarsi brownish to brown. Coxa 2 without spur. Leg ratios: bt1:t1 = 0.79–0.82, bt2:t2 = 0.66–0.67, bt3:t3 = 0.53–0.60. Abdomen. Brownish. Hypopygium. Figs. 1 A–F, yellowish. Tergite 9 with two pairs of combs. Outer combs widely separated from each other, both with 10–12 spines (Fig. 1 A). Tergal lateral appendage long, about 6x as long as its width, curved and setose, its apex with some curved, flattened setae (Fig. 1 D). Sternal submedian filament missing (Fig. 1 B). Gonostylus about 5x as long as its width, with 5 subapical-apical teeth and membranous lateral lobe about ½ of length of main branch of gonostylus (Fig. 1 E). Aedeagus deeply bilobed (Figs. 1 B, 1F).

Discussion. Mycomya apoensis belongs to the almost cosmopolitan subgenus Mycomyopsis, based on the presence of the long, setose tergal lateral appendages, the pairs of combs in the tergal part of the hypopygium, and the sternal synsclerite divided into two lateral parts bearing no lateral appendages (Väisänen 1984a). Its long, curved tergal lateral appendage (Fig. 1 D) resembles those of M. jeti Väisänen (2013c: fig. 10C) M. minutata Edwards, 1931 (Fig. 3 D), and M. ducula Väisänen (2013c: fig. 8C) . Mycomya jeti has a short, almost straight sternal submedian filament (Väisänen 2013c: figs. 10B, 10D), whereas in M. apoensis the sternal submedian filament is missing (Fig. 1 B). Mycomya minutata (Fig. 3 E) and M. ducula (Väisänen 2013c: fig. 8D) have a short curved spur in their gonostyli, while M. apoensis lacks the spur (Fig. 1 E).

Etymology. The species is named after Mount Apo, its type locality.