Key to species of subgenus Choeras Mason, 1981 from China

1. Vein r-m well developed, areolet completely closed, large or small (Figs. 3c, 6c, 9c, 10c, 13c, 15c, 16c, 17c, 18c)......... 2

- Stub of vein r-m of fore wing very short or absent, resulting in an open second areolet, areolet absent (Figs. 1c, 2d, 4c, 5c, 7c, 8c, 11c, 12c, 14c, 19c)................................................................................. 10

2. Areolet very small and triangular, vein r-m arising from vein 2-SR at a considerable distance proximal to the junction of vein r and 2-SR (Figs. 3c, 6c, 10c, 13c, 15c, 18c).................................................................. 3

- Areolet very large and quadrangular or subtriangular, triangular or subtriangular, vein r-m arising from the junction of vein r and 2-SR (Figs. 9c, 16c, 17c)............................................................................ 8

3. Ocelli in a very high triangle, the posterior transverse tangent to the median ocellus leaving far from the posterior pair (Fig. 15d). Propodeum mainly smooth, only medio-posteriorly with some rugae, without a median carina (Fig. 15f). Tergite I distinctly quadrangular, almost parallel-sided (Fig. 15i)........................................... A. tenuialatus sp. n.

- Ocelli in a moderately low triangle, the posterior transverse tangent to the median ocellus slightly touching the posterior pair (Figs. 3f, 6f, 10e, 13e, 18e). Propodeum largely smooth and with a strong median longitudinal carina which bifurcates into several short oblique carinae, more distinct at its base (Figs. 3h, 6j, 10g, 13g, 18g). Tergite I narrow apically (Figs. 3i, 6g, 10h, 13g, 18h)............................................................................................ 4

4. Side of scutellum with rather narrow crenulate depression, lunula large-sized and semicircular (Figs. 3h, 6i, 13g).......... 5

- Side of scutellum with relatively wide crenulate depression, lunula small-sized and obtusely triangular (Figs. 10g, 18g).... 7

5. Length of 16th segment shorter than 15th segment (Figs. 3b, 13b). Tergite II subtriangular (Figs. 3i, 13i). Ovipositor sheath short, its length (total length) shorter than hind tibia (Figs. 3j, 13j)............................................... 6

- Length of 16th segment equal to 15th segment (Fig. 6b). Tergite II quadrangular (Fig. 6g). Ovipositor sheath relatively very long, its length (total length) much longer than hind tibia (Fig. 6h)................................ A. fujianensis sp. n.

6. Pterostigma relatively wide, 2.4 times as long as wide (Fig. 13c). Vein r (actually r plus part of 2-SR because of low position of r-m) distinctly curved (Fig. 13c). Vein 2-SR straight (Fig. 13c). Vein 1-CU1 longer than vein 2-CU1 (Fig. 13c). Vein 1-SR pointing to the junction of vein 1-CU1 and 2-CU1 (Fig. 13c). Vein cu-a distinctly curved (Fig. 13d). Edge of vannal lobe beyond its widest part more or less straight and here with a fringe of hairs (Fig. 13d). Apical width of tergite I longer than median length of tergite II (Fig. 13i)....................................................... A. semilunatus sp. n.

- Pterostigma relatively narrow, 3.3 times as long as wide (Fig. 3c). Vein r straight (Fig. 3c). Vein 2-SR curved (Fig. 3c). Vein 1- CU1 equal to 2-CU1 (Fig. 3c). Vein cu-a straight (Fig. 3d). Edge of vannal lobe beyond its widest part very slightly concave and without a hair-fringe (Fig. 3d). Apical width of tergite I half of median length of tergite II (Fig. 3i)....................................................................................... A. compressifemur (Chen & Song, 2004)

7. Vein 1-R1 longer, about 1.5 times as long as pterostigma (Fig. 10c). Vein r slightly curved (Fig. 10c). 1-CU1 longer than 2- CU1 (Fig. 10c). Tergite I subtriangular, strongly narrowed apically (Fig. 10h). Apical width of tergite I half of median length of second tergite (Fig. 10h). Length of ovipositor sheath (total length) much longer than hind tibia (Fig. 10j)... A. longus sp. n.

- Vein 1-R1 relatively short, almost equal to length of pterostigma (Fig. 18c). Vein r straight (Fig. 18c). 1-CU1 shorter than 2- CU1 (Fig. 18c). Tergite I distinctly quadrangular, slightly narrow apically (Fig. 18h). Apical width of tergite I almost equal to median length of tergite II (Fig. 18h). Length of ovipositor sheath (total length) slightly shorter than hind tibia (Fig. 18j)........................................................................................... A. varicolor sp. n.

8. Propodeum largely smooth and shiny, only rugose laterally (Fig. 9g). Tergite I sharply narrowed apically, tergites I and II largely smooth, but only small area of them rugose (Fig. 9i). Tergite II subtriangular (Fig. 9i)........ A. longitergitus sp. n.

- Propodeum strongly rugose (Figs. 16g, 17g). Tergite I distinctly quadrangular and parallel-sided, tergites I and II largely and strongly rugose (Figs. 16h, 17h). Tergite II quadrangular (Figs. 16h, 17h).......................................... 9

9. Head robust, 1.5 times as wide as long, wider than mesoscutum (Fig. 16e). Ocelli in a moderately high triangle, the posterior transverse tangent to the median ocellus hardly touching the posterior pair (Fig. 16e). Face transverse, convex and without a median longitudinal carina (Fig. 16f). Vein 2-SR straight (Fig. 16c). Vein 1-CU1 equal to 2-CU1 (Fig. 16c). A. tumidus sp. n.

