Scirtothrips, Shull, 1909

Mound, Laurence A. & Wells, Alice, 2023, Endemism among Lord Howe IslandThysanoptera, with new species of Baenothrips (Phlaeothripidae) and Scirtothrips (Thripidae), Zootaxa 5228 (1), pp. 81-91 : 86

Key to Scirtothrips species from Lord Howe Island

1. Pronotum closely striate, striae separated by no more than base of a discal seta ( Fig. 14 ); ocellar region transversely striate, setae pair III arising close to anterolateral sides of triangle; metanotal median setae arising at anterior margin; fore wing second vein with 3–8 setae; antennal segment III more than twice as long as wide............................. albomaculatus

-. Pronotum broadly striate, striae wider apart than base of any discal seta ( Figs 15, 16 ); ocellar region without or with very weak striae, setae pair III arising between or behind midpoints of hind ocelli; metanotal median setae arising behind anterior margin ( Fig. 17 ); fore wing second vein with 4 (or 3) widely spaced setae; antennal segment III slightly less than 2.0 times as long as wide............................................................................................... 2

2. Body pale brown; tergites II–VII lateral thirds with up to 10 transverse sculpture lines each bearing many microtrichia ( Figs 18, 19 ); sternites with numerous microtrichia lateral to marginal setae pair S2 ( Fig. 20 ); ocellar triangle with no sculpture lines ( Fig. 15 )................................................................................. cyatheae sp.n.

- Body yellow, only distal antennal segments brown; tergites II–VII without microtrichia on transverse sculpture lines ( Figs 21, 22 ); sternites without microtrichia, or with a few lateral to marginal setae pair S3; ocellar triangle with faint irregular reticulation ( Fig. 16 )......................................................................... gymnos sp.n.

Figures

FIGURES 14–22. Scirtothrips species. Head & pronotum 14–16: (14) albomaculatus; (15) cyatheae; (16) gymnos. Female cyatheae 17–20: (17) Metanotum; (18) Tergites I–III; (19) Tergites VI–X; (20) Sternites VI–VIII. Female gymnos 21–22: (21) Tergites IV–VIII; (22) Tergites V–VI.