Sisyromyia vittata, Li & Yeates, 2019

Li, Xuankun & Yeates, David K., 2019, Revision of the Australian bee fly genus Sisyromyia White, 1916 (Bombyliidae, Bombyliinae, Acrophthalmydini), Zootaxa 4711 (2), pp. 201-244 : 235-236

11. Sisyromyia vittata sp. nov.

( Figs 24 , 25 , 29b )

Type specimens. Holotype ♂ Australia, WA, -32.0607 116.5163, York, Leucopogon sp., 24 Aug 2018, J & F Hort ( WAM).

Paratype ♂ Australia, WA, same data as holotype .

Other specimen examined. Australia, WA, ♀ (2), -31.9823 116.5095 , York , Leucopogon sp., 8 Aug 2018, J & F Hort. ♂ (4), -32.0526 116.5435 , York , Leucopogon sp., 12 Aug 2018, J & F Hort. ♂ (1) ♀ (3), -32.0526 116.5435 ,

York, Leucopogon sp., 19 Aug 2018, J & F Hort. ♂ S31°31’ E115°42’, Nr. Parrot Ridge, 12 Sep 1982, MJ Smart . ♀ S31°31’ E115°42’, Nr. Parrot Ridge, 26 Sep 1982, MJ Smart

.

Diagnosis. Medium-sized fly, body with mostly yellow hairs. Wing membrane brown. Scutum with one dorsocentral stripe, abdominal tergites 2–6 with lateral stripe, stripes consist of sparse, decumbent golden scales. Inner apex of gonocoxite widely separated.

Description. Male. Body length 10.6 mm, wing length 12.5 mm.

Head. Head about 2.5 x wider than long, mostly blackish with thick pale pruinescence and covered in admixed pale yellow to golden scales and black hairs. Eyes dichoptic, narrowly separated by 0.9 x width of ocellus. Frons short, 1.3 x length of ocellar tubercle, upper narrow and black; lower half triangular, 3.3 x length of upper half, with sparse pale pruinescence and golden scales admixed with few black hairs. Ocellar tubercle slightly raised, blackish brown to black with sparse grey pruinescence, with long black hairs admixed with few golden hairs. Face with thick pale pruinescence and golden scales admixed with some long black hairs. Gena with thick pale pruinescence and long pale yellow hairs. Clypeus with thick pale pruinescence and otherwise bare. Occiput with thick pale pruinescence and golden scales, admixed with few black hairs. Posterior eye margin slightly convex. Antennal scape and pedicel black with thick pale pruinescence, scape with long black hairs admixed with golden scales laterally, pedicel with short black hairs; [flagellum broken]. Palpus long, just extending beyond oral cavity, brown except apex black, with brown hairs admixed with few black hairs, one-segmented, without palpal pit. Mouthparts slender, 4.0 x as long as eye length, 2.2 x as long as head length, labellum thin and filiform ( Fig. 24e ).

Thorax. Integumental colour of scutum mostly black with sparse pale pruinescence except postalar callus brown. Scutum covered with yellow hairs, admixed with some short black hairs; with one dorsocentral stripe and one lateral marginal stripe consisting of dense, decumbent short golden scales. Four brownish yellow notopleural setae present. Scutellum brown with sparse pale pruinescence, with short golden scales and long golden hairs, admixed with some long black hairs, black hairs denser posteriorly. Pleura black with thick pale pruinescence, mostly covered in long pale yellow hairs, except anepisternum with golden hairs admixed with some black hairs, anepimeron, meron, laterotergite and mediotergite bare.

Legs. Legs mostly brown, except femora black basally. Femora with golden and black hairs, black hairs denser on anterior face and apical half. Mid femur with one anterior bristle on apical half; hind femur with one row of anteroventral bristles and more separate bristles on apical half. Bristles and other hairs on legs brown. Fore tibia 2.3 x longer than fore basitarsus, mid tibia 2.7 x longer than mid basitarsus, hind tibia 2.3 x longer than hind basitarsus.

