Metadrinomyia flavifrons Byun & 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 : 57-61

Metadrinomyia flavifrons Byun & Han , sp. nov. ( Figs. 1A –D, 2A–D, 3A–C, 3J)

Diagnosis. Metadrinomyia flavifrons is similar to M. proclinata in having 1 anterodorsal seta on midtibia and dark brown body coloration, but it can be distinguished from the latter by the following characteristics: 1) flagellomere 1 ( Fig. 2D ) slender, over 3x as long as wide; and 2) tarsal claw at least as long as 5th tarsomere. These two species can be easily separated from the remaining two congeners by having only 1 anterodorsal seta on midtibia.

Description. Male. Body almost entirely dark brown with yellowish brown pruinosity; wing length 5.0– 6.0mm; thorax length 2.6–3.0mm. Head ( Figs. 2A–B ) with frons-head ratio 0.32–0.36, eye ratio 0.54–0.65, gena-eye ratio 0.05–0.10, arista-antenna ratio 0.85–0.95; inner vertical seta 0.57–0.70x as long as longest diameter of eye; outer vertical seta 0.4–0.5x as long as inner vertical seta; ocellar seta 0.60–0.76x as long as inner vertical seta; postocellar seta 0.3–0.5x as long as inner vertical seta; paravertical seta short but clearly discernible, about 0.2–0.3x as long as inner vertical seta; fronto-orbital plate with dense yellowish pruinosity without any setulae; 7–8 frontal setae, above level of aristal sockets; 2 proclinate orbital setae with posterior one 0.66–0.76x as long as inner vertical seta and anterior one 0.80–0.88x as long as posterior one; 1 reclinate orbital seta, 0.50–0.60x as long as inner vertical seta; frontal vitta black, bare; pedicel, scape and flagellomere 1 dark brown with yellowish brown pruinosity; aristomere 1 as long as wide; aristomere 2 twice as long as wide; basal 1/4–1/3 of aristomere 3 thickened; flagellomere 1 slender, about 3.0–3.4x as long as wide; parafacial with dense yellowish brown pruinosity, bare, 0.7–1.0x as wide as flagellomere 1; postgena moderately swollen with relatively long whitish yellow setulae, mixed with several black setulae anteriorly; palpus dark brown with dark brown setulae. Thorax ( Figs. 1A–B ) almost entirely dark brown with whitish gray pruinosity; postpronotum with 3 setae arranged in a straight line; scutellum with 3 distinct scutellar setae; subapical seta 2.5–3.0x as long as scutellum length, lateral seta subequal to subapical seta, basal seta 0.4–0.7x as long as subapical seta, apical and discal setae not recognizable; anepisternum with 1–2 small setae anterodorsally; lappet of posterior spiracle densely covered with reddish brown setulae; prosternum medially with 1–3 setulae. Legs ( Fig. 1B ) entirely blackish brown with dark brown setae and setulae; midtibia with 2–3 anterodorsal and posterior setae; tarsal claws as long as or slightly longer than 5th tarsomere. Wing ( Figs. 1A– B ) hyaline with slightly dark brown tinge; wing-thorax ratio 1.9–2.1, vein R4+5 ratio 3.2–3.7, vein M ratio 1.1– 1.3, subcosta-costa ratio 0.50–0.56; 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 whitish gray pruinosity. Genitalia (Figs. 3A–B) yellow brown to dark brown; sternite 5 (Fig. 3C) posteriorly with V-shaped median cleft, 0.5x as deep as sternite length; epandrium anterolaterally without setae; cerci basally with strong setulae, apically pointed in posterior view; surstylus apically setulose, anterior margin invaginated at about 130° angle in lateral view.

Female. ( Figs. 1 C–D, 2C–D, 3J) similar to male except for the following non-genitalic characters: Body with pruinosity more whitish; wing length 4.4–5.2mm; thorax length 2.2–2.6mm. Head with gena-eye ratio 0.03–0.06, arista–antenna ratio 0.9–1.1; 1 reclinate orbital seta, 0.4–0.5x as long as inner vertical seta. Base of hook-like sternite 7 in postabdomen (Fig 3J) without distinct ventral hump.

Type material. Holotype male: SOUTH KOREA, Gangwon-do, Wonju-si, Heungeop-myeon, Yonsei Univ. Campus, 5.VII.2005, H.-W. Byun. Paratypes: SOUTH KOREA: Gyeonggi-do: Mt. Cheonggyesan, 14.VII.1984, H.-Y. Han & K.-E. Ro, 2m, 4f; same data except 17.VII.1984, 1f. Gangwon-do: Wonju-si, Heungeop-myeon, Yonsei Univ. Campus, 28.VI.2004, H.-W. Byun, 1f; same data except 30.VI.2005, H.-W. Byun & H.-S. Lee, 1f; same data except 2.VII.2005, H.-W. Byun, 1f; same data except 5.VII.2005, 1m, 2f; same data except 6.VII.2005, 1m, 3f; same data except 8.VII.2005, 2f; same data except 10.VII.2005, 2f; same data except 13.VII.2005, 3f; same data except 14.VII.2005, 1f; same data except 16.VII.2005, 1m, 1f; same data except 29.VI.2006, 1f; same data except 3.VII.2006, S. Hwang et. al., 1f; same data except 7.VII.2006, J.-S. Lim, 1m. The above type series is deposited in YSUW.

Lateral and caudal views of epandrial complex and ventral view of sternite 5 in male.

Metadrinomyia flavifrons sp. nov. D–F. M. proclinata Shima. G –I. M. xanthokolos sp. nov. J–K. Lateral views of female postabdomen. J. M. flavifrons sp. nov. K. M. xanthokolos sp. nov.

Distribution. South Korea.

Etymology. The specific epithet is derived from the Latin ‘flavus’, meaning yellow, and ‘frons’, meaning brow, referring to the yellowish frons 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.