Sisyromyia umbra, 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 : 232-235

10. Sisyromyia umbra sp. nov.

( Figs 22 , 23 )

Type specimens. Holotype ♂ Australia, NSW, 28°24’S 153°16’E, Mt. Warning , 10 Oct 1992, R Eastwood ( AM: K542359 ).

Paratype ♂ (2), Australia, NSW, same data as holotype ( AM: K542360 - K542361 ) .

Other specimen examined. Australia, NSW, ♂ Mt. Tomah , Blue Mtns., 25 Aug 1973, NW Rodd ( AM: K542362 ) . ♀ Mt. Tomah , 5 Oct 1977 ( AM: K542363 ) . ♀ Clyde Mt nr Braidwood, 23 Sep 1952, SJ Paramonov ( ANIC) .

Diagnosis. Medium-sized fly, body with mostly brownish hairs. Wing membrane dark brown, slightly lighter towards posterior margin. Anterior margin of scutellum with a band consisting of short white scales.

Description. Male. Body length 8.0– 9.2 mm, wing length 9.6–9.9 mm.

Head. Head about 2.1 x wider than long, mostly blackish with thick pale pruinescence and covered in admixed white to black hairs and scales. Eyes holoptic. Frons short, 1.9 x length of ocellar tubercle, upper narrow and black; lower half triangular, 0.9 x length of upper half, with dense pale pruinescence and admixed golden and blackish brown hairs. Ocellar tubercle slightly raised, blackish brown to black with grey pruinescence, with long black hairs but golden basally. Face with thick grey pruinescence and golden scales admixed with some long black hairs, parafacial area with thick pale pruinescence and long pale yellow to white scales. Gena with thick pale pruinescence and long white hairs, admixed with few brown hairs. Clypeus with sparse grey pruinescence and otherwise bare. Occiput with sparse pale pruinescence and brown hairs admixed with black hairs. Posterior eye margin slightly convex. Antennal scape and pedicel blackish brown with sparse pale pruinescence, scape with long brown hairs admixed with few golden scales, pedicel with short brown hairs; flagellum black but turning brown apically, without pruinescence, subapex with 3 long hairs. Scape 2.6 x as long as wide, and 2.5 x as long as pedicel, uniform from base to apex. Pedicel 1.3 x as long as wide. Flagellum 7.0 x as long as wide, 1.9 x as long as scape + pedicel, 2.7 x as long as scape, conical and slightly laterally compressed, one-segmented with apical stylus ( Fig. 22c ). Palpus long, just extending beyond oral cavity, brown with white hairs, one-segmented, without palpal pit. Mouthparts slender, 3.2 x as long as eye length, 2.0 x as long as head length, labellum thin and filiform ( Fig. 22h ).

Thorax. Integumental colour of scutum mostly black with sparse pale pruinescence, pruinescence thicker laterally. Scutum covered with short brown hairs admixed with some short golden scales, hairs turning black apically, lateral stripe consisting of short white scales. Four brownish yellow notopleural setae present. Scutellum black with sparse pale pruinescence, anterior half with a band consisting of short white scales, posterior half with long brown to black hairs admixed with some golden scales. Pleura black with thick pale pruinescence, mostly covered in long pale yellow hairs, except dorsal half of anepisternum with brown hairs, anepimeron, meron, laterotergite and mediotergite bare.

Legs. Legs mostly dark yellow, tarsi turning brown in apical segments. Femora mostly covered in white hairs and scales, except anterior face of apical half with short yellow scales. Mid femur with two anterior bristles 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 2.0 x longer than fore basitarsus, mid tibia 2.4 x longer than mid basitarsus, hind tibia 2.2 x longer than hind basitarsus.

Wings. Wing membrane dark brown, slightly lighter towards posterior margin. 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 ( Fig. 22d ). Haltere stem brown, knob dark yellow.

Abdomen. Integumental colour of tergites black mostly with sparse pale pruinescence. Tergite 1 with thick pale pruinescence and dense brown hairs; tergites 2–7 with sparse brown scales admixed with long black hairs, hairs denser on posterior half, scales and hairs denser laterally; tergites 3–7 with median stripe consisting of dense, decumbent short golden scales. Sternites black except posterior margin yellow, with thick pale pruinescence, covered with white hairs admixed with few brown hairs. Genitalia. Epandrium anterior margin slightly concaved, posterior margin straight ( Fig. 23d ). Lateral margin of gonocoxite strongly curved ( Figs 23 ab); lateral ejaculatory process narrow; inner apex of gonocoxite short and narrow, outer apex of gonocoxite long and rounded; gap between inner apices of gonocoxites short and narrow; phallus shorter than gonocoxite ( Fig. 23c ).

Female. Body length 9.1–9.7 mm, wing length 10.1–12.9 mm. Very similar to male, except frons black with thick pale pruinescence, 3.2 x as wide as ocellar tubercle, frons with long brown to black hairs admixed with some short golden scales ( Fig. 22l ). Around 30 acanthophorite spines present on each side of tergite 9+10 ( Fig. 23g ).

Remarks. Sisyromyia umbra sp. nov. is similar to Sisyromyia rutila , but differs as follows: body with mostly brownish hairs; wing colour dark brown; anterior margin of scutellum with a band consisting of short white scales.

Etymology. The specific name refers to the dark wing colour.

Distribution. Australia (NSW).

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.