Myolepta shikokuana Shiraki, 1968

Steenis, Jeroen Van, 2020, A new species of the genus Myolepta Newman (Diptera: Syrphidae), with short description and key to all species of the M. vara subgroup, Zootaxa 4750 (3), pp. 370-390 : 380-382

Myolepta shikokuana Shiraki, 1968

Figs 2 C−D, 10D, 11C, 12A−B, 13C, 14C, 16C

Myolepta shikokuana Shiraki, 1968: 37 ; the type is deposited in NIAS

Material examined. HOLOTYPE ♂, Japan: V.10.1951, Samachi, Tokushima, leg T. Shiraki. ( Photos on http:syrphidae.a.la9.jp/index.html studied here); “ JP Fukui pref. 800 m. / lat 35.413 lng 135.813 / 18 V 2016 leg. S. Bot ”,

1♂ ( SBH); same data as previous except “ 19 V 2016 ”, “ Myolepta sub-group / fig no JvSMo1-004” , 1♂ ( JSA); “ JP Iwate pref. / Kuzumaki 522 m. / lat 40.049 lng 141.395 / 29 V 2016 leg. S. Bot ”, “ Myolepta sub-group / fig no JvSMo1-011” , 1♂ ( SBH) .

Short description. Face whitish-grey pollinose except for non-pollinose shiny black tubercle in male. Mesonotum with dense, short, erect light-yellow and on posterior half shorter sub appressed black pile, on humerus, notopleuron and along posterior margin slightly longer and more brownish-yellow; anterior margin of scutum broadly grey-pollinose with antero-medially a short but broad vitta; pleura more or less entirely grey pollinose except non-pollinose and shiny on antero-ventral corner of anepisternum, on antero-dorsal part of katepisternum and large medial part of meron; scutellum with long whitish pile. Mesofemur with rather long whitish pile, longest ventral pile about 3/4 as long as width of metafemur. Terga II and III medially short appressed black pilose, along lateral margin with long whitish pile; tergum IV on anterior half with erect black pile and on posterior half with appressed longer whitish pile; tergum I entirely and densely grey pollinose; tergum II antero-medially with weak grey-pollinose vitta; sterna rather densely and entirely grey-brown pollinose. Genitalia ( Figs 12 A−B): surstylus almost round, with widely rounded apex and convex ventral and dorsal margin, with some long pile baso-dorsally; hypandrium at apico-dorsal corner with short triangular extension, in ventral view basally rounded with round medio-lateral corners, apical part only slightly narrower; superior lobe with wide triangular extension dorsally, with narrow incision apico-ventrally, apico-dorsal corner rounded and widely extended apico-dorsally. Body length (only male) 10.3–11.9 mm, wing length 7.8–9.5 mm.

Remarks. The description and photos of the holotype give enough evidence that the specimens studied here belong to M. shikokuana .

Distribution. Only known from Japan from the here-studied specimens and furthermore from the provinces Ibaraki, Kanagawa and Tokushima ( Shiraki 1968; Ichige 2016; Ijima 2017).

Figures

FIGURE 2. Adult habitus of Myolepta hoverflies, male; A, C, E. dorsal view; B, D, F. lateral view. A, B. Myolepta obscura, Paris, France, fig no JvSMo1-003. C, D. Myolepta shikokuana, Fukui pref., Japan, fig no JvSMo1-004. E, F. Myolepta vara, Mechelen, the Netherlands, fig no JvSMo1-005. Scale 1.0 mm.

FIGURE 12. Male genitalia of Myolepta shikokuana, fig no JvSMo1-011. A. lateral view. B. hypandrium, ventral view. Scale 0.5 mm.