The Lonchaeidae of Fiji (Diptera: Schizophora) Author Macgowan, Iain text Zootaxa 2014 3814 4 537 552 journal article 45516 10.11646/zootaxa.3814.4.6 24194f46-a12d-4d91-b19d-bf4ee041b084 1175-5326 229314 24ACFF96-090E-478D-AF03-49AAEF21897B 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