Xestomyza Wiedemann, 1820

Hauser, Martin, 2012, A new species of Xestomyza Wiedemann, 1820 from South Africa, with a key to the genera of Xestomyzinae (Diptera: Therevidae), African Invertebrates 53 (1), pp. 175-175 : 184

Key to the species of Xestomyza Wiedemann

1 Frons ( Figs 3, 4 , 9, 10 ) (and rest of body, Figs 1–4 ) entirely or predominantly shiny black; male body appears bi­coloured: thorax with predominantly black long erect setae and some white setae intermixed, abdomen mainly with reddish golden long erect setae; larger species ≥ 8 mm (8–11.2 mm) ................... lugubris Wiedemann

– Frons ( Figs 7, 8 , 12 ) (and all or most of body, Figs 5–8 ) entirely covered in grey pubescence; abdomen with short semi-appressed setae; male body appears concolourous, grey with sparse black setae; smaller species <7 mm (5.2–6.4 mm)......2

2 Scape>3× as long as flagellomeres combined ( Figs 12 , 20 ); flagellomere 1 roundish, nearly as broad as long; dc setae subequal to other thoracic macrosetae; anepisternum and anepimeron entirely covered in silver pubescence ( Figs 5, 6 ); wing dark brown with irregularly mottled pattern ............................................... stuckenbergi sp. n.

– Scape 1.8× as long as flagellomeres combined ( Figs 10 , 21 ); flagellomere 1 subovoid,>2× as long as thick; dc setae shorter and finer than other thoracic macrosetae; parts of anepisternum and anepimeron shiny black; wing mostly hyaline.............. sp. A

Figures

Figs 3, 4. Xestomyza lugubris Wiedemann, habitus, dorsal: (3) male, overall length 11 mm; (4) female, overall length 9 mm.

Figs 9–12. Xestomyza spp., heads: (9) X. lugubris, ♀ holotype, lateral; (10) Xestomyza sp.A, ♀, lateral; (11) X. lugubris, ♂, dorsal; (12) X. stuckenbergi sp. n., ♀ paratype, dorsal. Not to scale.

Fig. 1. Xestomyza lugubris Wiedemann, male, habitus, lateral, overall length 11 mm.

Fig. 2. Xestomyza lugubris Wiedemann, female, habitus, lateral, overall length 9 mm.

Figs 7, 8. Xestomyza stuckenbergi sp. n., habitus, dorsal:(7) male,overall length 6.2 mm;(8) female, overall length 6.4 mm.

Figs 5, 6. Xestomyza stuckenbergi sp. n., habitus, lateral: (5) male, overall length 6.2 mm; (6) female, overall length 6.4 mm.

Figs 20, 21. Xestomyza spp., antenna, lateral: (20) X. stuckenbergi sp. n., ♂; (21) Xestomyza sp.A, ♀. Scale bar = 1 mm.