Thinolestris

Grootaert, Patrick & Evenhuis, Neal L., 2006, On the distribution of the marine genus Thinolestris Grootaert & Meuffels (Diptera, Dolichopodidae) with a description of a new species from Singapore, Malaysia and Brunei, Zootaxa 1134, pp. 59-68 : 61

Key to male Thinolestris

1. Thorax black in ground­colour. Antenna with third segment dark brown .................. 2

­ Thorax yellowish in ground­colour. Antenna yellow (third segment a little darker than basal segments) ............................................................................................................ 3

2. Basal abdominal tergite with a narrow yellow anterior margin. Tip of hypandrium only shallowly indented ( Fig. 15 ). Sulawesi ........... T. obscura Grootaert & Meuffels, 1989

­ Basal abdominal tergite completely black. Tip of hypandrium deeply indented ( Fig. 13 ) Singapore, Malaysia, Brunei.......................................................... T. nigra sp. nov.

3. Hairs on abdominal tergites brownish, marginal hairs black. Setae on thorax black. Tip of hypandrium indented ( Fig. 12 ) Papua New Guinea.................................................... ............................................................................ T. luteola Grootaert & Meuffels, 1989

­ Hairs on abdominal tergites yellowish white. Setae on thorax brown. Tip of hypandrium not indented ( Fig. 14 ). Thailand, Malaysia T. thaica Grootaert & Meuffels, 2001

Figures

FIGURES 12 – 15. Thinolestris extension on sternite 5 and hypandrium (left lateral view): 12. T. luteola (PNG); 13. T. nigra (Singapore, Malaysia, Brunei); 14. T. thaica (Thailand); 15. T. obscura (Sulawesi).