Medetera

Naglis, Stefan & Bickel, Daniel J., 2012, Medetera (Diptera, Dolichopodidae) of Sri Lanka, Zootaxa 3188, pp. 55-63 : 56

Key to male Medetera of Sri Lanka

The key is mainly based on Bickel (1987) including only species from Sri Lanka and enhanced with the newly described species.

1 Mesonotum bright metallic green or blue violet; fore tarsomere 2 and 3 of male flattened ( Fig. 1 ); male hind tibia with apical tooth; dorsal surstylar arm prolonged, ventral arm reduced or lost.............................................. 2

- Mesonotum dark metallic green or black; fore tarsomeres normal; male hind tibia usually without apical tooth; dorsal and ven- tral surstylar arm subequal............................................................................. 4

2 Thoracic setae yellow; dorsal surstylar arm greatly expanded and rounded apically ( Figs 1 A, 2)........ peradeniya sp. nov.

- Thoracic setae black; dorsal surstylar arm parallel-sided (e.g., Fig. 3 )........................................... 3

3 First flagellomere yellowish; vein M subparallel with R4+5 before wing margin; lower calypter with yellowish setae; surstylus with 2 normal setae ventrally; ventral arm of cercus with normal setae (see Bickel 1987, figs. 3a, b)... platychira de Meijere

- First flagellomere black; vein M distinctly converging towards R4+5 to wing margin; lower calypter with black setae; surstylus with 1 normal and 1 curved flattened seta ventrally; ventral arm of cercus with 3–4 long sinuate setae ( Figs 1 B, 3).............................................................................................. kandyensis sp. nov.

4 4–6 strong dorsocentral setae present, anterior setae decreasing in size............................................ 5

- Only 2 strong dorsocentral setae present, anterior setae hair-like; hypopygium ( Fig. 5 ).............. colombensis sp. nov.

5 5–6 strong dorsocentrals present; hypopygium ( Fig. 4 )......................................... nuwarensis sp. nov.

- 4 strong dorsocentrals present, anterior 2 setae sometimes smaller.............................................. 6

6 Male hind basitarsus with distinct basal anteroventral tooth; hypopygium pyriform; epandrial seta absent ( Fig. 6 )........ 7

- Male hind basitarsus without tooth; hypopygium subrectangular; epandrial seta present (see Bickel 1987, fig. 17h)....... 8

7 Thorax with 3 bronze vittae; 4 strong dorsocentrals, decreasing in size anteriorly; epandrial lobes each with an apically hairy seta; ventral surstylar lobe with 1 strong apical seta; apical blade-like seta on cercus with serrate external margin (see Bickel 1987, fig. 18b)...................................................................... grisescens de Meijere

- Thorax without vittae; anterior 2 dorsocentrals distinctly shorter than posterior 2 bordering mesonotal depression; epandrial lobes with an apically hairy and an apically flattened seta; apical blade-like seta on cercus with smooth external margin ( Fig. 6 )................................................................................... subgrisescens sp. nov.

8 Thoracic setae yellow; fore and mid coxae with silvery pruinosity (see Bickel 1987, Fig. 17h).......... pumila de Meijere

- Thoracic setae black; coxae without silvery pruinosity....................................................... 9

9 Surstylus expanded dorsally; cercus with curled pedunculate seta (see Bickel 1987, fig. 16d)............. chandleri Bickel

- Surstylus parallel-sided; cercus without curled pedunculate seta (see Bickel 1987, fig. 16e).......... austroapicalis Bickel

Figures

FIGURE 1. Male right fore tarsomeres, anterodorsal view: (A) Medetera peradeniya sp. nov.; (B) Medetera kandyensis sp. nov. (scale bars = 0.1 mm).

FIGURE 3. Medetera kandyensis sp. nov. male hypopygium, left lateral view (scale bar = 0.1 mm).

FIGURE 4. Medetera nuwarensis sp. nov. male hypopygium: (A) left lateral view; (B) hypandrium and aedeagus, ventral view (scale bar = 0.1 mm).

FIGURE 5. Medetera colombensis sp. nov. male hypopygium, left lateral view; aed = aedeagus; cer = cercus; epl = epandrial lobe; eps = epandrial seta; hyp = hypandrium; sur = surstylus (scale bar: = 0.1 mm).

FIGURE 6. Medetera subgrisescens sp. nov. male hypopygium, left lateral view (scale bar = 0.1 mm).