Key­­­to­­­the­­­Palearctic­­­species­­­of­­­ Dimophora

1. Larger species, fore wing length 3.3–5.0 mm. Antenna with 29 or more flagellomeres. Sub-basal cells of fore and hind wings with setae becoming gradually sparser toward base. Hind wing with 2nd abscissas of CU and AA present............... 2

- Smaller species, fore wing length 2.4–2.6 mm. Antenna with 23 or 24 flagellomeres. Sub-basal cells of fore and hind wings evenly covered with setae. Hind wing with 2nd abscissas of CU and AA absent.................................... 4

2. Tentorial pit located at level dorsad of lower margin of eye. Antenna of female bi-color, brownish yellow and black. Antenna of male entirely dark brown. Fore and mid coxae brownish yellow. 1st metasomal sternite reddish brown. Penis valve with spines weak.................................................................................. D. japonica n. sp.

- Tentorial pit located at level ventrad of lower margin of eye. Antenna in both sexes entirely black. Fore and mid coxae black. 1st metasomal sternite black. Penis valve with spines strong in nigra ............................................ 3

3. OOL/OD=0.8–1.2. Hind leg dark brown. Metasomal tergites entirely black. T2 0.6–0.8 times as long as wide. Ovipositor length about 2.0 mm.............................................................................. D. nigra n. sp.

- OOL/OD=1.6. Hind leg reddish yellow. Metasomal tergites dark brown; around apical 1/3 of T1, T2 and T3 brownish red. T2 0.4 times as long as wide. Ovipositor length about 4.0 mm................................... D. nitens (Gravenhorst)

4. Head 1.8 times as wide as face. POL/OD=1.1. Antenna with or without whitish band. Clypeus entirely black. Propodeal carina complete and distinct.............................................................. D. evanialis (Gravenhorst)

- Head 2.1–2.5 times as wide as face. POL/OD=1.8.Antenna with whitish yellow band.Apical half of clypeus brown. Propodeum with posterior 1/3–1/2 of lateral longitudinal carina of area dentipara absent............................ D. parva n. sp.