Key to World Neoheterospilus (Neoheterospilus) species

1. Second metasomal tergite with distinct basal area, which is delineated by deep and wide furrow (Figs 14, 15)............ 2

- Second metasomal tergite without or with indistinct very narrow basal area, which is sometimes weakly delineated by very shallow furrow (Fig. 26)................................................................................ 6

2. Basal area of second tergite narrow, anteriorly situated along median 0.4–0.7 of basal margin of tergite (Figs 14, 15). Second abscissa of radial vein (3-SR) as long as or longer than first abscissa (r) (Fig. 11). Hind femur usually narrow, 3.7–4.5 × longer than wide (Fig. 9)..................................................................................... 3

- Basal area of second tergite wide, anteriorly situated along almost entire basal margin of tergite. Second abscissa of radial vein (3-SR) not longer than first abscissa (r). Hind femur wide, 3.0–3.7 × longer than wide............................... 4

3. Antenna 21–23 antennomeres; first flagellomere 2.8–4.0 × longer than its apical width. Mesopleuron posteriorly to deep sternaulus with almost smooth additional longitudinal stripe. Second radial abscissa (3-SR) 0.35–0.37 × as long as third abscissa (SR1). Basal area of second tergite situated along median 0.7 of its basal margin; apical area of second tergite weakly constricted medially, its median length 0.65–0.70 × length of remainder of tergite. Face entirely smooth. Head black, mesosoma reddish-brown, but almost black dorsally; basal flagellomeres yellow to light brown. Body length 2.8–3.0 mm.—S. Africa........................................................................ N. (N.) africanus Belokobylskij, 2006

- Antenna 25–28 antennomeres (Fig. 1); first flagellomere 4.7–5.3 × longer than its apical width (Fig. 6). Mesopleuron posteriorly to deep sternaulus with striate additional longitudinal stripe (Fig. 8). Second radial abscissa (3-SR) 0.25–0.30 × as long as third abscissa (SR1) (Fig. 11). Basal area of second tergite situated along median 0.40–0.45 of its basal margin; apical area of second tergite not constricted medially, its median length 0.40–0.45 × length of remainder of tergite (Fig. 14). Face finely rugulose on wide sublateral vertical stripes (Fig. 2). Body entirely light reddish-brown to yellowish-brown; flagellum entirely dark brown to black (Fig. 1). Body length 2.4–3.5 mm.— Yemen .............................. N. (N.) alkowdi sp. nov.

4(2). Temple short, transverse diameter of eye 2.1–2.3 × longer than temple. Second abscissa of costal vein (1-SC+R) of hind wing absent. Antenna weakly setiform. Body pale. Body length 2.9–3.1 mm.— Australia ...................................................................................................... N. (N.) australicus Belokobylskij, 2006

- Temple longer, transverse diameter of eye 1.45–1.80 × longer than temple. Second abscissa of costal vein (1-SC+R) of hind wing present. Antenna filiform........................................................................... 5

5. Occipital carina dorsally almost straight. Sclerotised anterior short abscissa of first radiomedial vein (2-SR) present. Transverse diameter of eye 1.45–1.50 × longer than temple. Hind wing wide, its length 4.3–4.6 × maximum width. First flagellomere 3.5–4.0 × longer than its apical width, 1.1–1.2 × longer than second flagellomere. Median lobe of mesoscutum mostly setose. Ovipositor sheath dorsally with long and sparse and ventrally with medium-length and dense setae. Pterostigma dark brown. Mesosoma black. Body length 2.7–3.2 mm.— Korea ............................ N. (N.) koreanus Belokobylskij, 2006

- Occipital carina dorsally distinctly curved forwards. Sclerotised anterior abscissa of first radiomedial vein (2-SR) absent. Transverse diameter of eye 1.8 × longer than temple. Hind wing narrow, its length 5.8 × maximum width. First flagellomere 4. 7 × longer than its apical width, 0.9 × as long as second flagellomere. Median lobe of mesoscutum mostly glabrous. Ovipositor sheath dorsally and ventrally with short and rather dense setae. Pterostigma pale brown. Mesosoma brownish-yellow. Body length 1.8 mm.— Australia ................................................ N. (N.) cardaleae Belokobylskij, 2006

