Key to Dacrysoma species from Madagascar

(Note. dissection of genitalia is an essential prerequisite of accurate determinations)

1. Antennomere 11 longer than 9 and 10 combined (Figs. 46, 50).................................................. 2

- Antennomere 11 not longer than 9 and 10 combined.......................................................... 3

2. Lateral margins of pronotum clearly angled (Fig.67); aedeagus with a narrow, hooked tip (Fig. 96)............. dolorosum

- Lateral margins of pronotum less clearly angled (Fig. 71); aedeagus without a narrow tip (Fig. 98).............. longulum

3. Antennomere 11 not dumb-bell shaped, with only a slight median narrowing (Figs.43, 48)............................ 4

- Antennomere distinctly dumb-bell shaped.................................................................. 5

4. Lateral margins of the pronotum clearly angled (Fig. 64).............................................. denticulatm

- Lateral margins of the pronotum smoothly Rounded (Fig. 69).............................................. fabrum

5. Dark species with densely foveate and pubescent pronota (as Fig. 58)........................................... 6

- Paler species with pronota more sparsely foveate and pubescent (as Figs. 56,57)................................... 7

6. Larger, more rounded, micropterous species........................................................ nigerrimum

- Smaller, more flattened, apterous species....................................................... ranomafanense

7. Larger species 0.80–0.96 mm ............................................................................ 8

- Smaller species 0.70–0.78 mm ........................................................................... 9

8. Large (0.94–0.96 mm) dark species with distinctive genitalia (Figs. 82,83, 94). Females micropterous/ apterous... ravelosoni

- Smaller, lighter species which are very difficult to separate without examination of the male and female genitalia which are distinctive (figs. and see notes attached to species’ descriptions)..... varium, imitatum, rahanatriniainae, andasibense, fusum

9. Pubescence longer................................................................................ pilosum

- pubescence shorter................................................................................... 10

10. Pronotal foveae and pubescence denser............................................................. delicatum

- Pronotal foveae and pubescence sparser........................................................... subinsulsum