Chersodromia

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

publication ID	https://doi.org/ 10.5281/zenodo.202911
DOI	https://doi.org/10.5281/zenodo.6191950
persistent identifier	https://treatment.plazi.org/id/6B3487F7-FFF8-715D-979B-9FBE0089F920
treatment provided by	Plazi
scientific name	Chersodromia
status

Treatment

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

1 Face between compound eyes narrower than frons ( Figs. 50 View FIGURES 50 – 52 , 57 View FIGURES 57 – 59 )............................................... 2

- Face between compound eyes wider than frons ( Figs. 20 View FIGURES 20 – 22 , 27 View FIGURES 27 – 29 , 34 View FIGURES 34 – 36 , 41 View FIGURES 41 – 43 )............................................. 3

2 Face between compound eyes narrower than median ocellus ( Fig. 50 View FIGURES 50 – 52 ); all setulae on head and thorax whitish................................................................................................. C. stenopsis View in CoL sp. nov.

- Face between compound eyes wider than median ocellus ( Fig. 57 View FIGURES 57 – 59 ); all setulae on head and thorax brown or black............................................................................................... C. yamanei View in CoL sp. nov.

3 In frontal view gena wider than one-third of maximum eye height ( Figs. 34 View FIGURES 34 – 36 , 41 View FIGURES 41 – 43 ); fore tibia with distinct tibial gland in basal part ( Fig. 19 View FIGURES 13 – 19 ); vein R1 meeting costa after midway of wing ( Figs. 15, 16 View FIGURES 13 – 19 )......................................... 4

- In frontal view gena narrower than one-third of maximum eye height ( Figs. 20 View FIGURES 20 – 22 , 27 View FIGURES 27 – 29 ); tibial gland indistinct; vein R1 meeting costa at or before midway of wing ( Figs. 13, 14 View FIGURES 13 – 19 )............................................................. 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 View FIGURES 44 – 49 )...................... C. nubifera Coquillett View in CoL

- 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 View FIGURES 37 – 40 ).................................... C. mohican View in CoL sp. nov.

5 Outermost lobe of left surstylus of male terminalia rounded ( Figs. 31, 33 View FIGURES 30 – 33 ). Female unknown.............. C. leleji View in CoL sp. nov.

- Outermost lobe of left surstylus of male terminalia elongated ( Fig. 24 View FIGURES 23 – 26 ). Female unknown........... C. gamoviensis View in CoL sp. nov.