Key to known species of Apterolarnaca

1 Middle tibiae without apical spine on dorsal surface.......................................................... 2

- Middle tibiae with apical spine on dorsal surface.............................................................4

2 Face and occiput black (Fig. 1A).................................... Apterolarnaca nigrifrontis Bian & Shi sp. nov.

- Face yellowish brown with some black spots (Fig. 2A; Gorochov, 2004: Fig. 99)................................... 3

3 Face with 3 black spots (Gorochov, 2004: Fig. 99), male subgenital plate with lateral lobes slightly bifurcate apically (Gorochov, 2004: Figs. 101–102); posterior margin of female subgenital plate slightly projected in the middle (Gorochov, 2004: Fig. 104)..................................................................... Apterolarnaca ulla Gorochov, 2004

- Face with 4 black spots (Fig. 2A), male subgenital plate with lateral lobes obviously bifurcate apically (Fig. 2F)....................................................................... Apterolarnaca quadrimaculata Bian & Shi sp. nov.

4 Frons and pronotum yellowish with some black patterns (Gorochov, 2004: Figs. 105–106); female subgenital plate longer than broad; basal area of ovipositor with 1 pair of digitate lobes, projecting caudad. Male unknown................................................................................................. Apterolarnaca apta Gorochov, 2004

- Face and pronotum yellowish brown (Bian & Shi, 2015: Figs. 1–2, 11–12); female subgenital plate broader than long (Bian & Shi, 2015: Fig. 18); basal area of ovipositor with 1 pair of oval, lateral lobes, which are projecting outwards (Bian & Shi, 20 15: Fig. 17). Lateral lobes of male ninth abdominal tergite spine-shaped in dorsal view, rectangular in apical view, its apices truncate (Bian & Shi, 2015: Figs. 7–8)............................ Apterolarnaca truncatoloba (Li & Liu, 2015) com. nov.