Cixiini

Löcker, Birgit, 2020, Revision of the Australian planthopper genus Monomalpha Emeljanov with the description of the new genus Latissima (Hemiptera: Auchenorrhyncha Fulgoromorpha: Cixiidae: Cixiini), Zootaxa 4858 (3), pp. 375-393 : 376-377

Key to genera of Australian Cixiini

1 Median carina of frons forked ( Löcker 2015: Figs 6C, 6E )..................................................... 2

– Median carina of frons unforked ( Figs 4C )................................................................. 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 c-shaped, lateral parts directed towards head ( Löcker 2015: Fig. 6D ); vertex in midline at least twice as long as pronotum........................................................... 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 s-shaped, second bend turning towards mesonotum ( Löcker 2015: Fig. 6B ); vertex in midline about as long as pronotum................................................................................ Aka White, 1879

3(1) Second hind tarsomere without platellae, but with three or fewer very fine setae ( Figs 3F , 6E , 7E )..................... 4

– Second hind tarsomere with four or more platellae ( Löcker 2020: Fig. 7E )........................................ 7

4(3) Apical transverse carina of vertex deeply u-shaped ( Figs 3E , 4D , 7D )............................................ 5

– Apical transverse carina of vertex v-shaped, shallowly u-shaped or almost straight ( Löcker 2020: Figs 3E , 5C , 6C , 7B , 8B ).. ................................................................................................... 6

5(4) Widest part of frons distinctly ventrad of centre of frontoclypeal suture ( Fig. 7C ); fork of CuA1 and CuA 2 in basal half of forewing ( Fig. 8 ); RP trifid ( Fig. 8 )........................................................ Latissima gen. nov.

– Widest part of frons distinctly dorsad of centre of frontoclypeal suture ( Figs 3D , 5D ); fork of CuA1 and CuA 2 in apical half of forewing ( Figs 3A , 5A, 5B ); RP unforked ( Figs 4A , 5A, 5B ) or bifid ( Figs 3A , 6A )......... Monomalpha Emeljanov, 2000

6(4) Basal compartment of vertex about as long as wide ( Löcker 2020: Figs 8B , 9B, 9E )............... Yamirrina Löcker, 2000

–. Basal compartment of vertex no more than half as long as wide ( Löcker 2014a: Fig. 4B )............................................................................................................. Leptolamia Metcalf, 1936

7(3) Second hind tarsomere with two fewer platellae than apical teeth ( Löcker 2020: Fig. 7E ); forewing with CuA2 reaching the margin of forewing in its entire thickness ( Löcker 2020: Figs 6A , 18A).......................................... 8

–. 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 ( Löcker 2014b: Fig. 1 )............................................................................................... Calamister Kirkaldy, 1906

8(7) Male anal tube with ventral lobe in lateral view narrow near base, widening towards apex. Male anal style about as long as remainder of 11th segment ( Löcker & Holzinger 2019: Fig. 23E). Forewing with crossvein r-m1 usually distad ( Löcker & Holzinger 2019: Fig. 28H) or at same level as fork MP1+2 and MP3+4. Radius anterior (RA) forked or unforked......................................................................................... Chidaea Emeljanov, 2000

– Male anal tube with ventral lobe in lateral view tapering (widest near base). Male anal style distinctly longer than remainder of 11th segment (remainder of 11th segment about 2/3-3/4 as long as anal style). Forewing with crossvein r-m1 usually distinctly basad of fork MP1+2 and MP3+4. RA unforked.............................................. Leades Jacobi, 1928

Figures

FIGURE 1: Female genitalia: A Monomalpha gratiosa; B–F Monomalpha fletcheri.

FIGURE 3. Monomalpha fletcheri: A–B habitus (A holotype); C–E head and thorax; F hind tarsi; G hind tibia.

FIGURE 4. Monomalpha gratiosa: A habitus; B–D head and thorax.

FIGURE 5. Monomalpha gratiosa (holotype). A habitus dorsal; B habitus lateral; C–E head and thorax; F hind tibiae and tarsi. Photos courtesy of Dr Olívia Evangelista (ANIC). Used with permission.

FIGURE 6. Monomalpha stenocara (holotype): A habitus; B–D head and thorax; E hind tarsi.

FIGURE 7. Latissima isleyensis (holotype): A habitus; B–D head and thorax; E hind tibia and tarsi.

FIGURE 8. Latissima isleyensis (holotype): forewing.

FIGURE 9. Monomalpha fletcheri: A aedeagus left lateral; B aedeagus ventral; C aedeagus right lateral; D–E anal tube; F–G genital styles.