Megatrigon ochreatus ( Hull, 1964 ) Doczkal & Radenković & Lyneborg & Pape, 2016

Doczkal, Dieter, Radenković, Snežana, Lyneborg, Leif & Pape, Thomas, 2016, Taxonomic revision of the Afrotropical genus Megatrigon Johnson, 1898 (Diptera: Syrphidae), European Journal of Taxonomy 238, pp. 1-36 : 27-28

publication ID	https://doi.org/ 10.5852/ejt.2016.238
DOI	https://doi.org/10.5281/zenodo.3854672
persistent identifier	https://treatment.plazi.org/id/03EA327E-FFFB-EC0C-FD99-EBCCFB4CFEAB
treatment provided by	Valdenar
scientific name	Megatrigon ochreatus ( Hull, 1964 )
status	comb. nov.

Treatment

Megatrigon ochreatus ( Hull, 1964) comb. nov.

Figs 1J View Fig , 2K View Fig , 3J View Fig , 7J View Fig , 10J View Fig , 11J View Fig , 12I View Fig , 16 View Fig

Eumerus ochreatus Hull, 1964: 493 View in CoL . South Africa, Eastern Cape, Katberg.

Diagnosis

Frons and vertex shiny ( Fig. 2K View Fig ), almost without microtrichia (like in M. immaculatus sp. nov., M. magnicornis sp. nov. and M. tabanoides sp. nov.); tergites 2–4 with pairs of white microtrichiose fasciae, covered by yellow setae ( Fig. 7J View Fig ): tergite 2 with two small spots at posterolateral corners and indistinct microtrichia anteromedially, tergite 3 with two short, widely separated, postero-lateral stripes reaching lateral margins and tergite 4 with two large stripes tapering and almost connected in the middle, but not reaching lateral margins.

Type material

Holotype

SOUTH AFRICA: ♁, Eastern Cape, Katberg , 1–10 Feb. 1933, R.E. Turner leg. ( BMNH).

Paratypes

SOUTH AFRICA: 1 ♁, KwaZulu-Natal, Royal Natal Nat. Park, 18 Mar. 1989, J.G.H. Londt leg. ( NMSA); 1 ♁, Western Cape, Worcester Karoo Gardens, 17 Oct. 1970, H.V. Daly leg. ( CAS).

Description

LENGTH. Body 10.0 mm, wing 7.5 mm.

HEAD ( Figs 2K View Fig , 3J View Fig ). Face largely microtrichiose: microtrichiose stripes along eye margins long, wide, especially at the level below antennae where joined median facial stripe and narrow oblique stripe; face and gena wider than in M. argenteus comb. nov., gena 1.5 × as wide as postpedicel (in M. argenteus comb. nov. gena and postpedicel of equal width); distance between eyes larger than in M. argenteus comb. nov., 0.19 × width of head; postocular orbit wider than in M. argenteus comb. nov., the width of postocular orbit dorsally 0.13 × width of head; postpedicel longer than in M. argenteus comb. nov., 1.7 × as long as deep; 1.7 × as long as pedicel; ocellar triangle equilateral without median longitudinal groove.

THORAX. Mesoscutum with lateral microtrichiose stripes and traces of prescutellar microtrichia; supraalar setae yellow; mediotergite mostly covered with microtrichia.

WING. Membrane irregulary yellow-brown infuscated, densely covered with microtrichia that is mainly yellow-brown, except white microtrichia along the posterior edge and wing base; costagium with yellow setae.

LEGS. Setae yellow; all tarsi yellow, metatibia almost entirely dark, with white microtrichia in proximal half dorsally that reach the scar.

ABDOMEN ( Figs 1J View Fig , 7J View Fig ). Narrower than in M. argenteus comb. nov. (tergite 3 is 1.8 × as wide as long); tergites yellow setose, except black short hairs in posterior part of tergite 2, anterior and posterior 0.33 of tergite 3, and anteriorly of tergite 4. Male genitalia in Figs 10J View Fig , 11J View Fig , 12I View Fig .