Hercinothrips

GOLDARACENA, ARTURO & VIERBERGEN, GIJSBERTUS (BERT), 2022, A key to species of Hercinothrips, with one new species, and a neotype designation for H. trilineatus (Priesner), Zootaxa 5169 (4), pp. 322-330 : 323

Key to extant Hercinothrips species (females)

1. Head and pronotum partly or completely yellow............................................................. 2

-. Head and pronotum brown.............................................................................. 8

2. Head with anterior half yellow, posterior half brown, at least laterally; pronotum varying, brown with large yellow areas sometimes with pronounced dark brown strips but never completely yellow........................................... 3

-. Head completely yellow, or yellow with posterior brown band; pronotum yellow................................... 4

3. Antennal segments VI–VIII yellow; fore wing median pale area about 2.0 times as long as first dark cross band; metascutellum about 3.5 times as wide as long [male tergite IX with three pairs of spine-like setae medially, posterior pair slightly weaker and aligned longitudinally with anterior two pairs]....................................................... bicinctus

-. Antennal segments VI–VIII brown, fore wing median pale area small or absent; metascutellum more than 3.5 times as wide as long.......................................................................................... femoralis

4. Pronotum yellow, sometimes with lateral brown spots ( Figs 14–15 )............................................. 5

-. Pronotum yellow with three brown longitudinal lines ( Fig. 3 ).................................................. 7

5. Hind femora brown medially; fore wings with dark cross bands about as long as median pale area; mesonotum and metanotum mainly brown with yellow areas medially [male tergite IX with the posterior pair of median setae weaker and lateral from the other two median pairs]......................................................................... dimidiatus

-. Hind femora yellow; bands on fore wing various; mesonotum and metanotum deeply yellow......................... 6

6. Fore wing with two white and two dark areas well differentiated; mid and hind femora light brown, rest of legs yellow; male tergite IX with three pairs of spine-like setae longitudinally aligned....................................... pattersoni

-. Fore wing brown with white spot at base; all legs yellow; male unknown..................................... jansei

7. Fore wing base dark brown, medially without a pale area ( Fig. 20 ); mid tibia bicolored, brown at base but yellow from middle to apex; hind tibia bicolored, brown at base then yellow for 2/3 of length ( Fig. 21 ); metanotum usually with campaniform sensilla between main setae ( Fig. 22 ) male unknown........................................................ trilineatus

-. Fore wing base with white band reaching to costal vein ( Fig. 11 ), basal vein with brown area medially; mid and hind tibiae completely yellow ( Fig. 18 ); metanotum usually with campaniform sensillae lateral to metanotal setae ( Fig. 23 ); male tergite IX with distance between posterior pair of spine-like setae about 1.5 times the distance between median setal pair................................................................................................. splendens n. sp.

8. Hind tibiae bicolored, mainly brown medially with one or two pale areas in the apical and basal part ( Fig. 17 )..... H. tenuis

-. Hind tibiae golden yellow ( Fig. 18 )...................................................................... 9

9. Fore wing median pale area less than half length of first dark cross band; metascutellum no more than 4.5 times as wide as long; tergite VIII comb lateral teeth short, no more than 2.0 times as long as distance between them ( Fig. 16 ); male tergite IX with median spine-like setae much stronger than two postero-lateral pairs...................................... aethiopiae

-. Fore wing median pale area longer than first dark cross band; metascutellum more than 5.0 times as wide as long; tergite VIII comb lateral teeth longer, up to four times as long as distance between them ( Fig. 19 ); male tergite IX with all spine-like setae very thick..................................................................................... brunneus

Figures

FIGURES 14–23. Hercinothrips species. (14) H. jansei pronotum; (15) H. dimidiatus pronotum; (16) H. aethiopiae microtrichia comb VIII; (17) H. tenuis hind tibia; (18) H. splendens tibia; (19) H. brunneus microtrichia comb VIII; (20) H. trilineatus wing; (21) H. trilineatus tibia; (22) H. trilineatus metanotum; (23) H. splendens metanotum

FIGURES 1–8. Hercinothrips splendens n.sp. (1) Habitus female; (2) Head; (3) Pronotum; (4) Head and Pronotum; (5) Tergite I; (6) Tergite II; (7–8) Antennal segments III–VIII.

FIGURES 9–13. Hercinothrips splendens n.sp. (9) Tergites IX–X; (10) Metanotum; (11) Fore wing; (12) Leaf feeding damage on Aloe sp. caused by H. aethiopiae in Holland; (13) Aloe plants attacked by H. splendens in greenhouse in Holland.