Metadrinomyia xanthokolos Byun and Han

Byun, Hye-Woo & Han, Ho-Yeon, 2009, A taxonomic revision of the genus Metadrinomyia Shima (Diptera: Tachinidae) with descriptions of two new species, Zootaxa 2311, pp. 55-65 : 61-63

Metadrinomyia xanthokolos Byun and Han , sp. nov. ( Figs. 1 E–H, 2E–H, 3G–I, 3K)

Diagnosis. Metadrinomyia xanthokolos can be readily distinguished from its dark-legged congeners by the yellow brown legs ( Figs. 1 F, 1H).

Description. Male. Body almost entirely dark brown with yellow brown pruinosity; wing length 5.1– 5.9mm; thorax length 2.4–2.8mm. Head ( Figs. 2E–F ) with frons-head ratio 0.27–0.32, eye ratio 0.55–0.68, gena-eye ratio 0.06–0.08, arista-antenna ratio 0.9–1.1; inner vertical seta 0.51–0.57x as long as longest diameter of eye; outer vertical seta 0.42–0.48x as long as inner vertical seta; ocellar seta 0.50–0.75x as long as inner vertical seta; postocellar seta 0.35–0.48x as long as inner vertical seta; paravertical seta short but clearly discernible, about 0.22–0.27x as long as inner vertical seta; fronto-orbital plate with yellow brown pruinosity, without setulae; 7–8 frontal setae, above level of aristal sockets; proclinate orbital seta absent; 2 reclinate orbital setae 0.59–0.65x as long as inner vertical seta; frontal vitta black, bare; pedicel, scape and flagellomere 1 dark brown with yellow brown pruinosity; aristomere 1 as long as wide; aristomere 2 twice as long as wide; basal 1/4–1/5 of aristomere 3 thickened; flagellomere 1 slender, about 2.9–3.4x as long as wide; parafacial with densely yellowish brown pruinosity, bare, 0.83x as wide as flagellomere 1; postgena moderately swollen with relatively long whitish yellow setulae, mixed with several black setulae anteriorly; palpus orange brown with dark brown setulae. Thorax ( Figs. 1 E–F) almost entirely dark brown with yellow brown pruinosity; postpronotum with 2 setae; scutellum with 3 scutellar setae, subapical seta 2.6–3.3x as long as scutellum length, lateral seta 0.87x to as long as subapical seta, basal seta 0.44–0.63x as long as subapical seta, discal seta hair-like, apical seta not recognizable; anepisternum with 1–2 small setae anterodorsally; posterior spiracle with reddish brown hairy lappet; prosternum medially with 0–3 setulae. Legs ( Fig. 1 F) almost yellow brown with dark brown setae and setulae; midtibia with 1 anterodorsal and 2 posterior setae; tarsal claws as long as 5th tarsomere. Wing ( Figs. 1 E–F) hyaline with slightly dark brown tinge; wing-thorax ratio 2.1–2.2, vein R4+5 ratio 2.4–3.0, vein M ratio 0.9–1.2, subcosta-costa ratio 0.50–0.64; fork of R2+3 and R4+5 dorsally and ventrally with 1 tiny seta each; tegula blackish brown; basicosta yellow to orange brown. Abdomen dark brown in ground color with yellow brown pruinosity. Genitalia (Figs. 3G–H) yellow brown to dark brown; sternite 5 (Fig. 3I) with V-shaped median cleft, half as deep as sternite length; epandrium anterolaterally without setae; cerci narrow in lateral view, equilateral triangular in posterior view, apically divided, extending far beyond tip of surstylus.

Female. ( Figs. 1 G–H, 2G–H, 3K) similar to male except for the following non-genitalic characters: Body with more whitish pruinosity; wing length 4.5–5.8mm; thorax length 2.0– 2.7mm. Head with eye ratio 0.58– 0.61; inner vertical seta 0.56–0.60x as long as longest diameter of eye; outer vertical seta 0.48–0.55x as long as inner vertical seta; first flagellomere 3.3–4.3x longer than wide; usually with 1 reclinate orbital seta, 0.54– 0.64x as long as inner vertical seta. Wing with wing-thorax ratio 2.2–2.3, vein R4+5 ratio 2.80–3.2. Base of hook-like sternite 7 in postabdomen (Fig 3K) with distinct ventral hump.

Type material. Holotype male: SOUTH KOREA, Gangwon-do, Wonju-si, Heungeop-myeon, Yonsei Univ. Campus, 23.VI.2006, H.-W. Byun. Paratypes: SOUTH KOREA: Chungcheongbuk-do: Chungju-si, Jongmin-dong, from recreation forest to Mt. Gyemyeongsan (775m) peak, 2.VII.2003, D.-S. Choi et al., 2f. Gangwon-do: Wonju-si, Gwirae-myeon, Gwirae-ri, black + mercury vapor light trap, H.-Y. Han & H.-W. Byun, 1m; Wonju-si, Heungeop-myeon, Yonsei Univ. Campus, 21.VI.2003, H.-S. Lee, 1m, 1f; same data except 28.VI.2003, 1f; same data except 9.VII.2004, H.-W. Byun, 1f; same data except 3.VI.2005, H.-W. Byun & S. Hwang, 1m; same data except 19.VI.2005, H.-W. Byun, 3f; same data except 21.VI.2005, 2f; same data except 22.VI.2005, B. Merz, 1m, 1f; same data except 23.VI.2005, B. Merz & H.-S. Lee, 1m; same data except 24.VI.2005, H.-W. Byun, 3f; same data except 28.VI.2005, 2f; same data except 2.VII.2005, 3f; same data except 4.VII.2005, 3f; same data except 5.VII.2005, 3f; same data except 6.VII.2005, 4f; same data except 8.VII.2005, 3f; same data except 13.VII.2005, 1f; same data except 22.VII.2005, 1f; same data except 12.VI.2006, 2m; same data except 23.VI.2006, 1m; same data except 3.VII.2006, S. Hwang et al., 2f. Gyeonggi-do: Gwangjeon-ri, 8.VI.1983, H.-Y. Han, 1m; same data except 23.VI.1983; same data except Cheonggyesan, 14.VII.1984, H.-Y. Han & K.-E. Ro. Gyeongsangbuk-do: Youngju-si, Buseok-myeon, Mt. Seondalsan (1,236m), from Namdae-ri, 29.VI.1998, H.-Y. Han et al., 1f. Gyeongsangnam-do: Ulju-gun, Sangbuk-myeon, Icheon-ri, Mt. Gajisan, 28–30.VI–1.VII. 1990, H.-J. Kim, 1f; same data except Sancheonggun, Samjang-myeon, 12–13.VII.1990. D.-S. Ku, 1f. The above type series is deposited in YSUW.

Distribution. South Korea.

Etymology. The specific epithet is derived from the Greek ‘xanthos’, meaning yellow, and ‘kolos’, meaning leg, referring to the yellowish legs of this species.

Figures

FIGURE 1. A – B. Metadrinomyia flavifrons sp. nov., male. C – D. Same, female. E – F. M. xanthokolos sp. nov., male. G – H. Same, female. I – J. M. proclinata Shima, male.

FIGURE 2. A – J. Heads. A – B. Metadrinomyia flavifrons sp. nov., male. C – D. Same, female. E – F. M. xanthokolos sp. nov., male. G – H. Same, female. I – J. M. proclinata Shima, male. K. M. argentea Shima, holotype female. L. M. proclinata Shima, holotype male.