Wings. Wing membrane brown, with darker towards wing base. Cell r 5 open, M 1 close to R 5; cell br nearly as long as cell bm, crossvein r-m arising from base of cell dm; crossvein m-m nearly as long as crossvein r-m; cell cup open. Haltere stem yellow, knob pale yellow.

Abdomen. Integumental colour of tergites black mostly with sparse pale pruinescence. Tergite 1 with thick pale pruinescence and dense golden hairs, admixed with few black hairs laterally; tergite 2 with long golden hairs on anterior half and laterally, and with long black hairs on posterior half; tergites 2–7 with sparse long black hairs and dense long golden hairs laterally; tergites 2–6 with lateral stripe consisting of sparse, decumbent golden scales; tergites 2–7 with median stripe consisting of dense, decumbent short white scales. Sternites black except posterior half yellow, with thick pale pruinescence, covered with golden hairs. Genitalia. Epandrium anterior margin slightly concave, posterior margin straight ( Fig. 25d ). Lateral margin of gonocoxite nearly straight ( Figs 25 ab); lateral ejaculatory process wide; inner and outer apices of gonocoxite long and acute; gap between inner apices of gonocoxites wide; phallus shorter than gonocoxite ( Fig. 25c ).

Female. Body length 9.8 mm, wing length 11.9 mm. Very similar to male, except frons black with thick pale pruinescence, 3.0 x as wide as ocellar tubercle, frons with short golden scales admixed with long black hairs ( Fig. 22l ). Flagellum black but turning brown apically, without pruinescence, subapex with 5 long hairs. Scape 2.0 x as long as wide, and 2.0 x as long as pedicel, uniform from base to apex. Pedicel 1.2 x as long as wide. Flagellum 12.0 x as long as wide, 2.4 x as long as scape + pedicel, 3.4 x as long as scape, conical and slightly laterally compressed, one-segmented with apical stylus ( Fig. 22j ). Around 20 acanthophorite spines present on each side of tergite 9+10 ( Fig. 23g ).

Remarks. Sisyromyia vittata sp. nov. is similar to Sisyromyia rutila , but differs in having smaller body-size, the scutum and abdomen with golden stripes, and the inner apex of gonocoxite widely separated.

Etymology. The specific name refers to the scutum and abdomen with golden stripes.

Distribution. Australia (WA).

Figures

FIGURE 22. Sisyromyia umbra sp. nov. External (a–i (♂); j–o (♀)): (a, j) dorsal; (b, k) lateral; (c) antenna, lateral; (d) wing; (e, l) head, dorsal; (f, m) head, frontal; (g, n) head, profile; (h, o) head, lateral; (i) abdomen, dorsal. Scale bars = 1 mm (a, b, d–o); = 0.1 mm (c).

FIGURE 23. Sisyromyia umbra sp. nov. Genitalia (a–e (♂); f, g (♀)): (a) genitalic capsule, dorsal; (b) genitalic capsule, ventral; (c) genitalic capsule, lateral; (d) epandrium, dorsal; (e) epandrium, lateral; (f) sternite 8, ventral; (g) genitalia and spermathecae. Scale bars = 0.1 mm.

FIGURE 24. Sisyromyia vittata sp. nov. External (a–g (♂); h–o (♀)): (a, h) dorsal; (b, i) lateral; (c, l) head, dorsal; (d, m) head, frontal; (e, n) head, profile; (f, o) head, lateral; (g) abdomen, dorsal; (j) antenna, lateral; (k) wing. Scale bars = 1 mm (a–i, k–o); = 0.1 mm (j).

FIGURE 25. Sisyromyia vittata sp. nov. Genitalia (a–e (♂); f, g (♀)): (a) genitalic capsule, dorsal; (b) genitalic capsule, ventral; (c) genitalic capsule, lateral; (d) epandrium, dorsal; (e) epandrium, lateral; (f) sternite 8, ventral; (g) genitalia and spermathecae. Scale bars = 0.1 mm.

FIGURE 29. Sisyromyia females visiting Leucopogon sp. flowers from WA. (a) Sisyromyia thomsoni Evenhuis & Greathead; (b) Sisyromyia vittata sp. nov. Photograph by Jean and Fred Hort.