- Head 2.1 times as wide as long, narrower than mesoscutum (Fig. 17e). Ocelli in a moderately low triangle, the posterior transverse tangent to the median ocellus slightly touching the posterior pair (Fig. 17e). Face with a distinctly and incompletely longitudinal carina medially near the antennal sockets, its length about 0.3 times as long as face (Fig. 17f). Vein 2-SR curved (Fig. 17c). Vein 1-CU1 shorter than 2-CU1 (Fig. 17c).......................................... A. validicarinatus sp. n.

10. Propodeum without a median longitudinal carina (Figs. 1g, 7j, 11h, 19i)......................................... 11

- Propodeum with a strong or an incomplete median longitudinal carina (Figs. 2h, 4f, 5h, 8f, 12h, 14g).................. 14

11. Pterostigma relatively narrow (Fig. 1c). Vein r longer than vein 2-SR (Fig. 1c). Side of scutellum with rather narrow crenulate depression, lunula large-sized and semicircular (Fig. 1g)......................................... A. angustus sp. n.

- Pterostigma relatively wide (Figs. 7c, 11c, 19c). Vein r shorter than vein 2-SR (Figs. 7c, 11c, 19c). Side of scutellum with relatively wider crenulate depression, lunula small-sized and almost linear (Figs. 7g, 11i, 19g)........................... 12

12. Tergite I very long and narrow, sharply narrowed apically. Vein r straight (Fig. 19i)................. A. yunnanensis sp. n.

- Tergite I short and wide, slightly narrowed apically, even parallel-sided. Vein r slightly curved (Figs. 7j, 11h)............ 13

13. Subapical antennal segments slightly elongated (Fig. 11b). Edge of vannal lobe beyond its widest part very slightly convex (Fig. 11d). Width of scutellar sulcus about equal to length of scutellum (Fig. 11i). Apical width of tergite I about 2.0 times as long as median length of tergite II (Fig. 11h). Length of ovipositor sheath (total length) slightly shorter than hind tibia (Fig. 11j). Hypopygium with narrow longitudinal creases laterally, and acute apically (Fig. 11j)............ A. parviocellus sp. n.

- Subapical antennal segments moniliform and cubic (Fig. 7b). Edge of vannal lobe beyond its widest part straight (Fig. 7d). Width of scutellar sulcus slightly shorter than length of scutellum (Fig. 7g). Apical width of tergite I about 4.0 times as long as median length of tergite II (Fig. 7j). Length of ovipositor sheath (total length) slightly longer than length of hind tibia (Fig. 7i).

Hypopygium without longitudinal creases laterally and acute apically (Fig. 7i)................. A. grammatitergitus sp. n. 14. Ocelli relatively small, in a moderately high triangle, the posterior transverse tangent to the median ocellus hardly touching the posterior pair (Figs. 5e, 12f)............................................................................ 15

- Ocelli relatively large, in a very low triangle, the posterior transverse tangent to the median ocellus cutting into the posterior pair (Figs. 2e, 4e, 8d, 14e).............................................................................. 16

15. Body largely yellow, subapical antennal segments slightly elongated (Figs. 5a, 5b). Width of scutellar sulcus slightly longer than length of scutellum (Fig. 5h). Apical width of tergite I equal to median length of tergite II (Fig. 5g)....................................................................................................... A. flavicorpus sp. n.

- Body black, subapical antennal segments moniliform and subquadrate (Figs. 12a, 12b). Width of scutellar sulcus slightly shorter than length of scutellum (Fig. 12h). Apical width of tergite I longer than median length of tergite II (Fig. 12i)............................................................................................. A. rugulosus sp. n.

16. Side of scutellum with rather narrow crenulate depression, lunula large-sized and semicircular (Figs. 2h, 4f, 8f).......... 17

- Side of scutellum with relatively wide crenulate depression, lunula small-sized and obtusely triangular (Fig. 14g).............................................................................................. A. semirugosus sp. n.

17. Pterostigma relatively narrow (Fig. 4c). Vein r shorter than Vein 2-SR (Fig. 4c). Vein 2-SR curved (Fig. 4c). Ovipositor sheath relatively shorter, its length (total length) slightly longer than half of hind tibia (Fig. 4i).............. A. curvinervus sp. n.

- Pterostigma relatively wide (Figs. 2d, 8c). Vein r longer than Vein 2-SR (Figs. 2d, 8c). Vein 2-SR straight (Figs. 2d, 8c). Ovipositor sheath very long, its length (total length) longer than hind tibia (Figs. 2j, 8h)................................ 18

18. Mandible relatively wide and large (Fig. 2f). Vein 1-SR of fore wing pointing to the junction of vein 1-CU1 and 2-CU1 (Fig. 2d). Vein 1-CU1 equal to 2-CU1 (Fig. 2d). Vein cu-a of hind wing curved (Fig. 2c). Edge of vannal lobe beyond its widest part concave (Fig. 2c). Width of scutellar sulcus slightly shorter than length of scutellum (Fig. 2h)......... A. brevinervus sp. n.

- Mandible normal (Fig. 8e). Vein 1-SR of fore wing pointing to vein 2-CU1 (Fig. 8c). Vein 1-CU1 shorter than 2-CU1 (Fig. 8c). Vein cu-a of hind wing straight (Fig. 8c). Edge of vannal lobe beyond its widest part straight(Fig. 8c). Width of scutellar sulcus equal to length of scutellum (Fig. 8f)................................................... A. infirmicarinatus sp. n.