Key to Japanese species of the genus Alloplasta (female only)

1. Hind coxa partly or entirely red or yellow (Figs 1 A, 5 A, C, D, 11 A, C). Mesoscutum with a pair of lateral yellow stripes (Figs 1 A, 5 A, 11 A). Tegula and dorsal hind corner of pronotum yellow (Figs 5 A, C, 11 A). Metasomal tergites (except for posterior margins) black (Figs 1 A, 5 A, 11 A). Hind tibia without a distinct white area at base. Hind tarsus without a white band (Figs 5 A, 11 A). Length of hind TS II 5.0 × as long as maximum width. T II longer than maximum width. Ovipositor sheath longer than 1.5 × as long as hind tibia........................................................................... 2

-. Hind coxa black (e.g., Figs 2 A, 8 A, 10 A). Other character states various......................................... 3

2. Mandible black with a dorsal small yellow spot (Fig. 5 B). Clypeus at most with a yellowish brown area ventrally (Fig. 5 B). Hind coxa reddish brown with a dorsal yellow marking (Figs 5 B–D). Hind femur not darkened (Fig. 5 A). Malar space 0.4–0.45 × as long as basal mandibular width. Ovipositor sheath 1.5–1.8 × as long as hind tibia...................................................................................................... A. kuslitzkii Kasparyan, 2007

-. Mandible yellow except for black teeth (Figs 11 A, B). Clypeus with a large yellow area ventrally (Fig. 11 B). Hind coxa blackish brown with a yellow marking (Fig. 11 C). Hind femur more or less darkened (Fig. 11 A). Malar space 0.5–0.6 × as long as basal mandibular width. Ovipositor sheath 1.9–2.0 × as long as hind tibia.................. A. subgrisea Kasparyan, 2007

3. Metasomal tergites red (at least on T II and T III) (Fig. 6 A). Antenna more or less tinged with reddish brown (Figs 6 A, B). Hind femur and tibia largely reddish brown (Fig. 6 A). T I 1.3–1.5 × as long as maximum width. Ovipositor sheath 1.5–1.75 × as long as hind tibia............................................................ A. maruyamana (Uchida, 1928)

-. Metasomal tergites black (e.g., Figs 1 B, 2 A, C, 10 A). Antenna black (e.g., Figs 1 B, 2 A). Hind femur black (e.g., Figs 2 A, 3 A, 4 A). Hind tibia black or at most tinged with yellowish brown basally, usually with a basal white area (e.g., Figs 2 A, 3 A, 4 A). Length of T I and ovipositor various.................................................................... 4

4. Ovipositor sheath 1.6–1.8 × as long as hind tibia. Fore and mid femora and tibiae entirely reddish brown except for a basal white spot of mid tibia (Fig. 4 A). Hind TS II to TS V entirely or partly white (Fig. 4 A). T II longer than maximum width............................................................................................. A. japonica sp. nov.

-. Ovipositor sheath usually shorter than 1.55 × as long as hind tibia. Fore and mid femora and tibiae not entirely reddish brown (at least partly darkened) (Figs 2 A, 3 A, 8 A, 9 A, 10 A). Hind tarsus various in coloration. Length of T II various......... 5

5. Length of hind TS II 5.0–6.0 × as long as maximum width (Fig. 8 A). Posterior margin of T II to T V without a conspicuous white band (at most narrowly tinged with reddish brown) (Figs 1 B, 8 A). Face at least partly with a pair of yellow stripes along inner eye margin (Fig. 4 B). T II usually longer than maximum width. Ovipositor sheath 1.0–1.2 × as long as hind tibia............................................... A. nigripes (Meyer, 1930) (= A. longipetiolaris (Uchida, 1952) syn. nov.)

-. Length of hind TS II 2.5–4.4 × as long as maximum width (Figs 2 A, 3 A, 9 A, 10 A). Posterior margin of T II to T V with (Figs 2 A, C) or without a conspicuous white band (Figs 3 A, 9 A, 10 A). Face with or without a pair of yellow stripes along inner eye margin (Figs 2 B, 3 B, 9 B, 10 B). Length of T II and ovipositor various.......................................... 6

6. Ovipositor sheath shorter than hind tibia (0.88 × as long as hind tibia) (Fig. 3 A). Propodeum with a complete posterior transverse carina (Fig. 3 C)............................................................... A. breviterebra sp. nov.

-. Ovipositor sheath longer than hind tibia (more than 1.05 × as long as hind tibia) (Fig. 2 A, 9 A, 10 A). Propodeum with or without a complete posterior transverse carina............................................................... 7

7. Ovipositor sheath 1.7–1.8 × as long as hind tibia. Hind tarsus entirely black (Fig. 9 A). Posterior margin of T II to T V at most narrowly tinged with reddish brown to yellowish brown. Clypeus 2.3–2.6 × as broad as high. T I 1.25–1.35 × as long as maximum width. T II 0.7–0.8 × as long as maximum width........................................... A. satana sp. nov.

-. Ovipositor sheath shorter than 1.6 × as long as hind tibia. Hind tarsus with a conspicuous white area (Figs 2 A, 10 A). Posterior margin of T II to T V with various coloration. T I 1.35–1.9 (usually more than 1.4) × as long as maximum width. T II 0.75–1.05 (usually more than 0.8) × as long as maximum width......................................................... 8

8. Ovipositor sheath 1.05–1.1 × as long as hind tibia. Clypeus 2.0 × as broad as high. Face entirely black. Mesoscutum without yellow markings (Fig. 10 A). Posterior margin of T II to T V usually narrowly tinged with reddish brown to yellowish brown (Fig. 10 A). Length of hind TS II 4.0–4.4 × as long as maximum width (Figs 10 A).............. A. septentrionalis sp. nov.

-. Ovipositor sheath more than 1.4–1.6 × as long as hind tibia. Clypeus 2.6 × as broad as high. Face entirely black or partly with a pair of yellow stripes along inner eye margin. Mesoscutum with a pair of yellow markings (Fig. 2 A). Posterior margin of T II to T V usually relatively widely tinged with yellowish brown to white (Figs 2 A, C). Length of hind TS II 3.3–4.0 × as long as maximum width (Figs 2 A)................................................ A. brevipetiolaris Kang & Lee, 2020