Biltothrips perakensis

Y. F. Ng & L. A. Mound, 2016, Two new species of Scirtothrips genus-group (Thripidae) of Northern Peninsular Malaysia, Zootaxa 4088 (1), pp. 141-145 : 142

Biltothrips perakensis s p.n.

( Figs 1–8 )

Female macropterous. Body pale with brown markings, head anterior margin and ocellar triangle brown, pronotum with patches of brown markings medially and laterally; all legs pale, except some slightly shaded on outer surface; antennal segment I pale, II slightly shaded, III–VIII uniformly brown ( Fig. 3 ); fore wing including clavus uniformly light brown, except extreme apex slight pale ( Fig. 6 ); abdominal tergites III–VIII including antecostal ridges shaded with lateral thirds paler; all abdominal sternites pale but IV–VI with antecostal ridge strongly shaded.

Head with ocellar setae I present, arising in front of fore ocellus in a transverse line with II; III arising outside ocellar triangle; postocular setal pairs I and II arise behind hind ocelli, pairs III and IV near posterior margin of eyes; mouthcone not extending beyond posterior margin of pronotum; compound eyes with pigmented ommatidia ventrally. Antennal segment II with inner dorsal apical seta short, with six rows of microtrichia dorsally but none ventrally; III–VI with 4 to 5 rows of microtrichia on both surfaces. Pronotum wider than long, with about 22 fine setae, uniformly and closely transversely striate; 3 pairs of posteromarginal setae ( Fig. 2 ). Mesonotum with close transverse striae; no anterior CPS, median setae arising at middle, submedian setae arising at posterior margin. Metanotum anterior half with few weak transverse striae, posterior half weakly reticulate, without CPS ( Fig. 2 ). Ferna almost attaching medially. Mesosternum with about 16 fine setae; metasternum with about 10 long and fine setae. Fore wing first vein with 3 + 5 +1 setae on basal half, 4 widely spaced setae on distal half; second vein with 3 widely spaced setae; clavus with 4 veinal and one discal setae. Tergites II–VI setal pair S1 minute, wide apart, arising postero-mesad to CPS ( Fig. 4 ); tergites VII─VIII with setal pair S1 long, subequal to and arising close to setae S2 ( Fig. 5 ); posteromarginal comb complete on VII–VIII; VIII without rows of discal microtrichia extending mesad on anterior half ( Fig. 5 ). Sternites with no discal microtrichia medially ( Fig. 7 ).

Measurements of holotype (in microns). Distended body length 920. Head, length 53; width across cheeks 120; vertex length 18–20. Pronotum median length 85; width 155. Metascutal median setae 22; submedian setae 26. Fore wing length 470. Antennal segments I–VIII length (width): 11 (21), 30 (21), 36 (19), 39 (17), 31 (15), 36 (16), 6 (7), 10 (5).

Male. Unknown

Material studied. Holotype female: MALAYSIA, Perak, Royal Belum State Park (Sg. Kejar), on Centotheca sp. [ Poaceae ] (rumput), 8–11.ix.2015 (Ng, Y.F.) (in CISUKM). Paratypes: three females collected with holotype (in CISUKM and ANIC).

Comments. The body and fore wing of this new species are more extensively brown than in minutus , from which it is further distinguished in the key above.

Figures

FIGURES 1 – 8. Biltothrips perakensis sp. n: (1) Head; (2) Pteronota; (3) Antennal segments I − VIII; (4) Abdominal tergites III – VI; (5) Abdominal tergites VI – X; (6) Fore wing; (7) Sternites IV – VII; (8) Meso- and metasterna.