Sphegina (Asiosphegina) achaeta Hippa, van Steenis &Mutin, 2015

Steenis, Jeroen Van, Hippa, Heikki & Mutin, Valeri A., 2018, Revision of the Oriental species of the genus Sphegina Meigen, 1822 (Diptera: Syrphidae), European Journal of Taxonomy 489, pp. 1-198 : 27-29

Sphegina (Asiosphegina) achaeta Hippa, van Steenis &Mutin, 2015

Figs 6 A–B, 13A

Sphegina (Asiosphegina) achaeta Hippa, van Steenis & Mutin, 2015: 58 . Type locality: Kambaiti, Myanmar (holotype, ♂, NHRS).

Material examined

MYANMAR • 1 ♀; “ N. E. Burma / Kambaiti, 7000 ft. / 7. v. 1934 / [leg] R. Malaise ” • 1 ♀; “ N. E. Burma / Kambaiti 7000 ft. / 14.5.1934 [leg] Malaise ”; NHM • 1 ♀; same data as for preceding; JSA • 1 ♀; “ N. E. Burma / Kambaiti, 7000 ft. / 9.6.1934 [leg] Malaise ”; JSA • 1 ♀; “ N. E. Burma, / Kambaiti, 2000 m. / 11.5.1934 [leg] Malaise ”; NHRS • 1 ♀; “ N. E. Burma / Kambaiti, 2000 m. / 12.5.1934 [leg] Malaise ”; JSA .

Description

Female

LENGTH. Body 6.1–7.2 mm, wing 5.5–6.3 mm.

HEAD. Face in lateral view concave, strongly projected antero-ventrally; frontal prominence strongly developed. Ratio width of vertex at anterior ocellus: width of head 1: 3.5–3.7; ratio width of ocellar triangle: width of vertex 1: 2.3–2.5; ratio length of ocellar triangle: length of frons 1: 3.5–4.2. Face dark brown; grey pollinose, long pilose along eye-margin. Hypostomal bridge black, long pale pilose. Gena and mouth edge dark brown with large subtriangular non-pollinose shiny area. Frons and vertex black, slightly pollinose, except anterior half of frons non-pollinose and shiny; pile short, light yellow. Frons with wide circular depression medially. Occiput black, light grey pollinose, light yellow pilose. Antenna dark brown with black setae dorsally on scape and pedicel; basoflagellomere short-oval, ratio width: length 1: 1.1; arista pilose, slightly more than 2.5 times as long as basoflagellomere.

THORAX. Colour dark brown to black, postpronotum red-brown; weakly brown pollinose with four grey pollinose vitta on entire scutum, pleuron entirely grey pollinose; scutum and pleuron with very short appressed light yellow pile. Scutellum semi-circular, black, brown pollinose, pile slightly longer than on scutum, with two widely set setae of medium length, ratio length of scutellum: length of seta 1: 1.5–1.7.

WING. Entirely microtrichose; hyaline, stigma yellowish. Crossvein dm-cu meeting vein M obliquely and vein M

1

meeting vein R

4+5

perpendicularly.

LEGS. Pro- and mesoleg with femora and tibiae dark brown to black on apical ⅔ to ¾; tarsi with tarsomeres 2–5 black. Metaleg with coxa dark brown, trochanter yellow; femur black with basal ¼ yellow, incrassate, ratio width: length 1: 3.4–3.6; tibia black and yellow biannulate, without apicoventral dens; tarsus entirely black, basitarsomere thin, ratio width: length 1: 3.8.

ABDOMEN. Length ratio of terga I: II: III: IV: V 1: 2.4–3.5: 1.8–2.4: 2.4–2.8: 0.5–0.9; ratio width at posterior margin: medial length of tergum II and III 1: 1.2–1.8 and 1: 0.6. Terga black, tergum II with sub-anterior light-brown fascia, anterior ⅓ of tergum III with yellow fascia; pile short, light yellow; tergum I, Fig. 8A with oblique row of 5 white and weak setae at lateral margin; sternum III rectangular, ratio width: length 1: 1.3–1.4; sternum IV trapezoidal, ratio width: length 1: 0.6–0.7 and sternum V trapezoidal with widest part anteriorly, ratio width: length 1: 0.7.

Remarks

Only known by the type material from Myanmar, Kambaiti ( Hippa et al. 2015) and the female specimens studied here from the same locality.

Figures

Fig. 6. Habitus, lateral view. A. Sphegina (Asiosphegina) achaeta Hippa, van Steenis & Mutin, 2015, holotype, Ƌ, Myanmar. B. S. (A.) achaeta, ♀, Myanmar. C. S. (A.) albolobata sp. nov., holotype, Ƌ, Vietnam. D. S. (A.) amplistylus sp. nov., holotype, Ƌ, Philippines. E. S. (A.) apicalis Shiraki, 1930, Ƌ, Taiwan. F. S. (A.) apicalis, ♀, Taiwan. Scale bars = 1.0 mm.

Fig. 8. Sphegina (Asiosphegina) amplistylus sp. nov., holotype, Ƌ. A. Sternum IV, ventral view. B. Left surstylus, lateral view. C. Left superior lobe, lateral view. D. Genitalia, right side, lateral view. Scale bars = 0.5 mm.