Key to the species of Quartinia André, 1884

(females and males)

1. Tegula with broadly rounded outer margin produced posterior to right to blunt medio-posterior angle (Figs 1A, C, 3A, 4A, 6A, 10A); disc of clypeus shallowly concave in most species (except Q. pusilla)...................................... 2

- Tegula with less broadly rounded outer margin not produced posterior to roundly-acute posterior end, posterior end often more or less produced medio-apically (Figs 2A, 5A, 8A, 9A); clypeus always evenly convex............................. 7

2. Very small species (total body length about 2 mm); clypeus evenly convex; frons and scutum moderately shining, with reticulate microsculpture between macropunctures (Fig. 6A, D); coloration from predominately brown to predominately yellow (Fig. 6A, B, E, F)........................................................................ Q. pusilla Kostylev, 1935

- Larger species (total body length 3.5– 7 mm); disc of clypeus shallowly concave; at least scutum (and sometimes also frons) with more shining interspaces between macropunctures, with less distinct reticulate microsculpture (Figs 1A, C, D, 3A, C, 4A, B, 10A, D, 13A); coloration variable..................................................................... 3

3. Occiputal carina strongly lamellate, forming blunt angle in front of ocular sinus (Fig. 10C); frons and scutum with coarse sparse punctures and shining interspaces between them (Fig. 10A, D); total body length 6–7 mm ....... Q. uzbeka Kostylev, 1935

- Occiputal carina not lamellate or very weakly lamellate, usually not forming angle in front of ocular sinus or this angle indistinct (Figs 1B, 3B, 4D, 13B); frons and scutum with less coarse punctures (Figs 1A, C, D, 3A, C, 4A, B, 13A), interspaces between punctures on frons sometimes with distinct reticulate microsculpture (Figs 3C, 4B); total body length at most 5.5 mm..... 4

4. Female predominately yellow, lower half of frons yellow, scutum completely yellow (Fig. 1A); male black with whitish pattern, frons nearly completely whitish (Fig. 1B–D), tergum VII reddish brown with pale yellow spot (Fig. 1E)........................................................................................... Q. chlorotica (Morawitz, 1888)

- At least scutum of female completely or nearly completely black (Figs 3A, 4A, 13B), frons usually entirely black (Figs 3C, 4B, 13A) or with a central spot in lower half (in Q. mongolica); male tergum VII uniformly brown, reddish to reddish-brown (Fig. 4C), or reddish-yellow................................................................................. 5

5. Frons with shining interspaces between macropunctures, with indistinct microsculpture (Fig. 13A); male with slenderer harpide (Fig. 11B)...................................................................... Q. funebris Kostylev, 1935

- Frons with less shining interspaces between macropunctures, with distinct reticulate microsculpture (Figs 3C, 4B); male with broader harpide (Fig. 11C, D)........................................................................... 6

6. Larger species (total body length 4.5–5.5 mm); coloration predominately black with pale yellow pattern, pale yellow color usually outlined by ferruginous, female tergum VI and male tergum VII reddish or reddish-brown (Figs 3A, B, D, 4A, C, D); cupula less broad in relation to remaining parts of genitalia (Fig. 11C)................... Q. mikhaili Fateryga, sp. nov.

- Smaller species (total body length 3.5– 4 mm); coloration black with extensive orange-yellow pattern, female tergum VI and male tergum VII reddish-yellow (Fig. 13B); cupula broader in relation to remaining parts of genitalia (Fig. 11D).................................................................................... Q. mongolica (Morawitz, 1889)

7. Posterior end of tegula not produced (Fig. 2A); frons and scutum completely dull, with strong reticulate microsculpture between macropunctures (Fig. 2A, C); coloration of female predominately yellow (Fig. 2A–D); male unknown.............................................................................................. Q. kozlovi Fateryga, sp. nov.

- Posterior end of tegula strongly produced (Figs 5A, 8A, 9A); at least scutum (and sometimes also frons) with more shining interspaces between macropunctures, with less strong reticulate microsculpture (Figs 5A, 8A, 9A); coloration variable but not so yellow........................................................................................... 8

8. Inner margin of tegula nearly straight (Fig. 5A); frons very densely puncatate, reticulately microsculptured interspaces between macropunctures less than puncture diameter (Fig. 5D, E); scutum densely punctate, interspaces on its anterior part less than puncture diameter (Fig. 5A); body black with pale yellow pattern (Fig. 5A–E)................. Q. popovi Richards, 1962

- Inner margin of tegula strongly emarginate so that posterior end of tegula distinctly produced medially (Figs 8A, 9A); frons more sparsely puncatate, reticulately microsculptured interspaces between macropunctures at least as puncture diameter (Figs 8B, 9B, 13C, F); scutum sparsely punctate, interspaces on its anterior part much exceeding puncture diameter (Figs 8A, 9A); coloration varies from predominately black with yellow and reddish-brown pattern to reddish-brown with yellow pattern (Figs 8A–D, F, 9A–D, 13C–G)............................................................................... 9

9. Larger species (total body length 4–5 mm); reticulately microsculptured interspaces between macropunctures on frons about as puncture diameter or not much larger (Fig. 13C, F)................................... Q. shestakovi Kostylev, 1935

- Smaller species (total body length about 3 mm); reticulately microsculptured interspaces between macropunctures on frons several times exceeding puncture diameter (Figs 8B, 9B)............................. Q. sovietica Fateryga, sp. nov.