Delia bracata (Rondani, 1866) Although

Ackland, D. M., 2008, Revision of Afrotropical Delia Robineau-Desvoidy, 1830 (Diptera: Anthomyiidae), with descriptions of six new species, African Invertebrates 49 (1), pp. 1-75 : 12-14

Supplementary key to the Delia bracata subsection

This subsection contains some of the more widespread and abundant Delia species in the Afrotropical Region, including species of economic importance.A more detailed key to this group is thus provided.

Key to males

1 Arista relatively long haired, length of longest hairs (in proximal half) up to 5× diameter of aristal base ( Fig. 29 ). Abdomen long and narrow, with almost parallel lateral margins. Vein C ventrally with row of setulae. Postpedicel almost 2.5 times as long as wide. Mid tibia with a small av. Terminalia: surstylus ( Fig. 6 ) straight and of equal width for most of its length ............................. arambourgi (Séguy)

– Arista short pubescent, length of longest hairs not much longer than twice basal aristal diameter ( Fig. 30 ). Terminalia: surstylus not as above ( Figs 1 , 12 , 17 , 31 ) ............................................................................................................................. 2

2(1) Mid tibia without an av; fore tibia normally with 2 pv; hind femur ( Fig. 23 ) with 4–6 av in distal half. Terminalia: cercal plate in lateral view ( Fig. 13 ) extending between and beyond bases of surstyli, with rounded and widened apex (diagnostic for this species); surstyli at level of apex of cercal plate in caudal view ( Fig. 12 ) widely separated ........................................................................ flavibasis (Stein)

– Mid tibia with 1–2 small av ................................................................................. 3

3(2) Hind femur ( Fig. 27 ) with numerous (8–12) av, which are 2–3 times as long as greatest depth of femur and have fine curling tips directed apically; fine pv and hairs also numerous. Terminalia: surstylus as in Fig. 17 . ............. urbana (Mall.)

– Hind femur with less numerous av without curling tips (as in Fig. 25 ) .............. 4

4(3) Hind tibia with only 2 ad and 2 pd; all leg setae short and fine, hardly longer than tibial diameter. Sternites III and IV ( Fig. 33 ) very long and narrow. Terminalia: surstylus ( Fig. 31 ) in caudal view wide medially, in lateral view ( Fig. 32 ) sinuate on anterior margin ......................................................... madagascariensis sp. n.

– Hind tibia with 3 ad and 3 pd; leg setae longer. Sternites III and IV ( Fig. 3 ) approximately quadrilateral. Terminalia: surstylus in caudal view ( Fig. 1 ) sinuate and narrow in distal half, in lateral view straight on anterior margin ( Fig. 2 ) ...... .................................................................................................... bracata (Rond.)

Although D. modesta (Stein) has been described from both sexes, I have not been able to find any specimens that might be referable to this species, and the original type material is reportedly lost. From the description, modesta might run down to madagasca-riensis.

Key to females

1 Mid tibia without an av; fore tibia generally with 2 pv. Parafacials adjacent to lunule with orange-brown sheen-stripe, depending on angle of vision. Knees and tibiae often orange-brown .......................................................... flavibasis (Stein)

– Mid tibia with a small av ..................................................................................... 2

2(1) Arista with long hairs, length of longest hairs up to 5× diameter of aristal base. Orbits infuscated with brownish dust. Abdomen with more distinct median vitta, lateral areas of tergites much less dusted and with shining patches from some angles of vision. Scutum more distinctly vittate, especially postsuturally ............ ............................................................................................. arambourgi (Séguy)

– Arista with longest hairs not much longer than twice diameter of aristal base. Abdomen with indistinct and interrupted median vitta, lateral areas densely dusted greyish with practically no shining areas. Scutum presuturally very indistinctly vittate ................................................................................................................... 3

3(2) Hind femur with at least one of av distinctly longer than depth of femur ( Fig. 28 ). Arista very short pubescent, longest hairs near base shorter, or as long as diameter of aristal base ................................................................................ urbana (Mall.)

– Hind femur with av shorter, none longer than depth of femur ( Fig. 26 ). Arista distinctly pubescent ( Fig. 30 ), longest hairs distinctly longer than diameter of aristal base ............................................................................................. bracata (Rond.)

The female of D. madagascariensis sp. n. is unknown. It will probably key out at couplet 3, and differ from urbana and bracata by having the hind tibia with only 2 ad and 2 pd. It may be a synonym of the unrecognized modesta . As the male of madagasca-riensis is only known from Madagascar, and modesta has been described from Kenya, I prefer to treat these as distinct species until more material is available, especially males of modesta from the type locality.

Figures

Figs 23–30. Hind femur and arista: (23–28) Hind femora: (23) Delia flavibasis, male; (24) D. arambourgi, male; (25) D. bracata, male; (26) ditto, female; (27) D. urbana, male; (28) ditto, female; (29, 30): Arista, male: (29) D. arambourgi, (30) D. bracata.

Figs 6–11. Delia arambourgi, male (Ethiopia): (6) cercal plate and surstyli; (7) ditto, lateral view; (8) sternites III–V, ventral view; (9) ditto, lateral view; (10) distiphallus, lateral view; (11) ditto, ventral view. Scale bar = 0.1 mm.

Figs 1–5. Delia bracata, male (Zimbabwe): (1) cercal plate and surstyli; (2) ditto, lateral view; (3) sternites III–V, ventral view; (4) distiphallus, lateral view; (5) ditto, ventral view. Scale bar = 0.1 mm.

Figs 12–16. Delia flavibasis, male (S. Africa): (12) cercal plate and surstyli; (13) ditto, lateral view; (14) sternites IV–V, ventral view; (15) distiphallus, lateral view; (16) ditto, ventral view. Scale bar = 0.1 mm.

Figs 17–22. Delia urbana, male (S. Africa): (17) cercal plate and surstyli; (18) ditto, lateral view; (19) sternites III–V, ventral view: (20) ditto, lateral view; (21) distiphallus, lateral view; (22) ditto, ventral view. Scale bar = 0.1 mm.

Figs 31–36. Delia madagascariensis sp. n., paratype male (Madagascar): (31) cercal plate and surstyli; (32) ditto, lateral view; (33) sternites III–V; (34) gonites; (35) distiphallus, lateral view; (36) ditto, ventral view. Scale bar = 0.1 mm.