Deuterixys Mason, 1981

Zheng, Minlin & Song, Dongbao, 2020, A review of Deuterixys Mason from China, with description of three new species (Hymenoptera, Braconidae, Microgastrinae), Zootaxa 4728 (4), pp. 489-497 : 490

Key to Old World species of the genus Deuterixys Mason

1. Apical width of T2 at most 1.7–1.8 × its medial length; legs yellow with only hind tibia and tarsus more or less infuscate … 2

- Apical width of T2 2.0 × its medial length; legs dark brown, blackish to black................................... ... 6

2. Vein 2-CU1 of fore wing 2.0 × as long as vein 1-CU1; T3 rugose to rugulose; preapical segment of antenna short, about 2.0 × as long as wide; [ Korea Mongolia; Far East Russia; Tajikistan]....................... … D. condarensis (Tobias, 1960)

- Vein 2-CU1 of fore wing at most 1.2 × as long as vein 1-CU1................................................… 3

3. T3 smooth and shiny; preapical segment of antenna more than 2.0 × as long as wide [ China] …. D. bifossalis Zeng & Chen

- T3 densely rugulose or subrugulose, dull …................................................................ 4

4. Hind tibia about 0.7 × as long as hind tarsus; body mostly fusco-testaceous; fore wing with 1-CU1: 2-CU1: m-cu= 9: 11: 9 [ China]......................................................................... ... D. longitarsus , sp. nov.

- Hind tibia about 0.9 × or more as long as hind tarsus, body mostly blackish, if other colour, then fore wing with 1-CU1: 2-CU1: m-cu= 11: 11: 9 ….................................................................................... 5

5. Body colour mostly blackish; inner hind tibial spurs about 0.4 × as long as hind basitarsus [ China] ..... D. jilinensis , sp. nov.

- Body colour mostly fusco-testaceous; inner hind tibial spurs about 0.3 × as long as hind basitarsus [ China] ..................................................................................... .. Deuterixys . shennongensis , sp. nov.

6. T3 densely rugulose or subrugulose, dull; T2 with rugosity similar to that of T1; T1 parallel- or indistinctly subparallel-sided; propodeum medially with more or less transverse rugulosities along medio-longitudinal keel, otherwise propodeum smooth..................................................................................................… 7

- T3 shagreened or almost smooth, shiny; T1 converging apically; propodeum smooth, at most with a few and very short rugulae along hind carina and above lunula..................................................................... ... 8

7. T1 subrectangular, 1.2–1.3 × as long as wide; T2 and T3 almost equal in length; inner hind tibial spurs much longer than half length of hind basitarsus [Palaearctic, unknown from China].......................… D. carbonaria (Wesmael, 1837)

- T1 more than 1.5 × as long as wide; T2 distinctly longer than T3; inner hind tibial spurs shorter than half length of hind basitarsus [ China] .................................................................... D. curticalcar Zeng & Chen

8. Vein 1-R1 of fore wing as long as or slightly shorter than pterostigma. [T1 posteriorly weakly to moderately converging, its basal width at most 0.3 × its apical width. Pterostigma 2.7–2.9 (rarely up to 3.0) × as long as wide. First tergite always entirely black. Tegula brownish black to brownish yellow. Middle and hind femora black(ish) [Palaearctic, but unknown from China]..................................................................... … D. rimulosa (Niezabitowski, 1910)

- Vein 1-R1 slightly longer than pterostigma …............................................................... 9

9. T1 wedge-shaped, 1.6–2.0 × as long as wide basally; T2 shorter than T3, somewhat less transverse, twice wider behind than long medially; pterostigma 2.3–2.4 × as long as wide [Central Europe] ....................... D. plugarui (Tobias, 1975)

- The widest part of T1 at about 2/3 distance from its base, anterior third and posteriorly with weakly converging sides, about 1.5 × as long as wide; T2 slightly longer than T3, somewhat more transverse, its posterior width 2.2 × its medial length; pterostigma about 3.0 × as long as wide [ Australia].................................... … D. anica Austin & Dangerfield, 1992