Stuckenbergomyia species A

Sinclair, Bradley J., 2019, Revision of the southern African genus Stuckenbergomyia Smith, 1971 (Diptera, Empidoidea) and proposal of a new subfamily, African Invertebrates 60 (1), pp. 133-145 : 133

Stuckenbergomyia species A Figs 20-21, 22

Diagnosis.

This species is characterised by a narrow pair of vittae between acrostichals and dorsocentrals and broader brown vittae along supra-alars; broad wings and 7 pairs of whitish scutellar setae.

Description.

Head: Dichoptic without enlarged facets. Frons parallel-sided with dense grey pruinescence; brownish stripe medially; ocellar triangle blacking. Antenna with scape and pedicel paler than dark brown postpedicel; postpedicel length less than 4 × basal width; stylus cylindrical, shorter than basal width of postpedicel; apical mechanoreceptor one-third length of stylus.

Thorax: Dense grey pruinescence. Scutum with pair of narrow dark brown vittae between acrostichals and dorsocentral rows (viewed anteriorly) (Fig. 21); broader brown stripe extending along supra-alar region; anterior margin of postpronotal lobe shiny, lacking pruinescence; prescutellar depression with light brown stripe medially. Chaetotaxy whitish; acrostichals multi-serial anteriorly, biserial on prescutellar depression; dorsocentral setae multi-serial and short anteriorly, longer and 4-serial at prescutellar depression; postpronotal setae numerous and long; numerous presutural and postsutural supra-alar setae; 3-4 notopleural setae; 1 postalar seta; 7 pairs of scutellar setae, slightly longer than length of scutellum. Proepisternum with several pale setae.

Legs: Brown, apex of femora, base of tibiae and proximal half of tarsomere 1 yellowish; apical tarsomeres increasingly darker (Fig. 20).

Wing (2.6-3 mm): Broad, anal lobe nearly right-angled; alula well-developed. Costal margin at humeral crossvein expanded, costal cell broad; costa gradually reduced beyond M1; spur vein arising from cell bm. Halter knob pale.

Abdomen: Brown with thin grey pruinescence; setae pale. Female terminalia (undissected): Cercus short, truncate; hypoproct paler than cercus.

Male.

Unknown.

Material examined.

SOUTH AFRICA: 2♀, [Northern Cape], Farm Glenlyon, Camel Koppie, MT, 781 m elev., 31.41324°S 19.15802°E [31°24'47.664"S 19°9'28.872"E], 3-24.x.2005, J. Schmidt, leg. (CNC) (Fig. 22).

Remarks.

Formal naming of this species should await association of male specimens.