Cixiini, Spinola, 1839

Löcker, Birgit & Holzinger, Werner E., 2019, Revision of the Australian planthopper genus Chidaea Emeljanov with a redescription of Cixius sidnicus Stål, 1859 (Hemiptera: Auchenorrhyncha: Fulgoromorpha: Cixiidae), Zootaxa 4691 (5), pp. 401-443 : 404

Key to genera of Australian Cixiini

1 Median carina of frons forked........................................................................... 2

- Median carina of frons unforked ( Fig. 5C )................................................................. 3

2(1) First hind tarsomere with 8 apical teeth and 4 setae; angle formed by hind margin of pronotum rectangular or moderately obtuse; lateral carinae of pronotum in dorsal view c-shaped, lateral parts directed towards head; vertex in midline at least twice as long as pronotum.............................................................Genus Yanganaka Löcker, 2015

- First hind tarsomere with 5–7 apical teeth and no setae; angle formed by hind margin of pronotum broadly obtuse; lateral carinae of pronotum in dorsal view s-shaped, second bend turning towards mesonotum; vertex in midline about as long as pronotum...........................................................................Genus Aka White 1879

3(1) Second hind tarsomere without platellae but with three or fewer very fine setae.................................... 4

- Second hind tarsomere with four or more platellae........................................................... 6

4(3) Apical transverse carina of vertex deeply u-shaped.............................. Genus Monomalpha Emeljanov, 2000

- Apical transverse carina of vertex v-shaped, shallowly u-shaped or almost straight.................................. 5

5(4) Basal compartment of vertex about as long as wide.................................. ‘ Iolania ’ vittipennis Muir, 1931 [Note: Iolania Kirkaldy, 1902 is a genus restricted to the Hawaiian Islands ( Hoch 2006); the generic placement of ‘ Iolania ’ vittipennis will be resolved at a later stage during this research project. ‘ Iolania ’ clypealis Muir, 1931, keys out under Leades Jacobi, 1928 , as it appears to be closely related to this genus (Löcker, 2007).]

- Basal compartment of vertex no more than half as long as wide........................Genus Leptolamia Metcalf, 1936

6(3) Second hind tarsomere with two fewer platellae than apical teeth; forewing with CuA2 reaching the margin of forewing in its entire thickness....................................................................................... 7

- Second hind tarsomere with four fewer platellae than apical teeth; forewing with CuA2 either ending well before it reaches the margin of the forewing or reaching the margin but with slightly reduced thickness............................................................................................................ Genus Calamister Kirkaldy, 1906

7(6) Male anal style about as long as 11 th segment ( Fig. 23E ). Male anal tube with ventral lobe in lateral view usually narrow near base, widening towards apex ( Fig. 23E ). Forewing with crossvein r-m 1 usually distad or at same level as fork MP1+2 and MP3+4 ( Fig. 15E , 28H ). Radius anterior (RA) forked or unforked...........................Genus Chidaea Emeljanov

- Male anal style distinctly longer than 11 th segment (11 th segment about 2/3–3/4 as long as anal style). Male anal tube with ventral lobe in lateral view tapering (widest near base). Forewing with crossvein r-m 1 usually distinctly basad of fork MP1+2 and MP3+4. Radius anterior (RA) unforked............................................... Genus Leades Jacobi, 1928

Figures

FIGURE 5. Chidaea bobadeenensis: A habitus; B–D head.

FIGURE 15. Chidaea sidnicus: A habitus and labels; B–D head; E forewing.

FIGURE 23. Chidaea dayi: A aedeagus left lateral; B aedeagus ventral; C aedeagus right lateral; D–E anal tube; F–G genital styles.

FIGURE 28. Chidaea pulyonna: A aedeagus left lateral; B aedeagus ventral; C aedeagus right lateral; D–E anal tube; F–G genital styles; H fore wing: abbreviations of longitudinal veins (black capital letters), crossveins (in italics), cell names (red letters) and other characters see chapter “Materials & Methods”.