Strongylophthalmyia bukittinggiana

Galinskaya, Tatiana V. & Shatalkin, Anatoly I., 2018, Seven new species of Strongylophthalmyia Heller, 1902 (Diptera: Strongylophthalmyiidae) from the Eastern Palaearctic and Oriental Regions with notes on peculiar rare species, Zootaxa 4402 (1), pp. 113-135: 119-120

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Strongylophthalmyia bukittinggiana

n. sp.

Strongylophthalmyia bukittinggiana  , n. sp.

( Figs. 4View FIGURE 4, 5View FIGURE 5)

Material examined. Holotype: ♂, Fort de Kock (Sumatra), 920 m, 1925, leg. E.Jacobson  . Paratypes: 1 ♂, 3 ♀, same locality as holotype ( NBCN)  .

Diagnosis. This new species can be distinguished by the following combination of characters. Male antennal flagellomere unmodified, without dorsal process; fore femur without dorsal spicules, although stiff setulae may be present. Palpus bicoloured. Mesonotum black. Postpronotum black. Frons entirely black. Arista dark brown, bare. Femora yellow, hind femur with wide brownish darkening. Hind tibia brownish with median one third yellowish. Wing unpigmented. Two dorsocentral setae. Large species, body length 4.0– 4.4 mm.

The two other species of the genus with a bicoloured palpus, S. indica Shatalkin, 1996  and S. dichroa Galinskaya & Shatalkin, 2016  , are distinguished from S. bukittinggiana  , n. sp. by short yellow setulae covering the mesonotum and by a single dorsocentral seta. Strongylophthalmyia indica  further differs in having the frons yellow anteriorly and the coxae are entirely yellow. The hind tibia of S. dichroa  has a slight darkening in the basal half. Strongylophthalmyia bukittinggiana  has a long saber-shaped postpronotal seta ( Figs 4bView FIGURE 4, 5b,dView FIGURE 5), and the hind trochanter with yellow lamellar projection bearing thick setae and setulae in both sexes is unique to this species.

Description. Male ( Fig. 4View FIGURE 4). Head black, slightly shorter than high; frons entirely black, shining, slightly widened towards vertex, its anterior width about 0.8 times as long as its width at level of fore ocellus, its height (up to hind ocelli) about 0.9 times as great as its anterior width; frontal index = 1. Occiput black, weakly convex (seen from above). Face brownish, with row of short setulae along suture. Gena yellow with whitish pubescence. Antenna yellow, flagellomere dark brown with yellowish tint, paler on inner-basal margin; flagellomere small, 0.2 times as wide as eye height; flagellomere 0.67 times as long as its width; marginal setulae of flagellomere pale and moderately long. Arista dark brown, bare. Palpus elongate, yellow basally and blackish in apical half. Mouthparts dark brown. Frons between upper orbital and outer vertical setae without short setulae. Three reclinate frontoorbital setae (middle one longest), one ocellar, one postocellar, one inner vertical, one outer vertical.

Thorax black. Mesonotum slightly matte, with very thin punctation and with setulae arranged in lines; scutellum matte. Postpronotum with long (0.2 mm) strongly bent seta ( Fig. 4bView FIGURE 4). One dorsocentral, two notopleural setae, one supraalar seta, one postalar seta, one anepisternal seta, one thick apical scutellar seta.

Legs yellow; hind coxa brownish, hind femur with apical quarter brown; hind tibia brownish with medial third yellowish. Hind trochanter with yellow lamellar projection bearing thick setae and setulae. Hind femur basally with mushroom-shaped process bearing 3 short setulae apically.

Wing unpigmented, with faint darkening apically. Vein R2+3 long: costal index = 1.6. R4+5 and M1+2 almost parallel apically. Discal index = 2.5, medial index = 0.67. Cell bm about 0.43 times as long as cell dm. Calypter light yellow with fan of very long yellowish setulae on margin. Halter with darkish stem and whitish knob.

Abdomen black, slightly shining.

Lengths. Body, 4.2 mm; wing, 3.2 mm (holotype). Body, 4.4 mm; wing, 3.5 mm (paratype).

Female ( Fig. 5View FIGURE 5) differs from male in the first flagellomere paler apically, palpus dark brown, and length of postpronotal seta 0.26. Abdominal tergite 5 is arcuate posteriorly and bears one pair of larger setae laterally. Postpronotum bears a long saber-shaped seta ( Fig. 5b, dView FIGURE 5), but hind trochanter and hind femur without peculiar processes and setae. Body length 4.2–4.4 mm; wing length 3.6–3.9 mm.

Distribution. Indonesia (Sumatra).

Etymology. The specific epithet refers to the modern name of the type locality – the Bukittinggi city.