6(1). Second abscissa of costal vein (1-SC+R) of hind wing absent or almost absent (Fig. 28)............................. 7

- Second abscissa of costal vein (1-SC+R) of hind wing completely present........................................ 9

7. Transverse diameter of eye 1.3 × longer than temple. First flagellomere 3.3 × longer than apical width. Prescutellar depression with three transverse carinae. Second radial abscissa (3-SR) 1.15 × longer than first abscissa (r). Body length 2.6 mm.— Australia .............................................................. N. (N.) canberraensis Belokobylskij, 2006

- Transverse diameter of eye l.6–l. 9 × longer than temple (Fig. 19). First flagellomere 4.0–4.7 × longer than apical width (Fig. 21). Prescutellar depression with single (median) carina (Fig. 24). Second radial abscissa (3-SR) 0.4–0.9 × as long as first radial abscissa (r) (Fig. 27)................................................................................... 8

8. Hypoclypeal depression 1.2–1.3 × wider than distance from edge of depression to eye. Metacarp (1-R1) 1.1–1.2 × longer than pterostigma; recurrent vein (m-cu) in hind wing interstitial. Hind femur thick, 3.2–3.5 × longer than maximum width. Suture between second and third tergite almost smooth. Mesoscutum finely granulate-coriaceous. Length of first metasomal tergite 1.30–1.55 × its apical width. Body mainly brownish-yellow or yellow. Body length 1.7–1.8 mm.— Vietnam, China, Japan ..................................................................... N. (N.) subtropicalis Belokobylskij, 2006

- Hypoclypeal depression 1.7 × wider than distance from edge of depression to eye (Fig. 18). Metacarp (1-R1) 1.35 × longer than pterostigma; recurrent vein (m-cu) in hind wing distinctly antefurcal (Fig. 27). Hind femur slender, 4.2 × longer than maximum width (Fig. 17). Suture between second and third tergite distinctly crenulate (Figs 26, 29). Mesoscutum smooth (Fig. 24). Length of first metasomal tergite 1.1 × its apical width (Fig. 26). Body mainly dark reddish-brown to reddish-brown, metasoma mainly yellowish-brown (Fig. 17). Body length 2.6 mm.— Yemen ............................ N. (N.) yemenus sp. nov.

9. First flagellomere thick, 3.5 × longer than apical width. Mesosoma 1.5 × longer than height. Hind femur narrow, 4.0 × longer than wide. First metasomal tergite wide, almost as long as apical width. Second tergite 0.75 × as long as basal width. Body length 2.3–2.7 mm.— Cameroon, Congo, Kenya, Tanzania, Uganda; Indonesia; Mexico (?).............................................................................................. N. (N.) coffeicola (Schmiedeknecht, 1924)

- First flagellomere slender, 4.5–5.5 × longer than apical width. Mesosoma 1.8–1.9 × longer than height. Hind femur wide, 3.0–3.3 × longer than wide. First metasomal tergite narrow, 1.2–1.4 × longer than apical width. Second tergite almost as long as basal width....................................................................................... 10

10. Scapus 1.1–1.2 × longer than its maximum width, with dense and long setae on its apical margin. Temple longer, transverse diameter of eye 1.5–1. 7 × longer than temple (dorsal view). Median lobe of mesoscutum anteriorly almost straight. Ovipositor without distinct subbasal ventral excise. Widened apical part of ovipositor sheath short. Areola of propodeum pentagonal. Fore wing subhyaline. Body pale. Body length 2.0– 2.3 mm.— Vietnam ............... N. (N.) curvicaudis (Belokobylskij, 1994)

- Scapus 1.4 × longer than its maximum width, with sparse and short setae on its apical margin. Temple shorter, transverse diameter of eye twice longer than temple (dorsal view). Median lobe of mesoscutum anteriorly rather distinctly convex. Ovipositor with rather distinct subbasal ventral excise. Widened apical part of ovipositor sheath long. Areola heptagonal. Fore wing distinctly infuscate. Body dark. Body 2.0 length mm.— Christmas Island ............... N. (N.) insularis Belokobylskij, 2006