Microdon nigrodorsatum, Mutin, 2001

Mutin, V. A., 2001, New Data On The Taxonomy Of The Palaearctic Hover-Flies (Diptera, Syrphidae), Far Eastern Entomologist 99, pp. 19-20 : 19

Microdon nigrodorsatum sp. n.

TYPE MATERIAL. Holotype - ♂, Japan, Niigata-ken, Susagamine , 1200 m, Myokokogen, 26.VII 1993 (A. Lelej) [holotype is deposited in the Entomological Institute, Hokkaido University, Sapporo, Japan].

DESCRIPTION. MALE. Body length 12.1 mm, wing length 9.0 mm. Head: face black, weakly shiny, pale pilose; frons black, mainly with short black pile, minimal width/head width ratio - 1:5; vertex mainly densely pale pilose, with some shorter black pile on ocellar triangle. Antenna: scape shorter than pedicel and basoflagellomere combined; basoflagellomere 2 times as long as pedicel. Thorax: black, with weak blue-iron tinge, mainly pale pilose, with large spot of subapressed black pile on mid scutum; scutellum rather distinctly bifurcated apically, with a pair of long apical dents; wing weakly infuscated. Legs: pale pilose; coxae, trochanters and femorae black; tibiae yellow except apical half darkish anterodorsally; tarsi brownish dorsally. Abdomen: black, weakly shining; terga mainly with pale pilose; terga 3 and 4 more or less densely black pilose basally. Genitalia as in Fig. 1 . FEMALE unknown.

DISTRIBUTION. Japan: Honshu.

DIAGNOSIS. The new species is similar to West Palaearctic M. devius Linnaeus, 1758 but differs by darker legs (in M. devius tibiae and tarsi almost entirely yellow), by more extensive and denser black pilose of terga 3 and 4, by shape of epandrium theca and surstyli ( Fig. 1 vs. Fig. 2 ).

REMARKS. The comparison of European specimen of M. devius Linnaeus, 1758 with one recorded me from Japan [ 1] shows the considerable differences between them. New species differs distinctly from other Japanese Microdon species [ 2] by the pilose coloration of thoracic dorsum.

Figures

Figs 1-2. Male genitalia, lateral aspect: 1) Microdon nigrodorsatum; 2) M. devius.