Key to species of Brounea gen. nov.

* The key is based on male specimens because female specimens of several species are indistinguishable using external morphology. Identities of females may be narrowed to several possibilities based on external, non-sexual characters.

1 Larger body, length 2.1–2.4 mm; frontal sulcus deep and inversely keyhole-shaped (Figs. 2 a, 3l).......... B. setiventris (Broun)

- Smaller body, length <2.1 mm; frontal sulcus shallow and elongate or oval (Figs. 2 b–k).................................. 2

2 (1) Frontal rostrum fused, inverted heart-shaped........................................... B. mangamukaensis sp. nov.

- Frontal rostrum not fused, lobes separate....................................................................... 3

3 (2) Body small, length <1.4–1.5 mm ........................................................................... 4

- Body larger,> length 1.6 mm ........................................................................... 5

4 (3) Eye small, one-third length of temple (Fig. 2 d); male head weakly swollen ventrally (Fig. 2 o); elytra longer than wide (Fig. 1 d); hind wings well-developed............................................................ B. chorui sp. nov.

- Eye larger, one-half length of temple (Fig. 2 k); male gula with heart-shaped depression bearing dense setae (Fig. 2 v: arrow); elytra as long as wide (Fig. 1 k); hind wings reduced to small pads................................ B. seungili sp. nov.

5 (3) Male abdominal sternite VI or VII with setose depression at middle (Figs. 3 p–q).................................. 6

- Male abdominal sternite VI and VII unmodified............................................................. 7

6 (5) Male abdominal sternite VII with setose depression at middle (Fig. 3 p); ventral surface of male head unmodified (Fig. 2 p)..................................................................................... B. sungryongi sp. nov.

- Male abdominal sternite VI with setose depression at middle (Fig. 3 q); male gula with triangular depression bearing dense setae (Fig. 2 r: arrow)................................................................... B. seongmoi sp. nov.

7 (6) Male gular depression without dense setae (Figs. 2 m–n)..................................................... 8

- Male gular depression bearing dense setae (Figs. 2 q, 2s, 2u).................................................. 9

8 (7) Head as long as wide, male head swollen ventrally (Fig. 2 m); eye of both sexes one-half length of temple (Figs. 2 b, 2m)........................................................................................... B. tenuis (Broun)

- Head weakly transverse, male head unmodified (Fig. 2 n); male eye as long as temple (Figs. 2 c, 2n), female eye smaller, one- half length of temple.................................................................... B. yoonhoi sp. nov.

9 (7) Elytra as long as wide (Fig. 1 j); hind wings reduced to small pads; known from Three Kings Islands (Fig. 5: white circle)........................................................................................ B. sunjaei sp. nov.

- Elytra longer than wide (Figs. 1 f, 1h); hind wings well-developed; known from North Island......................... 10

10 (9) Eye larger, two-thirds length of temple (Figs. 2 f, 2q); antennomeres 4–8 longer than wide; male head weakly swollen ventrally, gular depression bearing dense setae (Fig. 2 q: arrow)....................................... B. mijeongae sp. nov.

- Eye large, one-half length of temple (Figs. 2 h, 2s); antennomeres 4–8 as long as wide; male gula with round depression bearing dense setae (Fig. 2 s: arrow).............................................................. B. daehyuni sp. nov.