Sphegina (Asiosphegina) furva, Hippa, Heikki, Steenis, Jeroen Van & Mutin, Valeri A., 2015

Hippa, Heikki, Steenis, Jeroen Van & Mutin, Valeri A., 2015, The genus Sphegina Meigen (Diptera, Syrphidae) in a biodiversity hotspot: the thirty-six sympatric species in Kambaiti, Myanmar, Zootaxa 3954 (1), pp. 1-67 : 58

Sphegina (Asiosphegina) furva sp. n.

Figs 2 B, 36A–E

MALE. Body length 6.5–7.7 mm, wing length 6.0– 6.5 mm. Head. Face strongly concave and weakly projected antero-ventrally; frontal prominence weakly developed (similar to Fig. 1F). Width of vertex at anterior ocellus ca. 1/5 of the width of head [1:4.8]; depth of occipital fossa 1/5 of the width of an eye in dorsal view. Width of face:width of head 1:4.4. Face black, densely pale pollinose, weakly medio-ventrally. Gena shiny brownish. Frons and vertex black, pale pollinose, frontal prominence posteriorly with diffuse fascia of dense pollinosity, otherwise shiny; lunula shiny brown; the pile short, erect and pale. Occiput dull black. Antenna dark brown, basoflagellomere oval, extreme base reddish; arista pilose. Eye with an area of enlarged facets at anterior margin. Thorax. Colour black, densely pale pollinose on pleura; scutum with a medial and sublateral semi-shiny fascia or almost uniformly weakly pollinose, the pile adpressed and usually reddish; scutellum semicircular (ratio of length:width 1:2.7), semishiny, with adpressed brownish pile; a pair of long black setae at apical margin, rather widely separated. Wing, Fig. 2 B. Hyaline, stigma brownish. Legs. Pro- and mesoleg: coxa yellow; trochanter yellow, femur brownish, the extreme base and apex yellowish; tibia yellow with a more or less broad brownish annulus on apical 1/2; tarsus yellow, tarsomeres 4 and 5 black. Metaleg: coxa black; trochanter simple, yellow or brownish; femur blackish, the basal 1/6 yellow; tibia without distinct apico-ventral tooth, yellow, the apical 1/3 to 1/4 brown and a brownish annulus medially; tarsus black. Abdomen. Length ratio of tergites I, II, III and IV 1:3.3:1.7:1.3. Colour of tergites shiny black, tergite III on anterior 1/2 with an obscure reddish fascia broadening laterally; the pile pale, short and adpressed, becoming longer laterally; tergite I with an oblique row of 4–5 long, pale setae laterally; sternite IV ( Figs 36 A, B) brown, with fine dense pale pile: sternite VI ( Fig. 36 A) simple, black, with an area of long pale pile; sternites VII and VIII black, with pale pile. Genitalia, Figs 36 C–E. Note the strongly asymmetrical surstyli, the only slightly asymmetrical superior lobes, the strongly asymmetrical postero-ventral part of sternite IX, the elongated tergite IX, and the narrow cercus. FEMALE. Unknown.

Type material. HOLOTYPE. ♂, N.E. Burma, Kambaiti, 7000 ft., 7.vi.1934, R. Malaise ( BMNH). PARATYPES. 1♂ with same data as holotype except 1.v. ( BMNH); 1♂ with same data except 16.v. ( SMNH); 1♂ with same data except 20.v. ( NBC); 1♂ with same data except 2.vi. ( NBC); 1♂ with same data except 2000 m., 17.v. ( SMNH); 1♂ with same data except 2000 m., 24.v. ( NBC).

Etymology. The name is Latin, furva , dusky or black, referring to the general dark colour of the fly.

Discussion. Sphegina furva is similar to S. atricolor . For further discussion see under the latter species.

Figures

FIGURE 2. Wing. A. Sphegina (Sphegina) uncinata sp. n. (paratype). B. S. (Asiosphegina) furva sp. n. (paratype). C. S. (A.) nasuta sp. n. (paratype). D. S. (A.) crucivena sp. n. (paratype). E. S. (A.) crassispina sp. n. (paratype). F. S. (A.) bidens sp. n. (paratype). G. S. (A.) carinata sp. n. (paratype). H. S. (A.) index sp. n. (paratype). I. S. (A.) simplex sp. n. (paratype). Scale 0.5 mm.

FIGURE 36. Sphegina (Asiosphegina) furva sp. n. (holotype). A. Last abdominal segments, lateral view. B. Sternite IV, ventral view. C. Genitalia, lateral view. D. Left surstylus, lateral view. E. Left superior lobe, lateral view. Scale 0.5 mm.