Key to adult males of the genus Neozavrelia

1. Antenna with 10 flagellomeres. Anal point covered with microtrichia and short colorless spines. The lateral lobes at the anterior margin of tergite IX are well developed. Digitus well developed, extends beyond the edge of the superior volsella or forms a separate lobe......................................................................................... 2

- Antenna with 13 flagellomeres. Anal point with dark spines of various lengths. The lateral lobes on the anterior margin of tergite IX are absent. Digitus only partially extends beyond the edge of the superior appendage or is located under it......... 8

2. Digitus protrudes beyond the edge of the superior volsella and is located on a separate lobe. Anal point narrow and expanded medially (Figs 5–6). Inferior volsella foot-shaped laterally (Figs 7–8).................. N. fengchengensis Wang & Wang

- Digitus is developed to varying degrees, but does not form a separate lobe. The anal process, if narrow, is not expanded medially. Inferior volsella laterally of a different shape............................................................ 3

3. Total body color light yellow. The last segment of the antenna short (<800 μm) and apically widened (Fig. 124). Sensilla chaetica on ta 1 P 2 absent............................................................... N. yakuefea (Sasa & Suzuki)

- Total body color yellowish brown or dark brown. Apex of last segment of antenna without widening. Sensilla chaetica on ta 1 P 2 usually present........................................................................................ 4

4. The anal point broadly triangular, rounded apically. The superior volsella is elongated-oval, expanded medially and covers only the base of the digitus (Figs 89–91, 96–99). Sensilla chaetica on ta 1 P 2 absent. The apex of the antenna apex slightly widened (Fig. 94). AR 0.56–0.61............................................................. N. paramushirica sp. nov.

- The anal point parallel-sided. The superior volsella oval-shaped, half covers the digitus. Basitarsus of mid leg with 2–5 sensilla chaetica. The apex of the antenna normal................................................................... 5

5. Inferior volsella reaches 2/3 of the length of the gonostylus. Anterior margin of tergite IX straight. Superior volsella without microtrichia (Figs 60, 67–70)........................................................... N. nadezhdae sp. nov.

- Inferior volsella reaches 1/2 of the length of the gonostylus. Anterior margin of tergite IX triangular. Superior volsella usually with microtrichia...................................................................................... 6

6. Mid tibia with 1 spur (Fig. 45). Antenna length <900 μm. Maxillar palp length <500 μm, second palpomere swollen (Fig. 43). R with 11–15, R 4+5 with 2 setae, M 3+4 without setae......................................... N. kuzmichikha sp. nov.

- Mid tibia with 2 spurs. Antenna length>900 μm. Maxillar palp length>500 μm, second palpomere narmal. R with 17–29, R 4+5 with 11–25, M 3+4 with 3–16 setae......................................................................... 7

7. Wing length 2.6–2.7 mm. Antenna length about 1200 μm. R 1 with 0–4 setae. Frontal tubercles absent always. Gonostylus 133–150 μm long. Superior volsella densely covered with microtrichia (Figs. 53–59)................ N. minuta (Linevich)

- Wing length 1.8–2.4 mm. Antenna length less than 1200 μm. Frontal tubercles are about 2 mm in diameter or absent. R 1 with 8–14 setae. Gonostylus 102–129 µm (Figs 16–18). Superior volsella with rare microtrichia or without them (Figs 13–15)....................................................................................... N. kedrovaya sp. nov.

8. Ventral seta on the superior volsella absent. Superior volsella broad, elongated oval-shaped (Figs 102–103, 134–135)...... 9

- Ventral seta on the superior volsella present. Superior volsella narrow, elongated oval-shaped (Figs 80–81, 112–113)...... 10

9. Anal point short and broad rounded apically, dorsally with 14–16 dark strong spinulae located in a semicircle in the apical part (Figs 132–135). Maxillary palp normal (Fig. 136)............................................... N. zarya sp. nov.

- Anal point sclerotized along the edges, truncated apically, medially with 5 dark spinulae (Figs 108–109). The second member of the maxillary palp is longer than the third and fourth (Fig. 104)................................ N. samarga sp. nov.

10. Microtrichia located between the anal tergite bands form a reticular pattern. Anal point triangular (Figs 110–111, 118). Maxillary palp length 255 μm (Fig. 114)........................................................... N. tygda sp. nov.

- Microtrichia between anal bands located as usual. Anal point parallel-sided, sometimes slightly triangular (Figs 78–80, 86). Maxillary palp length 290–325 μm (Fig. 82)......................................... N. oyabeparvulus (Sasa et al.)