Dolichocephala, Macquart, 1823

Sinclair, Bradley J. & Plant, Adrian R., 2017, Dolichocephala Macquart of Thailand (Diptera: Empididae: Clinocerinae), Zootaxa 4358 (3), pp. 551-568 : 566

Key to Thailand species of Dolichocephala

1 Wing infuscate only, without white spots or irrorations; auxiliary crossvein absent................ D. immaculata sp. nov.

- Wing with white spots or irrorations (Figs 8–16); auxiliary crossvein present...................................... 2

2 Pleura mostly yellow except for dorsal margin adjacent to scutum (Fig. 8); distiphallus with balloon-like inflated membranous sac beneath sclerotized cap ( Fig. 1 )........................................................ D. bicolor sp. nov.

- Pleura dark brown, concolourous with scutum (Fig. 10); distiphallus without balloon-like membranous sac.............. 3

3 R2+3 ending in costa proximal to branching of radial fork (Figs 11, 12, 14)........................................ 4

- R2+3 ending in costa distal to branching of radial fork (Fig. 16).................................................. 6

4 R4 straight and divergent from R5 throughout its length; apical spot in cell r2+3 large, expanding apex of cell (Fig. 11); phallus with anvil-shaped distiphallus ( Fig. 4 )........................................................ D. incus sp. nov.

- R4 sinuous, curved around spot in cell r4; apical spot in cell r2+3 not expanding apex of cell (Figs 12, 14); phallus with distiphal- lus not anvil-shaped ( Fig. 5 ), or without distiphallus ( Fig. 6 ).................................................... 5

5 Cellsm1, m2 and m4 with one spot each (Fig. 14); phallus very stout and nearly straight, apex without articulated distiphallus ( Fig. 6 )............................................................................... D. srisukai sp. nov.

- Cells m1, m2 and m4 with at least two spots each (Fig. 12); phallus slender and strongly arched, apex with articulated distiphal- lus ( Fig. 5 ).......................................................................... D. longicerca sp. nov.

6 Clasping cercus strongly tapered apically with narrow tip; apex of distiphallus broadly inflated laterally ( Fig. 7 )........................................................................................... D. thailandensis sp. nov.

- Clasping cercus L-shaped, not tapered apically with broadly rounded tip; apex of distiphallus not inflated laterally ( Fig. 2 )........................................................................................ D. curvata sp. nov.

Figures

FIGURES1–4. Male terminaliaof Dolichocephala spp.inThailand,lateral view.1. D.bicolor sp.nov.; 2. D.curvatasp. nov.; 3. D. immaculata sp. nov.; 4. D. incus sp. nov. Scale bars = 0.1 mm. Abbreviations: cl cerc—clasping cercus; distphdistiphallus; sbepand scl—subepandrial sclerite.

FIGURES 5–7. Male terminalia of Dolichocephala spp. in Thailand, lateral view. 5. D. longicerca sp. nov.; 6. D. srisukai sp. nov.; 7. D. thailandensis sp. nov. Scale bars = 0.1 mm. Abbreviations: cl cerc—clasping cercus; distph—distiphallus; phphallus.