Gymnochiromyia setulosa sp. n.

Figs 2c, 23

Etymology: From Latin setulae, diminutive of setae (bristles); after the more than usual numerous setulae.

Diagnosis: A completely yellow species very similar to gilva, and also with a dark brown spot on the ep; acrs shorter and in 8 irregular rows; generally paler setae and setulae; frons narrowing more markedly at level of antennae.

Description:

Male.

Head:All yellow; oc triangle yellow with oc ringed black; fr narrow, at level of antennae 0.45 width of that at level of anterior oc. ocp in profile just visible behind eye, with short postocular setulae in one irregular row; isolated lower post-genal seta distinct, pale almost white. Gena narrower in front than behind; below middle of eye it is about 0.9 height of eye, yellow with pale golden yellow setulae. Mouthparts small, all yellow; setulae of oral margin relatively short except for one long seta just below vibrissal angle. Face depressed and poorly sclerotised. Antenna yellow, second segment paler than third, with distinct pale seta dorsally; third segment round, finely white pubescent: pubescence very short; arista with black second segment and yellow first two segments. Chaetotaxy: 3 strong orbs, anterior inclinate, middle and posterior orb reclinate, all more or less equidistant from each other and with a few fine setulae on orb plate between them; in addition, about 30 fine pale setulae scattered on fr; pvt distinct and crossed; 1 vti and 1 vte; oc as long as hind orb, proclinate and lateroclinate. Setae of fr and vertex yellow.

Thorax: Entirely yellow; msn darker yellow but without stripes, rather densely short setulose. Chaetotaxy: 2 hu, one long and one short, 1 psthu, 2 ntpl, 1 sa, 1 pa, 2 dc, acrs in 8–10 irregular rows at transverse suture increasing in number posteriorly, prescutellar distinct; 1 mspl, 1 stpl, both with pale setulae in front.

Wing: Hyaline, veins yellow, distance on costal margin between R 2+3 to R 4+5 is 0.6 that between R 4+5 and M 1+2; distance between crossveins about equal to length of apical section of Cu. Haltere yellow.

Legs: Not modified except for slightly thicker femora; pale yellow setae and setulae scattered on all pairs of legs.

Abdomen: All tg and st yellow and with yellow setae and setulae, the longest on lateral aspect of tg about 3/4 length of tg.

Postabdomen: ep slightly elongated, cerci pale and finely setulose; surs short and pale with rounded apex, hyp small, ph apd narrow and short, ej apd distinct, prg small and round, finely setulose, psg small and sinuous, ph large and asymmetrical, bac scl not identified.

Female. Similar to male but without secondary sexual characters.

Length: ♂ 1.7 mm, wing 1.6 mm, ♀2.0 mm, wing 1.9 mm.

Variation: None noted.

Holotype: ♂ SOUTH AFRICA: Gauteng: Pretoria, Hartbeespoort, 25 km W Pretoria, 30.xii.1994, A. Freidberg (NMSA, 1177).

Paratypes: SOUTH AFRICA: Gauteng: 1 ♂ same data as holotype (NMC); 1 ♂ same data (TAU). Eastern Cape: 1♀7 km N Steytlerville, Groot R., 3324AB, 30.x.1978, lucerne field, R.M. Miller (NMSA); 1♀same data (TAU).