Nysius, Dallas, 1852

Malipatil, M. B., 2010, Review and Revision of Nysius Dallas of Australia and South West Pacific (Hemiptera: Heteroptera: Orsillidae), Zootaxa 2410 (1), pp. 29-44 : 43-44

Key to the species of Nysius from Australia and the SW Pacific

1. Femora except apices uniformly black; (outside Australia) ......................................................................................... 2

- Femora colour otherwise .............................................................................................................................................. 3

2. Corium without long outstanding setae; spermatheca with apical sac part globose and slightly broader than subapical part; femora shiny ( Solomon Islands)............................................................................................................. femoratus

- Corium with sparse long outstanding setae; spermatheca with apical sac part globose and slightly narrower than subapical part; femora not shiny ( Micronesia) ......................................................................................................... picipes

3. Body (at least pronotum and corium) covered with long erect to semi-erect bristly setae in addition to golden yellow appressed pubescence .................................................................................................................................................. 4

- Body (at least pronotum and corium) without long erect to semi-erect setae, but only with golden yellow appressed pubescence .................................................................................................................................................................... 7

4. Pronotum with posterior lobe area almost completely pale in contrast to fuscous band on anterior lobe area; most of distal half of scutellum pale in contrast to basal half ( Jarvis Island) ............................................................ oceanicus

- Not as above................................................................................................................................................................. 5

5. Pronotum with posterior lateral margins and a large discal spot yellow; membrane with conspicuous longitudinal fuscous patch ( Micronesia) ............................................................................................................................. pulchellus

- Pronotum and membrane without the above markings ...............................................................................................6

6. Second segment of antenna at least 2 times as long as first; hemelytra with costal margin of corium beyond level of apex of scutellum, only slightly expanded before markedly narrowing towards apex (widely distributed in the study area)............................................................................................................................................................. caledoniae

- Second segment of antenna less than 2 times as long as first; hemelytra with costal margin of corium beyond level of apex of scutellum, abruptly expanded before markedly narrowing towards apex (coastal New South Wales) ............ ............................................................................................................................................................................ orarius

7. Head, pronotum, and scutellum black; legs pale yellow throughout (except for third tarsomere); femora without fuscous spots ( Christmas Island) ................................................................................................................... spectabilis

- Head, pronotum, and scutellum not entirely black; legs not pale yellow throughout; femora with fuscous spots ..... 8

8. Second segment of antenna more than 2 times as long as first (widely distributed in the study area) ............... vinitor

- Second segment of antenna less than 2 times as long as first (Tasmania)................................................ tasmaniensis