Female macropterous; body dark brown, tarsi yellow; antennal segments I-V yellow also basal half of VI. Forewing brown, with small white patch sub-basally and diffuse paler area sub-apically. Head with short, convex cheeks; occipital ridge strong and close to margin of eyes; reticulation weak on posterior collar. Antennae 8-segmented, III and IV with long apical neck, sensorium long and forked; VIII about five times as long as VII. Pronotum reticulate, with semicircular hind margin and no long setae. Metanotum with triangular area of strong sculpture. Forewing second vein with about 10 setae, first vein with about six setae at base and one or two distally. Abdominal tergites III–VII with distinctive arched sculpture; VIII with comb of long microtrichia interrupted medially; X with median split complete. Male with small circular glandular area near anterior margin on sternites VI–VIII; tergite IX with two pairs of spine-like setae followed by group of about six small tubercles.
A total of 25 species are listed in Helionothrips, mostly from the Asian region, but with three from Africa, H. spinosus from Australia, and one from South America that is possibly not congeneric (Mound & Marullo, 1996).
An Australian endemic—widespread in Eucalyptus sclerophyll forests of eastern Australia, also Lord Howe Island.
Smilax australis (Smilacaceae)
Adults and larvae are sometimes abundant on the older leaves of the scrambling vine, Smilax