Scirtothrips species

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.