Stenchaetothrips bambusae ( Shumsher, 1946 )

Ng, Y. F. & Mound, L. A., 2015, Species of Thripinae (Thysanoptera) from bamboo in Malaysia, with one new species and six new records, Zootaxa 3918 (4), pp. 492-502 : 498

Stenchaetothrips bambusae ( Shumsher, 1946)

( Figs 26–30 )

Female macroptera. Body bicoloured; head shaded, dorsal posterior margin pale, thoracic segments pale; abdominal segments I–II pale, segments III–X gradually darker; legs pale; antennal segment I variable pale to lightly shaded, II–IV yellow, IV sometimes slightly shaded at extreme apex, V light brown on distal half, VI–VII uniformly brown ( Fig. 27 ); fore wing gradually shaded towards apex. Head about as long as wide; ocellar setae II at least 1.5 times as long as setae III; post-ocular setae I and III (longest), V and VI long, II and IV minute ( Fig. 26 ). Pronotum with 20–22 discal setae, and weak, widely spaced transverse striations; 2 pairs of long posteroangular setae, 3 pairs of posteromarginal setae. Mesonotum with anterior campaniform sensilla. Metanotum with closely spaced striations, campaniform sensilla present, median setae arising behind anterior margin ( Fig. 28 ). Meso- and metafurca each without a spinula; metasternum with about about 10–12 discal setae ( Fig. 29 ). Abdominal tergites V–VIII with paired ctenidia; I–VII posterior margin laterally with a few weakly dentate microtrichia; tergite VIII with complete comb ( Fig. 30 ); submedian and median setae on VIII sub-equal and short, not extending beyond posterior margin; IX with 2 pairs of campaniform sensilla. Sternites smooth, posterior margins without dentate craspedum, with 3 pairs of relatively long posteromarginal setae, median posteromarginal setae on segment VII arising in front.

Male macroptera. Colour of body, legs and antennae similar to female; tergites I–VIII posterior margin laterally with 2–3 weakly dentate microtrichia; tergite VIII without comb of microtrichia; sternites III–VII with oval pore plates, pore plates reaching submedian posteromarginal setae.

Material studied. Malaysia, Selangor, Kajang, 3 females from Bambusa sp., 8.xi.2012, 4 females, 2 males, 15.xi.2013, one female, 2 males, 15.xii.2013 (NG, Y.F.), in CISUKM and ANIC.

Comments. This species was interpreted by Bhatti (1982) as lacking laterally directed teeth on the posterior margin of the abdominal tergites, although specimens identified as bambusae by Ananthakrishnan and now in the collection of the Natural History Museum, London, have two or three translucent teeth near the lateral margin of the tergites ( Mound 2011). The specimens listed above as a new record of bambusae from Malaysia similarly have minute microtrichia-like teeth laterally on segments I–VII in both sexes.

Figures

FIGURES 26 – 30. Stenchaetothrips bambusae. (26) Head and pronotum; (27) Antenna; (28) Mesonotum and metanotum; (29) Mesosternum and metasternum; (30) Abdominal tergites VII – IX.