EMPOASCINI, Distant, 1908

Webb, Michael D. & Xu, Ye, 2022, Review of the “ red ” Empoascini leafhoppers in the genera Baguoidea Mahmood, 1967, Dayus Mahmood, 1967 and Homa Distant, 1908 (Hemiptera, Cicadellidae, Typhlocybinae) from Asia and the West Pacific, Zoosystema 44 (22), pp. 549-563 : 562

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

Figures

FIG. 1. — Baguoidea Mahmood,1967 and Homa Distant,1908 species:A-F, Baguoidea rufa (Melichar,1903),A, B, paratype of B.rubra Mahmood,1967,A, dorsal habitus, B, labels; C, D, holotype of B. rubra Mahmood, C, male genitalia (on mount), D, fore and hind wings on mount; E, dorsal habitus (non-type: Myanmar); F, labels of same;G-I, Homa insignis Distant, 1908 (lectotype), G, dorsal habitus;H, fore and hind wings on mount; I, labels;J-K, Homa katoi Dworakowska, 1984 (paratype), J, dorsal habitus, K, labels; L-M, Homa haematoptila (Kirkaldy, 1906) (holotype), L, dorsal habitus, M, labels. Scale bars: A, L, 1 mm; E, G, J, 2 mm.

FIG. 2. — Dayus Mahmood, 1967 species: A-F, Dayus euryphaessus (Kirkaldy,1907),A, B, holotype,dorsal habitus and labels respectively;C-F, types Empoasca euryphaessa rubrocincta Linnavuori,1960, C, D, allotype,dorsal habitus and labels respectively,E, F, holotype,dorsal habitus and labels respectively;G-N, Dayus upoluanus (Osborn,1934),G, dorsal habitus of female paratype;H, labels of same; I, male basal dorsal apodemes;J, male pygofer,lateral view;K subgenital plate, ventral view; L, Xth segment, ventral view; M, aedeagus, lateral view; N, aedeagus, connective and style, ventral view. Scale bars: A, C, E, 0,75 mm; G, 2 mm.

FIG. 3. — Baguoidea rufa (Melichar, 1903) (from types of junior synonym, B. yunnanensis Qin & Zhang, 2010): A, Head and thorax, dorsal view; B, face; C, forewing;D, hind wing;E, male pygofer, lateral view; F, male pygofer, dorsal view; G, male pygofer internal process;H, style; I, aedeagus and connective, lateral view; J, same, ventral view; K, male anal tube, lateral view; L, subgenital plate; M, male dorsal abdominal apodemes. Reproduced from Qin et al. (2010: figs 15-27), with permission from copyright holder.

FIG. 4. — Dayus lamellatus Qin & Zhang, 2007: A, head and thorax, dorsal view; B, face; C, male pygofer, lateral view; D, aedeagus and connective, lateral view; E, aedeagus and connective,ventral view;F, male abdominal apodemes of third tergite (upper) and 8th sternite (lower);G, style; H, male pygofer internal process; I, subgenital plate, ventral view; J, male anal tube process, lateral view. Reproduced from Qin & Zhang (2007, figs 22-29), with permission from copyright holder.

FIG. 5. — Homa sinensis Qin & Zhang, 2011: A, head and thorax, dorsal view; B, same lateral view; C, face; D, forewing; E, hind wing; F, male genital capsule, lateral view; G, male pygofer, dorsal view; H, male pygofer, lateral view; I, male basal abdominal apodemes; J, male anal tube process, lateral view; K, aedeagus and connective, dorsal view; L, aedeagus and connective, lateral view; M, subgenital plate, ventral view; N, style. Reproduced from Qin et al. (2011, figs 1-13), with permission from copyright holder.

FIG. 6. — Male genitalia of Homa insignis Distant, 1908 from Thailand specimen: A, genital capsule; B, pygofer, lateral view;C, pygofer, dorsal view;D, anal tube, lateral view; E, aedeagus and connective, lateral view; F, aedeagus and connective, ventral view; G, subgenital plate, lateral view; H, style. Reproduced from Xu et al. (2022, figs 38-45) (as H. haematoptilus, misidentification), with permission from copyright holder.