Mesopodagrion

Key to species and subspecies for Mesopodagrion

1 Rear of head black (Fig. 3 a); antehumeral stripe broken at the upper end (Fig. 4 a); basal half of cerci in dorsal view dilated, twice as wide as distal half (Figs. 8–10); Bifurcate process shorter than 1/2 length of S10, outer margin concave, smooth (Figs. 5 a, 8–10); apical lobes of genital ligula bifurcate at base (Fig. 1, d & e). ........... M. yachowensis

- Rear of head pale or at least pale at upper border (Fig. 3 b, c); antehumeral stripe complete or interrupted at upper end (Fig. 4 b–d); basal half of cerci in dorsal view as wide as, or slightly wider than distal half; bifurcate process not shorter than 1/2 length of S10, outer margin inflectional or arched and smooth (Figs. 5 b–d, 11–15); apical lobes of genital ligula bifurcate distal to base (Fig. 2, d & e) (M. tibetanum)............................................................................ 2

2 Pale occipital bar present (Fig. 4 b); only upper border of rear of head pale (Fig. 3 b); bifurcate process foot-like in latero-ventral view (Fig. 18), outer margin inflectional, not smooth (Figs. 5 b; 11). .............................. M. t. tibetanum

- Pale occipital bar absent (Fig. 4 c, d); rear of head entirely pale (Fig. 3 c); bifurcate process not foot-like in lateroventral view (Fig. 19), outer margin arched and smooth (Figs. 5 c–d, 12–15)........................... M. t. australe ssp. nov