Stenchaetothrips biformis (Bagnall)

Masumoto, Masami & Okajima, Shûji, 2013, Review of the genus <i> Thrips </ i> and related genera (Thysanoptera, Thripidae) from Japan, Zootaxa 3678 (1), pp. 1-65 : 10

Stenchaetothrips biformis (Bagnall)

( Figs. 8–17 )

Bagnallia biformis Bagnall, 1913: 237 .

This species is distributed throughout Japan, and widespread in the Oriental region to Europe, Australia and South America. It is known as a pest of rice. Body uniformly brown to dark brown; fore wings almost uniformly brown with a small pale spot near base. Head ( Figs. 8–10 ) prolonged anteriorly, nearly straight at cheeks. Postocular setae I often absent, III much longer than I and the longest, II often slightly behind setal row. Antennal segments III and IV without distal neck ( Fig. 11 ). Metascutum ( Fig. 12 ) without CPS. Mesothoracic endofurca without spinula. Abdominal tergites often with small teeth directed laterally along posterior margin ( Figs. 13, 14 ); tergite VIII ( Fig. 15 ) with posteromarginal comb complete; tergite IX with posterior pair of CPS only; sternites without discal setae, usually with small scallops along posterior margin; sternite I with one or two microsetae anteromedially; sternites III to VII or fewer sternites often each with a small pore plate. In male, body colour similar to female but head to thorax and fore wing often paler than female; abdominal tergites ( Fig. 16 ) with distinct teeth directed laterally along posterior margin, but VIII with posteromarginal comb short teeth-like and directed medially; sternites ( Fig. 17 ) with some microtrichia, pore plates oblong.

Figures

FIGURES 1–17. Stenchaetothrips species. S. amamiensis sp. n., female 1–4: (1) Head & pronotum; (2) Antenna, right; (3) Metascutum; (4) Tergite VII. S. amamiensis sp. n., male 5–7: (5) Tergites VII–VIII, sculpture omitted; (6) Tergite IX, sculpture omitted; (7) Sternite VII, sculpture omitted. S. biformis, female 8–15: (8) Head & pronotum; (9) Postocular setae, setae I present; (10) Postocular setae, setae I absent; (11) Antenna, right; (12) Metascutum; (13) Tergite VII; (14) Posterior margin of tergite VII with large teeth; (15) Tergites VIII to X. S. biformis, male 16–17: (16) Tergite VII, sculpture omitted; (17) Sternite VII, sculpture omitted.