Key to species of Xylodes,

subgenus Diegous from Madagascar

(See also Bellés 1988a)

1 Pronotum longer than wide............................................................................. 2

- Pronotum transverse................................................................................... 4

2 Antennae robust, antennomeres VIII–X transverse (only female known, Fig. 10)............. X. (D.) elongatus (Pic, 1896)

- Antennae slender, all antennomeres longer than wide......................................................... 3

3 Pronotum with a deep excavation around the discal part. Aedeagus with simple slender and filiform parameres, median lobe increasing towards the apex (Figs 11, 16)....................................... X. (D.) excavaticollis Bellés, 1987

- Pronotum without a deep excavation around the discal part.Aedeagus with very complex parameres, showing acute prolongations on the inner side, median lobe rounded at the apex (Figs 13, 18)........................... X. (D.) pauliani (Pic, 1953)

4 Antennae with the last three antennomeres very broad, but longer than wide, dark, almost black; aedeagus with very slender parameres longer than wide (Figs 9, 15)................................................ X. (D.) caroli (Pic, 1896)

- Antennae with the last three antennomeres strongly filiform, testaceous, like the other antennomeres; aedeagus with robust parameres........................................................................................... 5

5 Elytra pubescence scaly, very dense, arranged to irregular wide stripes on the basal third and irregular spots on postmedial part; aedeagus with obtuse angled parameres and longer median lobe extending beyond the dorsal plate (Figs 12, 17)......................................................................................... X. (D.) lineatus (Pic, 1896)

- Elytra with two types of pubescence, the first from erect hairs, the second scaly, arranged to small isolated white spots..... 6

6 Each elytron with 7 spots. Aedeagus robust, oval. Parameres regularly curved inwards, covered with distinct setae along entire length of outer side. Median lobe wide, distinctly shorter than length of parameres, truncated apically (Figs 14, 19).................................................................................... X. (D.) soarezicus (Pic, 1896)

- Each elytron with 5 spots. Aedeagus slender, elongated, rather rectangular. Parameres more or less straight, almost bare, covered with only short indistinct setae in apical part. Median lobe slender, nearly reaching length of parameres, extending into narrow flagellum apically (Figs 1, 6).......................................................... X. (D.) korinae sp. nov.