Stuckenbergomyia tumbinensis (Smith, 1969)

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 tumbinensis (Smith, 1969) Figs 15-16, 17-18, 22

Stuckenbergia tumbinensis Smith, 1969: 126. Type locality: Tumbine Mountains, Mozambique.

Stuckenbergomyia tumbinensis : Smith, 1980: 436 (catalogue).

Diagnosis.

This species is characterised by the biserial acrostichals and uniserial dorsocentral setae; narrow wings with undeveloped alula and 2 pairs of long scutellar setae; male terminalia: very large, symmetrical, held erect over right side of abdomen.

Redescription.

Head: Dichoptic with facets not enlarged. Antenna with scape and pedicel paler than dark brown postpedicel; postpedicel length slightly longer than 4 × basal width; stylus cylindrical, about as long as basal width of postpedicel; apical mechanoreceptor one-half length of stylus.

Thorax: Mostly dark with thin greyish pruinescence. Scutum with narrow brownish vittae between acrostichals and dorsocentral rows (viewed posteriorly). Acrostichals biserial; dorsocentral setae uniserial, longer, darker posteriorly; postpronotal setae numerous, long and pale; numerous pale presutural and postsutural supra-alar setae; 3 pale notopleural setae; 1 pale postalar seta; 2 pairs of pale scutellar setae, longer than length of scutellum. Proepisternum with several long, pale setae.

Legs: Yellowish-brown; femora darkened about middle; tibia and tarsi darker; basal half of tarsomere 1 yellowish (Fig. 17).

Wing (3-3.2 mm): Narrow, anal lobe obtuse, not sharply angled; alula undeveloped. Costal margin at humeral crossvein not expanded; costa gradually reduced beyond M1; spur vein arising from between cells bm and cua. Halter knob pale.

Abdomen: Dark brown, concolorous with thorax; setae pale; tergite 8 narrow medially, expanded laterally, bearing 3 setae.

Male terminalia (Figs 15, 16): Very large, symmetrical, held erect over right side of abdomen, as long as half shrunken abdomen; rotated 45° to right. Cercus thinly sclerotised, weakly pigmented, clothed in slender setae, rounded apically; hypoproct broad with fine setae on posterior margin. Epandrial lamellae narrowed anteriorly, with row of setae on posterior margin, prolonged posteriorly, tapered into slender, medially arched extension; surstylus subapical, not articulated, strongly sclerotised and pigmented, arched medially. Postgonite forming phallic sheath, with short, triangular process apicolaterally; ventral apodeme absent? Ejaculatory apodeme elongate, narrow. Phallus membranous apically, expanded with pair of dorsal rods.

Female.

Unknown.

Type locality.

Mozambique: Zambezia Province, Milange, Tumbine Mountain [16°2'36"S, 36°47'41"E] (Fig. 22).

Type material examined.

Holotype ♂, labelled (Fig. 18): "TUMBINE / MILANGE/ PORT EAST AFRICA [Mozambique]/ JULY 1957/ B. & P. Stuckenberg"; "HOLOTYPE ♂/ Stuckenbergia / tumbinensis / K.G.V.SMITH"; " NMSA-DIP-71787" (NMSA) (Fig. 17).

Paratypes: MOZAMBIQUE: 2♂, same data as holotype, NMSA-DIP-71786, NMSA-DIP-09435 (NMSA).