Key to species of the genus Antocha from Sichuan, China (males) 1 Crossvein m-cu of wing as long as or longer than distance between it and base of cell dm (Fig. 1)..................... 3 – Crossvein m-cu of wing shorter than distance between it and base of cell dm (Fig. 2)............................... 2 2 Caudal margin of tergite 9 nearly straight between two small bumps (Fig. 3)............................. A. pallidella – Caudal margin of tergite 9 gently emarginate and weakly crenulate, without two small bumps (Fig. 4)........ A. nigribasis 3 Caudal margin of tergite 9 with pair of median lobes (Fig. 5), bumps (Figs 6–8), small tubercles (Fig. 9) or deep U-shaped median notch (Fig. 10)................................................................................ 4 – Caudal margin of tergite 9 smooth (Figs 11–14, 16, 18–20).................................................... 9 4 Caudal margin of tergite 9 with rounded, median bumps (Figs 6–8), small tubercles (Fig. 9) or deep U-shaped median notch (Fig. 10)............................................................................................ 5 – Caudal margin of tergite 9 with two obliquely truncated median lobes (Fig. 5).......................... A. emarginata 5 Apex of outer gonostylus narrowed to acute point (Figs 6–8).................................................. 6 – Apex of outer gonostylus bifid (Figs 9, 10)................................................................ 8 6 Apex of gonocoxite broadly rounded (Figs 7, 8)............................................................ 7 – Apex of gonocoxite narrowly elongated (Fig. 6)................................................... A. fortidens 7 Outer gonostylus strongly bent (Fig. 8)............................................ A. nebulipennis nebulipennis – Outer gonostylus arched, not bent (Fig. 7)........................................... A. nebulipennis immaculata 8 Interbase well developed, appearing loop-shaped; paramere approximately as long as gonocoxite, appearing as slender, simple rod (Fig. 9)................................................................................... A. bidens – Interbase small, narrow to acute point; paramere shorter than gonocoxite (Fig. 10).......................... A. bifida 9 Aedeagus connected with lateral structures (Figs 11–14)..................................................... 10 – Aedeagus covered by wide parameral sheath (Figs 15, 16) or without parameral sheath and any lateral structures (Figs 18–20) .................................................................................................. 13 10 Lateral structures branched on tip of aedeagus (Figs 12–14).................................................. 11 – Lateral structures very slender, twisted into complete spiral turn at distal end (Fig. 11)...................... A. spiralis 11 Lateral structure consists of two small branches (Figs 13, 14)................................................. 12 – Lateral structure consists of three small branches (Fig. 12).......................................... A. constricta 12 Outer branch of lateral structure approximately three times in length smaller than inner branch (Fig. 14).... A. quadrifurca – Outer branch of lateral structure very short, narrowed to acute point (Fig. 13)......................... A. multidentata 13 Aedeagus covered by wide parameral sheath (Figs 15, 16)................................................... 14 – Aedeagus not covered by parameral sheath (Figs 18–20)..................................................... 15 14 Parameral sheath forms four horns (Fig. 15)................................................. A. pulchra sp. nov. – Parameral sheath simple, without any structures (Fig. 16)......................................... A. minuticornis 15 Apex of outer gonostylus obtuse or rounded (Figs 18–20).................................................... 16 – Apex of outer gonostylus is gradually narrowed to acute tip (Fig. 17).................................. A. lacteibasis 16 Apex of aedeagus bifid (Fig. 18)................................................................. A. setigera – Apex of aedeagus curved, not bifid (Figs 19, 20)........................................................... 17 17 Paramere twisted, spiral-shaped (Fig. 20)............................................................. A. bella – Paramere straight, tapered (Fig. 19)................................................................ A. indica

Published as part of Markevičiūtė, Radvilė, Podenas, Sigitas & Saldaitis, Aidas, 2021, New Antocha Osten Sacken (Diptera: Limoniidae) from Sichuan, China, pp. 280-292 in Zootaxa 4969 (2) on page 282, DOI: 10.11646/zootaxa.4969.2.3, http://zenodo.org/record/4749005