Revision of the Australian planthopper genus Chidaea Emeljanov with a redescription of Cixius sidnicus Stål, 1859 (Hemiptera: Auchenorrhyncha: Fulgoromorpha: Cixiidae) Löcker, Birgit Holzinger, Werner E. Zootaxa 2019 2019-11-04 4691 5 401 443 9FNJV Löcker & Holzinger, 2019 Löcker & Holzinger 2019 [151,348,441,468] Insecta Cixiidae Chidaea Animalia Hemiptera 32 433 Arthropoda species wilarra sp. nov.  ( Figs 16, 30, 31D) Zoobank Registration: http://zoobank.org/ urn:lsid:zoobank.org:act: 49CCCC44-4D5F-4EB8-865B-460910583956  Types.   Holotype, ♂,  AUSTRALIA, NSW: Barren Ground[s],  16.xi.1958( C.E. Chadwick) ( ASCU ASCT00180039).  Paratypes, NSW:  1 ♂, same data as holotype ( ASCU);  1 ♂, Clyde Mountain(near top of highway pass),  28.xii.1994( A. Sundholm, R. De Keyzer) ( ANIC).   Etymology.The term ‘wilarra’ means ‘moon or crescent’ in Yindjibarndi, an Aboriginal language spoken in Western Australia( Thieberger & McGregor 1994). Named after the crescent-shaped aedeagal spines.  Colour.Entire specimen with a reddish brown tinge. Vertex mid or dark brown with slightly paler carinae. Frons mid brown, slightly darker near frontoclypeal suture; carinae concolorous or only slightly paler. Post- and anteclypeus darker than frons, dark brown to black with concolorous carinae. Pronotum light brown to reddish brown. Mesonotum slightly darker than pronotum, mid brown with concolorous carinae. Forewings light brown, tubercles and veins concolorous light brown. Legs and body light brown.  Morphology.Body length: ♂ 5.9–6.6 mm.   FIGURE 16.  Chidaea wilarra: A habitus; B–D head. Head: Vertex 2.2–2.3 x wider than long; median carina of vertex covering 1/3–3/4 of basal compartment of vertex; absent in apical compartment. Frons 1.0–1.1 x longer than wide; position of maximum width distinctly dorsad of centre of frontoclypeal suture; lateral carinae of frons in facial view convex, rectilinear apically or convex, evenly rounded. Frontoclypeal suture strongly semicircular, bent upwards, median part just or just not reaching lower margin of antennal scape. Postclypeus with median carina well developed. Anteclypeus with median carina moderately developed or evanescent. Rostrum reaching hind coxae. Thorax: Hind margin of pronotum obtusely angled or rectangular. Mesonotum with median carina moderately developed, evanescent near posterior end; lateral carinae moderately developed. Forewing 3.3–3.5 x longer than wide; concavity at costal border absent; costal margin with 24–25 tubercles; fork of ScP+RA and RP basad of fork CuA1 and CuA2; tubercles of forewing dark or pale, concolorous with veins; ScP+RA apically bifid or unforked; RP trifid; additional subapical cell between branches of MP1 and MP2 absent; MP1+2 and MP3+4 trifid; 12 apical cells; 6 subapical cells. Hind leg: tibia with 6 apical spines; 1  sttarsomerewith 8 apical teeth and no platellae; 2 ndtarsomere with 10 apical teeth and 8 platellae.   FIGURE 17.  Chidaea algida: A aedeagus left lateral; B aedeagus ventral; C aedeagus right lateral; D–E anal tube; F–G genital styles.   FIGURE 18.  Chidaea armidalensis: A aedeagus left lateral; B aedeagus ventral; C aedeagus right lateral; D–E anal tube; F–G genital styles.   FIGURE 19.  Chidaea belairensis: A aedeagus left lateral; B aedeagus ventral; C aedeagus right lateral; D–E anal tube; F–G genital styles.   FIGURE 20.  Chidaea bobadeenensis: A aedeagus left lateral; B aedeagus ventral; C aedeagus right lateral; D–E anal tube; F–G genital styles. Male genitalia: Anal tube as in Figs 30D–E. Pygofer and genital styles as in Figs 30F–G. Aedeagus ( Figs 30A–C): Phallotheca narrow, near base with a bifurcate ventral process on a prominent stalk that is strongly curved in lateral view; phallotheca left laterally with a medium sized, strongly curved (sickle-shaped) spine (a) that is partly concealed by the phallotheca in ventral view; phallotheca with a slightly longer, strongly curved (sickle-shaped) spine (b) that arises ventro-laterally. Aedeagal spines not reaching bifurcate ventral process.   Diagnosis.  Chidaea wilarrashares the following combination of characters with  Ch. armidalensis,  Ch. dickinsonorum,  Ch. dayiand  Ch. pulyonna: absence of platellae on the first hind tarsomere and tubercles on the forewing that are concolorous with veins. See diagnosis section of  Ch. dayiand  Ch. pulyonnafor details on how to differentiate these species from  Ch. wilarra. Both,  Ch. wilarraand  Ch. dickinsonorumhave spine (b) arising a little bit further down the aedeagus shaft (closer to base of aedeagus) than spine (a) and its tip also reaching further down. This gives the aedeagus an asym- metrical appearance which resembles a person with uneven shoulders. These two species can be distinguished by the curvature of spine (b): in  Ch. wilarraboth spines are about equally strongly curved, whereas in  Ch. dickinsonorumspine (a) is strongly curved whilst spine (b) is almost straight in lateral view. These species also differ in the insertion of spine (b): in  Ch. wilarraspine (b) arises ventro-laterally, in  Ch. dickinsonorumlaterally.   Distribution:NSW. 2446790600 [232,1433,584,612] 1958-11-16 ASCU C. E. Chadwick Australia Barren Ground 32 433 ASCT00180039 1 1 holotype 2446790598 [355,753,621,647] 1958-11-16 ASCU C. E. Chadwick Australia Barren Ground 32 433 1 1 paratype 2446790599 1994-12-28 ANIC A. Sundholm & R. De Keyzer Australia Clyde Mountain 32 433 1 1 paratype