Key to the genera and species of Lonchaeidae present in Fiji

Determination of Lamprolonchaea, Lonchaea and Silba at species level can only be done at present for male specimens.

1. A single poststigmatal seta present on the anterior marginal portion of anepisternum above and slightly posterior to the anterior thoracic spiracle, frons with lateral corrugations on anterior half, a strong anterior setae present on the genae, lunule with setulae, basal tarsomeres pale......................................................... Dasiops ruidifrons

- poststigmatal seta absent, frons without lateral corrugations, strong anterior genal seta absent......................... 2

2. Lunule with setulae................................................................................... 3

- Lunule without setulae.................................................................. 4 Lamprolonchaea

3. Males - inner surface of surstyli with only setulae or setae (Fig. 12). Katepisternum with one strong dorsocentral seta..................................................................................................6. Lonchaea

- Males - inner surface of surstyli with an obvious row of prensisetae (teeth) (Fig. 30) Katepisternum with two strong dorsocen- tral setae....................................................................................... 9. Silba

4. Males - inner surface of surstyli evenly covered in fine setulae (Figs 5 & 8)...................................... 5

- Males - inner surface of surstyli with at most with a few setulae (Fig. 2). Phallus a slender curved U-shape with obvious apical knob (Fig. 3).................................................................... Lamprolonchaea gilvipata

5. Surstyli almost square in shape, usually with only 4 or 5 well separated long setulae along outer margin. (Fig. 5). Phallus stout with an asymmetrical dilated apex (Fig. 6)............................................. Lamprolonchaea lustrata

- Surstyli with an obvious anterior lobe, always more than 4 or 5 long setulae along outer margin. (Fig. 8). Phallus long and slen- der forming a rather rectangular U-shape, basal section often with denticles, apex narrow (Fig. 9)................................................................................................... Lamprolonchaea metatarsata

6. Phallus with a short apical section, (Figs. 16 & 20)........................................................... 7

- Phallus with apical section long and slender (Figs. 13 & 23).................................................. 8

7. In lateral view apical section of phallus shield-shaped (Fig. 20), apex of basal section simple, without spicules............................................................................................... Lonchaea melanesia

- In lateral view apical section of phallus tubular (Fig. 16), apex of basal section bifurcated and bearing spicules (Fig. 17)........................................................................................ Lonchaea linefacies

8. Cerci bearing thick, blade-like setae at base (Fig. 10).............................................. Lonchaea fiji

- Surstyli with a single row of long strong setulae (Fig. 22). Phallus a rectangular L-shape, weakly segmented (Fig. 23).......

....................................................................................... Lonchaea vanua 9. Phallus long, thin and curving with a characteristic angled tip (Fig 28)................................. Silba perplexa

- Phallus stouter with a basal process (Figs. 26 & 31)......................................................... 10

10. Phallus largely covered in small setulae, basal process simple (Figs. 31 & 32), calypteres greyish with dark fringe................................................................................................ Silba setiphallus

- Phallus with only a few setulae, basal process bifurcate at apex (Figs. 26 & 27), calypteres and fringe white........................................................................................................ Silba kadavu