Scirtothrips

Ng, Y. F., Mound, L. A. & Azidah, A. A., 2014, The genus Scirtothrips (Thysanoptera: Thripidae) in Malaysia, with four new species and comments on Biltothrips, a related genus, Zootaxa 3856 (2), pp. 253-266 : 255

Key to Scirtothrips species from Malaysia

1. Abdominal sternites II–VI with numerous rows of microtrichia extending medially across at least the posterior half of these sternites ( Figs 14 , 18 ).................................................................................. 2

-. Abdominal sternites II–VI with rows of microtrichia not extending medially but restricted to lateral areas ( Figs 25 , 32 )..... 4

2. Abdominal sternites II–VI with complete posteromarginal comb of microtrichia ( Fig. 18 ); pronotum with shaded longitudinal bands sub-laterally ( Fig 15 )................................................................... lantanae sp.n.

-. Abdominal sternites II–VI with no posteromarginal comb of microtrichia ( Fig 14 ); pronotum never with shaded longitudinal bands sub-laterally ( Figs 5 , 9 )............................................................................ 3

3. Abdominal tergites III–VII with dark antecostal ridge complete medially ( Fig. 8 ), tergites with median shading not extending to discal setae S2 ( Fig. 8 ); antennal segment I pale, II variable, III–VIII dark ( Fig. 6 ); fore wing pale apically; sternites IV–VI with microtrichia rows absent from anterior half of each segment.......................................... dorsalis

-. Abdominal tergites III–VII with dark antecostal ridge interrupted medially, tergites with shading extending broadly across segment ( Fig. 12 ); all antennal segments dark ( Fig. 11 ); fore wing uniformly dark; sternites IV–VI with microtrichia more extensive, absent only from less than anterior third of each segment ( Fig. 14 ).................................. hitam sp.n.

4. Metanotum with irregular transverse striae on anterior third, and irregular longitudinal reticulations on posterior ( Fig. 22 ); antennal segment IV almost 3.0 times as long as wide, sensorium stout and U-shaped, extending to midpoint of segment V ( Fig. 23 ); pronotal posteromarginal setae pm 2 scarcely twice as long as pm 1 ( Fig. 21 ); abdominal tergites III–VI shaded medially ( Fig. 24 )............................................................................ lixinae sp.n.

-. Metanotum with irregular reticulation, no transverse striae anteriorly ( Figs 2 , 27, 28 ); antennal segment IV usually less than 2.5 times as long as wide, sensoria slender, not extending beyond basal third of segment V ( Figs 3 , 29 ); pronotal posteromarginal setae pm2 more than 2.5 times as long as setae pm1; abdominal tergites III–VI without shaded marking medially ( Figs 4 , 30 )................................................................................................. 5

5. Fore wing second vein with 2 setae; abdominal tergites III–V with S1 closer together than their length; tergite VIII with no microtrichia extending mesad of S2 ( Fig. 4 )......................................................... dobroskyi

-. Fore wing second vein with only one seta; abdominal tergites III–V with S1 wider apart than their length ( Fig. 30 ); tergite VIII with microtrichia extending mesad of S2 or even mesad of S1( Fig. 31 ).............................. malayensis sp.n.

Figures

FIGURES 9–14. Scirtothrips hitam sp.n. (9) Head and pronotum; (10) Metascutum; (11) Antenna; (12) Abdominal tergites IV–VIII; (13) Abdominal tergites VIII–XI; (14) Abdominal sternites IV–VII.

FIGURES 15–20. Scirtothrips lantanae sp.n. (15) Head and pronotum; (16) Antenna; (17) Abdominal tergites VI–IX; (18) Abdominal sternites IV–VI; (19) Metascutum; (20) Fore wing.

FIGURES 21–26. Scirtothrips lixinae sp.n. (21) Head and pronotum; (22) Meso- and Metascutum; (23) Antenna; (24) Abdominal tergites IV–VIII; (25) Abdominal sternites IV–VII; (26) Abdominal tergite VIII.

FIGURES 27–32. Scirtothrips malayensis sp.n. (27) Head, pronotum and metascutum (Holotype); (28) Head, pronotum and metascutum (Paratype variant); (29) Antenna; (30) Abdominal tergites IV–VI; (31) Abdominal tergites VII–VIII; (32) Abdominal sternites V–VII.

FIGURES 5–8. Scirtothrips dorsalis Hood. (5) Head and pronotum; (6) Antenna; (7) Metascutum; (8) Abdominal tergites IV–VIII.

FIGURES 2–4. Scirtothrips dobroskyi Moulton. (2) Head, pronotum and metascutum; (3) Antenna; (4) Abdominal tergites VII–X.