Bengalia Robineau­Desvoidy, 1830

Kurahashi, Hiromu & Kirk-Spriggs, Ashley H., 2006, The Calliphoridae of Namibia (Diptera: Oestroidea), Zootaxa 1322 (1), pp. 1-131 : 14-15

Key to species of Bengalia Robineau­Desvoidy

1. 5 th tergite with median discal bristle.............................................................................. 2

­ 5 th tergite without median discal bristle (not recorded from Namibia) ........................... ....................................................................... B. africana Malloch & B. aliena Malloch

2. Hind tibia with 1–3 distinct pd; posterior projection of ♂ 5 th sternite more or less quadrangular, with at most slightly emarginated posterior margin ( Fig. 1 ).......................... .............................................................................................. B. peuhi Villeneuve (p. 62)

­ Hind tibia without pd; posterior projection of ♂ 5 th sternite with distinct notch posteriorly ................................................................................................................................ 3

3. Male............................................................................................................................... 4

­ Female ........................................................................................................................... 8

4. Hind tibia on ventral surfaces with short hairs, not surpassing tibial diameter; anepimeron clothed in pale hairs only, rarely with a few black hairs among them; 4 th terg­ ite with median marginals situated close together; posterior projection of 5 th sternite with pair of tapered ‘horns’ ( Fig. 2 ) ....................... B. spinifemorata Villeneuve (p. 63)

­ Hind tibia on ventral surface, fringed with long hairs surpassing tibial diameter ........ 5

5. Hind tibia fringed with long hairs on antero­ventral to postero­ventral surfaces ......... 6

­ Hind tibia fringed with long hairs on antero­ventral surface only ................................ 7

6. Posterior projection of 5 th sternite with truncate posterior margin ( Fig. 3 ); tergites 3–5 testaceous yellow, semi­transparent .................... B. gaillardi Surcouf & Guyon (p. 61)

­ Posterior projection of 5 th sternite with pointed inner posterior margin, outer margin usually rounded, but truncated in some specimens ( Fig. 4 ); tergites 3–5 entirely or largely infuscated in ground colouration .................. B. floccosa (van der Wulp) (p. 61)

7. Posterior projection of 5 th sternite slightly longer than wide, with small, almost circular notch posteriorly ( Fig. 5 ); body predominantly darker in colour.................................... ......................................................................................... B. cuthbertsoni Zumpt (p. 60)

­ Posterior projection of 5 th sternite broader than long, with wide posterior emargination (not recorded from Namibia) ............................................................ B. depressa Walker

8. Sternites 2–5 with very stout marginal spines ..... B. gaillardi Surcouf & Guyon (p. 61)

­ Sternites 2–5 without stout spines, with normal hairs and bristles only ....................... 9

9. Anepimeron with pale hairs on upper portion, rarely with a few black hairs near wing base; 4 th tergite with median marginal bristles situated close together, separated from each other by distance not, or very barely exceeding, half of that between discal bristles on 5 th tergite ................................................... B. spinifemorata (Villeneuve) (p. 63)

­ Anepimeron with a few black hairs on upper portion; 4 th tergite with median marginal bristles separated by distance almost as great as that between discal bristles on 5 th tergite................................................................................................................................. 10

10. 2 nd sternite with strong marginal bristles.......................................................................... .............................. B. floccosa (van der Wulp) & B. cuthbertsoni Zumpt (pp. 61 & 60)

­ 2 nd sternite without strong marginal bristles (not recorded from Namibia)..................... .......................................................................................................... B. depressa Walker

Figures

FIGURES 1–6. Male 5th sternites of Bengalia spp., ventral aspect. 1. B. peuhi (Villeneuve). 2. B. spinifemorata Villeneuve. 3. B. gaillardi Surcouf and Guyon. 4. B. floccosa (van der Wulp). 5. B. cuthbertsoni Zumpt. 6. B. aliena Malloch. Scale bars = 0.2 mm.