Chersodromia

Maeda, Takuya, 2011, New species of Chersodromia from the Russian Far East (Diptera: Empidoidea: Hybotidae: Tachydromiinae), Zootaxa 2979, pp. 1-24 : 3

Key to species of Chersodromia in the southern part of Primorsk Territory

1 Face between compound eyes narrower than frons ( Figs. 50 , 57 )............................................... 2

- Face between compound eyes wider than frons ( Figs. 20 , 27 , 34 , 41 )............................................. 3

2 Face between compound eyes narrower than median ocellus ( Fig. 50 ); all setulae on head and thorax whitish................................................................................................. C. stenopsis sp. nov.

- Face between compound eyes wider than median ocellus ( Fig. 57 ); all setulae on head and thorax brown or black............................................................................................... C. yamanei sp. nov.

3 In frontal view gena wider than one-third of maximum eye height ( Figs. 34 , 41 ); fore tibia with distinct tibial gland in basal part ( Fig. 19 ); vein R1 meeting costa after midway of wing ( Figs. 15, 16 )......................................... 4

- In frontal view gena narrower than one-third of maximum eye height ( Figs. 20 , 27 ); tibial gland indistinct; vein R1 meeting costa at or before midway of wing ( Figs. 13, 14 )............................................................. 5

4 Larger species, more than 2.5 mm in body length; katepisternum with small polished area; male fore tibia with posteroventral row of curved setulae; left cercus of male terminalia spatulate ( Figs. 45, 48 )...................... C. nubifera Coquillett

- Smaller species, less than 2.0 mm in body length; katepisternum largely polished; male fore tibia without posteroventral row of curved setulae; left cercus of male terminalia oval ( Fig. 40 ).................................... C. mohican sp. nov.

5 Outermost lobe of left surstylus of male terminalia rounded ( Figs. 31, 33 ). Female unknown.............. C. leleji sp. nov.

- Outermost lobe of left surstylus of male terminalia elongated ( Fig. 24 ). Female unknown........... C. gamoviensis sp. nov.

Figures

FIGURES 50 – 52. Male of Chersodromia stenopsis sp. nov. (holotype). 50. Head. 51. Antenna. 52. Thorax. Scale in mm.

FIGURES 57 – 59. Male of Chersodromia yamanei sp. nov. 57. Head (paratype). 58. Antenna (holotype). 59. Thorax (paratype). Scale in mm. acr sl: acrostichal setula; ap sctl s: apical scutellar seta; dc s: dorsocentral seta; dc sl: dorsocentral setula; npl s: notopleural seta; pal s: postalar seta; ph s: posthumeral seta; pprn s: postpronotal seta; sbap sctl sl: subapical scutellar setula; spal s: supra-alar seta.

FIGURES 20 – 22. Male of Chersodromia gamoviensis sp. nov. (holotype). 20. Head. 21. Antenna. 22. Thorax. Scale in mm.

FIGURES 27 – 29. Male of Chersodromia leleji sp. nov. 27. Head (holotype). 28. Antenna (holotype). 29. Thorax (paratype). Scale in mm.

FIGURES 34 – 36. Male of Chersodromia mohican sp. nov. 34. Head (paratype). 35. Antenna (holotype). 36. Thorax (paratype). Scale in mm.

FIGURES 41 – 43. Male characters of Chersodromia nubifera Coquillett based on the present material. 41. Head. 42. Antenna. 43. Thorax. Scale in mm.

FIGURES 13 – 19. Male characters of Chersodromia. 13 – 18. Wings. 13. Holotype of C. gamoviensis sp. nov. 14. Paratype of C. leleji sp. nov. 15. Paratype of C. mohican sp. nov. 16. C. nubifera Coquillett. 17. Holotype of C. stenopsis sp. nov. 18. Paratype of C. yamanei sp. nov. 19. Male fore tibial gland of Chersodromia nubifera Coquillett observed using a fore tibia cleared in hot solution of 10 % KOH (60 – 70 ° C for 1 – 1.5 hours). Scale in mm.

FIGURES 44 – 49. Male terminalia of Chersodromia nubifera Coquillett. 44. Right epandrial lamella with right surstylus. 45. Left cercus. 46. Left surstylus. 47. Left lateral view of terminalia. 48. Right lateral view of terminalia. (44 – 48: based on the present material.) 49. Left surstylus of male terminalia of syntype (Commander Islands). Scale in mm. alrs: apical lobe of right surstylus; blrs: basalmost lobe of right surstylus; lc: left cercus; ls: left surstylus; mlrs: median lobe of right surstylus; rc: right cercus; rel: right epandrial lamella.

FIGURES 37 – 40. Male terminalia of Chersodromia mohican sp. nov. (holotype). 37. Right epandrial lamella, right surstylus and right cercus. 38. Left surstylus. 39. Left lateral view of terminalia. 40. Right lateral view of terminalia. Scale in mm. alrs: apical lobe of right surstylus; blrs: basalmost lobe of right surstylus; lc: left cercus; ls: left surstylus; mlrs: median lobe of right surstylus; rc: right cercus; rel: right epandrial lamella.

FIGURES 30 – 33. Male terminalia of Chersodromia leleji sp. nov. (holotype). 30. Right epandrial lamella with right surstylus. 31. Left surstylus. 32. Left lateral view of terminalia. 33. Right lateral view of terminalia. Scale in mm. lc: left cercus; ls: left surstylus; rc: right cercus; rel: right epandrial lamella; rs: right surstylus.

FIGURES 23 – 26. Male terminalia of Chersodromia gamoviensis sp. nov. (holotype). 23. Right epandrial lamella with right surstylus. 24. Left surstylus. 25. Left lateral view of terminalia. 26. Right lateral view of terminalia. Scale in mm. lc: left cercus; ls: left surstylus; rc: right cercus; rel: right epandrial lamella; rs: right surstylus.