Key to Aphidius species in Iran (based on adult females)

1 Anterolateral area of petiole rugose (Fig. 58) ............................................................ Aphidius ervi Haliday

- Anterolateral area of petiole costate (Fig. 59) or costulate (Fig. 60)...........................................................2

2 Anterolateral area of petiole costate (Fig. 59).............................................................................................3

- Anterolateral area of petiole costulate (Fig. 60)..........................................................................................4

3 Antenna 15-segmented; metacarpus as long as or slightly shorter than pterostigma length (Fig. 26); labial palpus with two palpomeres (Fig. 3) ................................................................. Aphidius colemani Viereck

- Antenna 16–17-segmented; metacarpus about half of pterostigma length (Fig. 38); labial palpus with three palpomeres (Fig. 6) ..................................................................................... Aphidius transcaspicus Telenga

4 Labial palpus with two palpomeres (Figs. 1, 4, 5).......................................................................................5

- Labial palpus with three palpomeres (c.f. Fig. 2)........................................................................................8

5 Maxillary palpus with four palpomeres.......................................................................................................6

- Maxillary palpus with three palpomeres; when one palpus has four palpomeres, other palpus bears trace of two palpomeres (Fig. 5)...............................................................................................................................7 6 Metacarpus short, 0.5–0.7X as long as pterostigma length (Fig. 24); flagellomere 1 3.5–3.8X as long as its width (Fig. 7); ovipositor sheath slender and elongate with parallel dorsoventral lines (Fig. 61) ................ .......................................................................................................................... Aphidius absinthii Marshall

- Metacarpus very short, 0.15–0.2X as long as pterostigma length (Fig. 32); flagellomere 1 3.8–4.1X as long as its width (Fig. 15); ovipositor sheath short with convergent dorsoventral lines (Fig. 69)................ ................................................................................................................................... Aphidius popovi Starý

7 Antennae 14–15-segmented; pterostigma elongately triangular, as long as metacarpus (Fig. 30); ovipositor sheath short (Fig. 67) ................................................................................ Aphidius matricariae Haliday

- Antennae 16–17-segmented; pterostigma widely triangular, 1.9–2.4X as long as metacarpus (Fig. 31); ovipositor sheath elongate (Fig. 68) .................................................. Aphidius persicus Rakhshani & Starý

8 Tentorial index 0.6–0.8; face densely pubescent (Fig. 2)............................................................................9

- Tentorial index <0.6; face sparsely pubescent with glabrous middle area................................................10

9 Antennae 19–20-segmented ................................................................................ Aphidius cingulatus Ruthe

- Antennae 14–15-segmented ............................................................................... Aphidius setiger Mackauer

10 Antennae 13–14-segmented ................................................................................... Aphidius salicis Haliday

- Antennae with more than 14-segments......................................................................................................11

11 Ovipositor sheath elongate and strongly prominent (Fig. 66) ......................... Aphidius funebris Mackauer

- Ovipositor sheath broad (Figs. 64, 70, 71, 74, 76, 77)..............................................................................12

12 Antennae 16–18-segmented.......................................................................................................................13

- Antennae 19–20-segmented.......................................................................................................................16

13 Metacarpus 0.50–0.55 as long as pterostigma length (Fig. 34); antennae 17–18-segmented ....................... ................................................................................................................................. Aphidius rosae Haliday

- Metacarpus longer than 0.75 pterostigma length (Figs. 33, 39, 40); antennae 16–17-segmented............14

14 Pterostigma widely triangular, 2.8–3.1X as long as its width (Fig. 40) Aphidius uzbekistanicus Luzhetzki

- Pterostigma narrowly triangular, 3.3–3.9X as long as its width (Figs. 33, 39).........................................15

15 Antennae 16–17-segmented; ovipositor sheath widening sharply toward base (Fig. 70); pterostigma slightly longer than metacarpus (Fig. 33) ...................................... Aphidius rhopalosiphi De Stefani-Perez

- Antennae 17–18-segmented; ovipositor sheath widening weakly toward base (Fig. 76); pterostigma equal to or slightly shorter than metacarpus (Fig. 39) .................................................... Aphidius urticae Haliday

16 Pterostigma 1.8–2.1X as long as metacarpus (Fig. 27) .................. Aphidius eadyi Starý, González & Hall

- Pterostigma 1.3–1.5X as long as metacarpus (Fig. 37) .................... Aphidius smithi Sharma & Subba Rao