Medetera

Tang, Chufei, Wang, Baohai & Yang, Ding, 2015, New species of Medetera (Diptera: Dolichopodidae, Medeterinae) from Tibet, Zootaxa 3946 (3), pp. 427-435 : 428

Key to species (males) of Medetera in the Himalayas

(modified from Bickel 1987)

1 Small, body length less than 1.5 mm ..................................................................... 2

- Larger, body length more than 2.0 mm.................................................................... 3

2 Legs mainly yellow ( Bickel 1987)......................................................... M. chillcotti Bickel

- Legs dark metallic green to black ( Becker 1922)............................................ M. adsumpta Becker

3 Thorax with 3 strong dc ( Becker 1922).................................................... M. nudicoxa Becker

- Thorax at least with 4 strong dc......................................................................... 4

4 Hind tarsomere 1 with obvious dentate av; epandrium pyriform, inflated basally; epandrial lobes with bases almost completely fused, forming an elongate digitation process, from which the two bristles arise; hypandrium and phallus elongate and narrow in ventral view ( Fig. 13 ) (diadema-veles group).............................................................. 5

- Hind tarsomere 1 without dentate av; epandrium subrectangular; epandrial lobes of epandrium present with bases distinct and separated; hypandrium forming an elongate inverted trough over phallus, held out at angle from epandrium in ventral view ( Figs 6 , 9 ) (apicalis group)............................................................................. 6

5 Legs mainly yellow; bristles on epandrial lobes branched distally; cercus with apical toothed blade-like bristle, with distinctive midventral clavate projection ( Bickel 1987, fig. 18b).................................... M. grisenscens De Meijere

- Legs mainly black ( Fig. 3); bristles on epandrial lobes normal; cercus with thin, smooth claw-like apical bristle, with 1 small projection apically ( Figs 12–13 ).......................................................... M. sinuosa sp. nov.

6 Antenna all yellow ( Fig. 1 ); epandrium with 1 long apical bristle ( Fig. 6 ); ventral surstylus with 1 brown stripe at middle.................................................................................. Medetera exornata sp. nov.

- Antennal flagellomere brown to black; epandrium without apical bristle; ventral surstylus without pattern............... 7

7 Proboscis greatly enlarged, almost as long as eye height ( Bickel 1987, figs 17f–g).................... M. stomias Bickel

- Proboscis normal in size............................................................................... 8

8 Antennal scape and pedicel yellow....................................................................... 9

- Antenna all dark brown to black........................................................................ 10

9 Wing shorter than body; tibiae mainly yellow; cercus stout, with thin, curved dorsoapical bristle on short cuticular peduncle, with lateral leaf-shaped bristle ( Bickel 1987, fig. 16e)..................................... M. austroapicalis Becker

- Wing longer than body; tibiae black; cercus obviously thinner towards tip, with lateral dentation ( Yang et al. 2011, fig. 252)...................................................................................... M. xizangensis Yang

10 CuAx ratio less than 0.7 ( Fig. 2); legs all black; cercus without blade-like bristle; hypandrium tapered in basal half, subparallel in apical half in ventral view ( Figs 9–10 ).................................................... .. M. furva sp. nov.

- CuAx ratio 0.85; legs dark brown except distalmost femora yellowish; cercus with blade-like bristles; hypandrium expanded distally in ventral view................................................................................ 11

11 Epandrial bristles on short protuberance; epandrial lobes with distinct collar-like bases; short hairs present along ventral margin of epandrium between epandrial bristles and epandrial lobes; ventral surstylar arm with simple curved bristles; cercus with short blade-like bristle and long digitiform projection ( Bickel 1987, figs 17c–d).................. M. himalayensis Bickel

- Epandrial bristles on flat epandrial margin; epandrial lobes arising from epandrial margin without collar–like bases; ventral epandrial margin bare; ventral surstylar arm with flattened frayed bristle; cercus with elongate curved apical bristle and ventral costate blade-like bristle ( Bickel 1987, figs 17a–b)........................................... M. nepalensis Bickel

Figures

FIGURE 1. Medetera exornata sp. nov. Male. Scale bar = 1.0 mm.

FIGURES 11 – 13. Medetera sinuosa sp. nov., male. 11. Antenna; 12. genitalia, lateral view; 13. genitalia, ventral view. Abbreviations: epl = epandrial lobe, epn = epandrium, hyp = hypandrium, ph = phallus, sur = surstylus, cer = cercus. Scale bar = 0.2 mm.

FIGURES 5 – 7. Medetera exornata sp. nov., male. 5. Antenna; 6. genitalia, lateral view; 7. genitalia, ventral view. Abbreviations: epl = epandrial lobe, epn = epandrium, hyp = hypandrium, ph = phallus, sur = surstylus, cer = cercus. Scale bar = 0.2 mm.

FIGURES 8 – 10. Medetera furva sp. nov., male. 8. Antenna; 9. genitalia, lateral view; 10. genitalia, ventral view. Abbreviations: epl = epandrial lobe, epn = epandrium, hyp = hypandrium, ph = phallus, sur = surstylus, cer = cercus. Scale bar = 0.2 mm.