KEY TO THE “RED” ASIAN AND WEST PACIFIC GENERA AND SPECIES OF THE “ USHARIA GROUP” OF EMPOASCINI

Note. Two species, known only from the female, i.e., Homa haematoptilus (Kirkaldy, 1906) from Australia and Homa rubrodorsata Kato, 1933 from Taiwan, are excluded from the key pending examination of the male.

1. Forewing reddish in basal half to two-thirds (Fig. 1A, E) or with a ‘T’ shaped red mark (Fig. 2E); third apical cell petiolate (Fig. 3C); male pygofer with a ventral process; subgenital plate slightly produced basolaterally but without a distinct lobe (Figs 3L; 4I); aedeagal shaft elongate or very short .................................................... 2

— Forewing marked with red in corium basally, along clavus distally and continued across wing (Fig. 1H, J); third apical cell not petiolate (Fig. 5D); male pygofer without a ventral process; subgenital plate with a distinct basolateral lobe (Figs 5F; 6A); aedeagal shaft elongate ( Homa Distant, 1908) ..................................................... 5

— Subgenital plate basal group macrosetae truncate apically; lateral macrosetae uniseriate and few in number in basal two thirds, irregularly arranged and numerous in distal third (Fig. 3L); aedeagal shaft elongate (Fig. 3I); male 8th abdominal sternite without apodeme .............................................. Baguoidea rufa (Melichar, 1903)

— Subgenital plate basal group macrosetae acute apically, lateral macrosetae uniseriate throughout and few in number (Fig. 4I); male 8 th abdominal sternite with apodeme (Fig. 4F) ( Dayus Mahmood, 1967) ............... 3

2. Aedeagal shaft very long with a pair of apical subparallel processes (see Dworakowska & Viraktamath, 1978, fig. 36); India, China (Hainan, Taiwan and Hong Kong) ................. Dayus formosus Dworakowska & Viraktamath, 1978

— Aedeagal shaft very short without a pair of apical processes ......................................................................... 4

3. Aedeagal shaft evenly curved in lateral view (Fig. 2M); Samoa ..................... Dayus upoluanus (Osborn, 1934)

— Aedeagal shaft angularly curved in lateral view (see Linnavuori 1960: fig. 5i); Fiji .......................................... ................................................................................................................ Dayus euryphaessus (Kirkaldy, 1907)

4. Subgenital plate with latero-basal lobe narrow, with group of lateral macrosetae near midlength (Fig. 5M); China ....................................................................................................... Homa sinensis Qin & Zhang, 2011

— Subgenital plate with latero-basal lobe broad, without group of lateral macrosetae near midlength (Fig. 6G) .... 6

5. Aedeagal shaft relatively broad in lateral view (Fig. 6A); mainland Asia .............. Homa insignis Distant, 1908

— Aedeagal shaft very narrow in lateral view (see Dworakowska 1978: fig. 54); Malaysia .................................... .................................................................................................................... Homa katoi Dworakowska, 1984