Key to adult males of Asian Conochironomus 1. Wing vein R4+5 with, at most, 1 subapical seta................................... C. tobaterdecimus (Kikuchi & Sasa) - Wing vein R4+5 with>10 setae........................................................................... 2 2 Humeral area with 1–2 isolated setae (anterior dorsocentrals). Hypopygium as in Fig. 2 B, 3C,D........ C. sawngthai sp. n. - Humeral area bare. Hyopygium differs (e.g. Fig. 2 A, 3A,B).................................................... 3 3 Superior volsella base more-or-less rectangular, with digitiform projection crossing median margin and directed postero- mesally............................................................................... ‘E.’ effusus Dutta - Superior volsella base ovo-cuneate with gently convex inner and posterior margins, with digitiform projection crossing poste- rior margin, curved mesally............................................................... C. nuengthai sp. n.

Published as part of Cranston, Peter S., 2016, Conochironomus (Diptera: Chironomidae) in Asia: new and redescribed species and vouchering issues, pp. 315-331 in Zootaxa 4109 (3) on page 328, DOI: 10.11646/zootaxa.4109.3.3, http://zenodo.org/record/259767