Myers.—New Zealand Plant-hoppers. 317 
After numerous attempts by Mr. Muir and myself to accommodate all 
the New Zealand species in these and other known genera, it was decided 
that, rather than stretch unduly the limits of genera already inconveniently 
crowded, it would be best to erect four new genera by means of which the 
relationships of our new forms might be better expressed. To differentiate 
these new genera Mr. Muir drew up the following key, which for a 
considerable time I have tested on large series of specimens. The genera 
have been further differentiated, and the suggested classification shown to 
be natural, by dissection of the male genitalia of all species in which males 
were procurable. 
All measurements are from apex of vertex to anus, and from base to 
apex of one tegmen. 
Key ro GENERA OF NEW ZEALAND CIXIIDAE. 
v r 
n angle and touching the anterior transverse carina Oliarus. 
f bse issing ; 
6 o n5 .. P: ^. 
7. (2.) Three notal carinae, the middle one sometimes obscure. 
8. (9.) No median longitudinal carina on face; fronto-clypeal suture 
arcuate ; clypeus swollen or roun s à .. бето. 
9. (8.) A distinct longitudinal median carina on face. 
0. (11.) A median iongitudinal carina on vertex ; clypeus fairly flat with 
a distinct ian carina is ne Р is 
11. (10.)-No median longitudinal carina on vertex ; clypeus fairly rounded 
without ian longitudinal carina. Cu, joining M34, for 
a short distance 2: у> vs з at 
12. (1.) No spines on hind tibiae, except apical ones. 
13. (14.) Vertex with a longitudinal carina forked at apex, median carina - 
n face forked or thickened on basal half .. a .. Aka. 
14. (13.) Longitudinal carina on vertex very short, not forked ; median 
frontal carina not for a P3 eee 2% 
Genus 1. Cixivs Latreille. 
Type: C. nervosus (Linn.) 
is almost cosmopolitan genus is sufficiently characterized in the 
above key. The male genitalia of the New Zealand forms are comparatively 
simple. The aedeagus is straight, with backwardly-directed hooks. ` 
Cixius punctimargo Welker. (Plate 20, figs. 1-4.) 
Walker, List Homopt. Insects in Brit. Mus. Suppl., p. 81, 1858. 
Buchanan White, Ent. Mo. Mag., vol. 15, p. 216, 1879. Hutton, 
Trans. N.Z. Inst., vol. 30, p. 186, 1898; Index Faunae : 
Zeal., p. 224, 1904. Kirkaldy, Trans. № .Z. Inst., vol. 41, p. 28, 
1909. i 
KA , 3 mm.; tegmen, 4mm. Very pale olive, the veins and 
tegmina malachite-green. Eyes brownish. Below brown; clypeus darker; 
fronto-clypeal suture black. Tegmina hyaline. Veins green, black and 
thickened at tips. Apical cross-veins black and thick. Stigma hyaline 
or whitish. Medio-ventral projection of pygophor short and sharp. Anal 
segment large. Anal style jet-black. Genital styles with stem rather 
4. Len 
