Stenchaetothrips biformis

Body length about 1.2–1.5 mm. General body shape slender, slightly flattened. Colour: head and thorax brown, abdomen brown; antennal segments I–II dark, II paler at apex, III pale, IV slightly shaded, V–VII dark; all tibiae and tarsi pale, femora slightly shaded near base; fore wing uniformly shaded, clavus strongly shaded. Head with postocular setae I variable (present or absent, often absent in males), when present longer than pair II and subequal to pair III, usually as long as distance between hind ocelli; postocular setae III much longer than I. Antennae 7-segmented; segments III and IV without distal neck; segments IV and V length/width ratios less than 1.9 and 1.8 respectively. Pronotum with about 12 discal setae, median area smooth, posterior margin with a few weak transverse striations. Metanotum with closely spaced striations, campaniform sensilla absent, median setae arising behind anterior margin but varying in position. Fore wing with submedian setae on tergite VIII not extending beyond posterior margin. Male similar to female but head to thorax and fore wing often paler; sternites without discal setae, usually with small scallops along posterior margin.

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