Extant Diallactiini, including new taxa

Key to genera (males)

1 Costa extends beyond R5. Flagellomeres 11....................................................... Sylvenomyia

- Costa merged with R5 (Fig. 10D). Flagellomeres 14, exceptionally 13........................................... 2

2 M1+2 present. R-m discrete............................................................................. 3

- M1+2 absent. R-m merged in btv (Fig. 10D)................................................................ 4

3 M4 absent. Flagellomeres with crenulate whorls of sensory hairs........................................ Diallactia

- M4 present. Flagellomeres without crenulate whorls (Fig. 21C).......................................... Wyattella

4 Gonostylus normal-sized, single-lobed and with normal-sized apical tooth (Fig. 4A)............................... 5

- Gonostylus variously modified (Figs 3A, 11A, 15A, 17A, 18A)................................................ 9

5 Gonocoxae with dorsomedial process (Fig. 20A)..................................................... Wahabia

- Gonocoxae without process............................................................................ 6

6 Legs bicolored, either banded or tarsi brighter than other segments. Palpus usually longer than head height. Mostly large spe- cies with body lengths> 2.5 mm ......................................................................... 7

- Legs unicolored. Palpi usually shorter than head height. Mostly small species with body lengths <2.5 mm .............. 8

7 Wing with dark spot on Rs and surrounding membrane (Fig. 10D), a similar spot often on CuA. Membrane often milky white (almost invisible in balsam-mounts). Legs usually conspicuously banded.................................. Haplusia

- Wing without spots, but Rs usually darkly tinted (Fig. 14D). Membrane brownish to grayish. Legs never banded................................................................................................... Johnsonomyia

8 Tegmen pointed apically..................................................................... Ferovisenda

- Tegmen blunt-ended, concave or rounded apically............................................... Gynapteromyia

9 Parameres separated from each other, forming a pair of excessively long sticks (Fig. 11B)................... Japoplusia

- Parameres fused to form a tegmen (Fig. 13A)............................................................. 10

10 Gonostylus single-lobed, either miniaturized or enlarged.................................................... 11

- Gonostylus bilobed, rather normal-sized................................................................. 12

11 Gonostylus tiny, embedded in large gonocoxal lobe (Fig. 18A)........................................ Mikrostyles

- Gonostylus large (including an excessively long curved tooth), inserted posterior to gonocoxa (Fig. 17A)...... Makrostyles

12 Ejaculatory apodeme very short, rod-like (Fig. 15A)................................................ Loboplusia

- Ejaculatory apodeme excessively large, strongly broadened apically (Fig. 3A).......................... Bruneiplusia