Key to the species of Olecryptotendipes Zorina from the Russian Far East

Males

1. Acrostichals present; R and R 1 with setae; anal point narrow, parallel-sided; superior volsella with microtrichia ventrally, dorsal seta arising subapically.................................................................... O. lenzi (Zorina)

- Acrostichals absent; R and R 1 without setae; anal point widest at about 2/3 from base; superior volsella lacking microtrichia ventrally, dorsal seta arising apically or subapically (Fig. 2)................................... O. secundus (Zorina)

Pupae

1. Frontal setae present without any rod-shaped outgrowth; tergites II–V with rectangular patches of shagreen; anal lobe with 33–37 fringed taeniae..................................................................... O. lenzi (Zorina)

- Frontal setae absent with rod-shaped outgrowth (Figs 7, 13); tergites I–VI with a median longitudinal band of shagreen; anal lobe with 44–53 fringed taeniae (Figs 9–12)............................................... O. secundus (Zorina)

Larvae

1. Mentum slightly concave with triangular median teeth and 7 pairs of lateral teeth; maxillary palp with four 2-segmented sensillae apically.............................................................................. O. lenzi (Zorina)

- Mentum convex with 2 with two identical quadrangular medial and 5 pairs of lateral teeth (Figs 22, 29); maxillary palp with two 2-segmented and one simple sensillae apically (Figs 22, 28)............................... O. secundus (Zorina)