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.