Key to the world species of Erythrodolius ( Ichneumonidae: Sisyrostolinae)

1. Propodeum with area superomedia not surrounded by carinae, with only the posterior transverse carina present medially (Fig. 10)................................................................................................. 2

- Propodeum with area superomedia bordered by at least the posterior transverse carina and strong to weak vestiges of the medial, longitudinal carinae (Figs 9, 11, 12) (anterior transverse carina present or absent medially)..................... 3

2(1). Clypeus medially with a long, strong, sharply pointed tooth that is well-defined by carinae from the lateral parts of the clypeus......................................................................... E. granulosus Seyrig (Madagascar)

- Clypeus medially with a short, rounded tooth that is not defined laterally by carinae (Fig. 6)................................................................................................ E. incompletus sp. n. (Guatemala)

3(1). Mesoscutum predominantly dark brown, either completely or with a small amount of lighter colour near notauli and mediopos- teriorly (Fig. 16). Fore wing with membrane uniformly coloured, without a dark region apically (Figs 1, 4).............. 4

- Mesoscutum predominantly light coloured (brownish yellow, orange or brownish red). Fore wing with membrane with or with- out a dark region apically (Figs 2, 3)...................................................................... 5

4(3). Frons (Fig. 5), scutellum and hind femur (Fig. 1) predominantly brownish yellow. Propodeum with medial abscissa of anterior transverse carina present or absent................................... E. griffithsorum Gauld (Costa Rica, Nicaragua)

- Frons (Fig. 8), scutellum, and hind femur (Fig. 4) completely dark brown. Propodeum with medial abscissa of anterior trans- verse carina present......................................................... E. tenebrosus sp. n. (Mexico)

5(3). Clypeus without a medial tooth on apical edge, but with about six, low crenulations instead........................... 6

- Clypeus with a medial tooth on apical edge or at least slightly protruding medially, but without crenulations (Figs 5–8)..... 7

6(5). Fore wing with a well-defined brown spot apically and a second brown region more basally, surrounding veins Rs&M and cu-a......................................................................... E. speciosus Seyrig (Madagascar)

- Fore wing slightly darkened apically relative to base, but without a well-defined brown spot and lacking any dark area around veins Rs&M and cu-a........................................................ E. formosus Seyrig (Madagascar)

7(5). Propodeum with the lateral abscissae of the anterior transverse carina (costula) absent or weak (as in Fig. 10)............. 8

- Propodeum with lateral abscissae of anterior transverse carina present and strong (Fig. 11)............................ 9

8(7). Fore wing hyaline basally with a well-defined dark region apically (as in Fig. 3)........ E. meticulosus Seyrig (Madagascar)

- Fore wing completely hyaline, without a well-defined dark region apically (as in Fig. 1).... E. dolosus Seyrig (Madagascar)

9(7). Flagellum dark brown to black basally with a well-defined, medial light-coloured band and then dark apically........... 10

- Flagellum red or yellow basally, darkening apically but without a medial, light-coloured band (Fig. 3)................. 11

10(9). Fore wing darkened apically and also with two medial infumate bands, one basal to the stigma (around vein Rs&M) and one apical to it including the vein 2rs-m (intercubitus of areolet)........................ E. scrupulosus Seyrig (Madagascar)

- Fore wing with a dark spot apically, but lacking any darkened regions basally or medially (as in Fig. 3).......................................................................................... E. calamitosus Seyrig (Madagascar)

11(9). Tergites 4 to 7 dark brown. Fore wing only vaguely more infumate apically than basally (without a clearly defined dark spot)........................................................................... E. dubiosus Seyrig (Madagascar)

- All metasomal tergites orange (laterotergites 3 and 4 may be brown). Fore wing with a clearly defined dark spot apically (Fig. 3)................................................................................................. 12

12(11). Metasomal laterotergites 3 and 4 brown (Fig. 3). Ovipositor strongly upcurved and much shorter than length of metasoma.............................................................................. E. luteus sp. n. (Honduras)

- Metasomal laterotergites 3 and 4 orange. Ovipositor straight and about two times as long as metasoma............................................................................................ E. maculosus Seyrig (Madagascar)