Diomma Motschulsky, 1863

Cao, Yanghui, Dmitriev, Dmitry A. & Zhang, Yalin, 2018, New species of the leafhopper genera Kusala Dworakowska and Diomma Motschulsky (Hemiptera: Cicadellidae: Typhlocybinae: Erythroneurini) with description of a new subgenus, Zootaxa 4514 (2), pp. 263-272 : 269

Diomma Motschulsky, 1863

Diomma Motschulsky, 1863: 102 ; Dworakowska, 1981b: 364; Chiang & Knight, 1990: 199; Song & Li, 2011b: 58

Platytettix Matsumura, 1932: 104

Zyginoides Matsumura, 1932: 106 ; Dworakowska, 1972: 857

Platytetticis Strand, 1942: 393

Pakeasta Ahmed, 1971: 188

Type species: Diomma ochracea Motschulsky, 1863

Description. Body medium sized, depressed. Ground color pale to yellowish-brown with dark patches and smoky areas forming symmetrical pattern as in Kusala Dworakowska. Crown fore margin rounded or angulately produced, head as wide as or slightly wider than pronotum, face flat in profile, anteclypeus of male broad, lorum small. Forewing venation with second apical cell narrowest, third apical cell sometimes petiolate, fourth apical cell not extended to tip of wing, about half length of third, MP''+CuA' straight or slightly curved basally; AA and AP visible or not. Hind wing with submarginal vein (av) reduced to various extent, usually both basally and apically, CuP’’ absent or present, but not connected with av, RA vein usually present.

Male 2S abdominal apodemes long and moderately broad, extended to sternite IV–V. Anal tube short, without or with poorly developed appendages.

Male genital capsule depressed and well sclerotized, pygofer lobe with well developed setosity on distal half, usually with some macrosetae in central area or near dorsal margin, numerous fine setae and microsetae on lower and caudal area; dorsal appendage lamellate, short, fused to lobe basally; ventral appendage absent. Subgenital plate short and broad, nearly triangular, with row of macrosetae near outer margin and row of microsetae along outer margin. Style stout, apical part short to long, slim to broad, preapical lobe distinct. Connective V-shaped or Yshaped, central lobe absent. Aedeagal shaft tubular, with or without process; dorsal apodeme well developed; preatrium rudimentary to long, without process or with single process far from shaft; gonopore usually terminal.

Diagnosis. This genus is closely related to Kusala Dworakowska , but can be easily distinguished by the reduced submarginal vein of the hind wing. It contains three subgenera: Diomma Motschulsky, 1863 , Bunyipia Dworakowska, 1972 and Dilobonota Dworakowska, 1972, which show remarkable differences in wing venation. The nominate subgenus, distributed in Oriental region, has CuP’’ absent on the hind wing. Diomma (Bunyipia) , consisting of two Australian species, has CuP’’ long and av shorter in the hind wing. The Afrotropical subgenus Diomma (Dilobonota) has the third apical cell of the forewing petiolate, CuP’’ short and av shortest in the hind wing.

Distribution. Bangladesh; China; India; Indonesia; Japan; Malaysia; Nigeria; Papua New Guinea; Sri Lanka; Sudan; Thailand.