2. Colocasiomyia cristata species subgroup, new

Diagnosis. Phallapodeme shorter than 1/2 of phallal sheath (ch.47-1; Fig. 11D,F,H). Distal portion of oviscapt not distinctly differentiated from basal portion (ch.50-1; Fig. 12C).

Shared characters. All coxae and femora dark brown to black at least partly, except for Colocasiomia sumatrana sp. nov.; all tibiae distally dark brown to black; all tarsi brownish yellow, with darker tarsomere V (Fig. 15). Fore tarsomere II with 4 pegs (ch.14-2; Fig. 7B). Male abdominal sternite V wider than long (ch.18-0; Fig. 8A). Epandrium without seta as long as width of epandrium on posteroventral margin (ch.31-1; Fig. 10C,F). Cercus narrower than 1/2 cercal length; ventral/apical portion more or less differentiated from upper portion (ch.38,39-0; Fig. 10C,F). Phallal sheath apically not bilobed (ch.42-0; Fig. 11D,F,H).

Included taxa. Colocasiomyia ecornuta sp. nov., C. grandis sp. nov., C. vieti sp. nov., C. cristata species complex, C. sabahana species complex and C. xenalocasiae species complex.

Key. The digital, multiple-entry key “ Colocasiomyia cristata species subgroup” to all species of this subgroup has been constructed largely based on the character matrix of Appendix 6, and is available from the following website: https://evolgen.biol.se.tmu.ac.jp/Classification/index.jsp (Biological Classification and Identification System).

2.1. Species not assigned to any species complex