Thrips brunneus Ishida

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 : 27-28

Thrips brunneus Ishida

( Figs. 82–89 )

Female macroptera. Body uniformly dark brown; antennal segments I to II and IV to VII dark brown, III brown with basal half slightly paler; fore wings pale brown with basal fifth slightly pale; all femora dark brown, fore tibia brown with distal half yellow, mid and hind tibiae dark brown with distal third of inner surface yellowish, all tarsi brownish yellow; prominent body setae brown. Head ( Fig. 82 ) rounded at cheeks. Ocellar setae III at outside or at margin of ocellar triangle, between fore and hind ocelli. Postocular setae I the longest, longer than longitudinal diameter of hind ocelli, II and IV minute. Antennae ( Fig. 83 ) 7-segmented, II with some microtrichial rows on dorsal surface, III subequal length to VI and the longest, III to IV rounded at each side and tapering to apex but without apical neck, IV and V pedicelate, VI with 10 setae. Pronotum ( Fig. 82 ) distinctly sculptured with transverse striae, with 15 discal setae; posteroangular setae 2 pairs; posteromarginal setae 3 pairs, setae I the longest. Mesonotum with CPS anteromedially, lines of sculpture absent around anteromedian CPS. Metascutum ( Fig. 84 ) sculptured with narrow spaced longitudinal anastomosing striae except anteromedially; median pair of setae far from anterior margin; CPS present. Fore wing first vein with seven basal and three distal setae. Abdominal tergites II to V ( Fig. 85 ) with a few lines of sculpture extending to mesad of S1 setae; tergite II with 3 lateral marginal setae, a small seta anterolaterad on pleurotergite II near tergite; tergite VIII with posteromarginal comb complete, but microtrichia wide spaced and irregular length; tergite IX with two pairs of CPS; sternites without discal setae; sternite I with three microsetae anteromedially; sternite VII with S1 setae much far from posterior margin; pleurotergites III to VII with one to three discal setae and no ciliate microtrichia.

Male macroptera. Body colour and structure similar to female ( Fig. 86 ). Antennal segment VI ( Fig. 87 ) with more 20 setae. Abdominal tergite VIII ( Fig. 88 ) with posteromarginal comb small and sparse; tergite IX with S1 setae slightly ahead level of S2 setae and slightly longer than S2 setae, closer to S2 setae than each other; sternites III to VIII each with an oblong pore plate ( Fig. 89 ).

Specimens examined. Holotype female & “ allotype ” male, Urup Is., on Saussurea riederi [ Asteraceae ], 13- viii-1936, Sugihara ( IHU). JAPAN: Hokkaido, Kuchanbetsu, Kamikawa , 1 female (host unknown), 14-viii-2000, Y. Nakatani ( TUA). Honshu: Fukushima Pref., Hinoemata-mura, between Mt. Aizu-komagatake and Mt. Chumon-dake, 1 male on white flowers, 26-viii-2007, T. Mitamura ( FU). Nagano Pref., Taneike: 4 females, 3 males on Solidago sp. [ Asteraceae ], 11-viii-1973, K. Haga ( TUA); 8 females, 3 male on Geranium sp. [ Geraniaceae ], 11-viii-1973, K. Haga ( TUA). Nagano Pref., Jiigatake, 1 female, 4 males (host unknown), 11-viii- 1973, K. Haga ( TUA). Miyagi Pref., Mt. Zao , 3 males on Fraxinus sp. [ Oleaceae ], 10-vi-1976, S. Okajima ( TUA). Tochigi Pref., nr. Satogoya, 2 females on flower of Angelica polyclada [ Apiaceae ], 22-vii-1989, S. Okajima ( TUA).

Distribution. Japan (Hokkaido, Honshu), Urup Is.

Biology. The habits of this species may be similar to those of the most closely related species T. setosus . But this species apparently inhabits northern part or mountainous areas of Japan, whereas T. setosus occurs throughout Japan.

Comments. This species is here newly recorded from Japan. It is very similar to T. setosus , but these two can be distinguished by the key above. However, it is often difficult to discriminate the females, although males of brunneus are dark and have stouter antennal segments and antennal segment VI with numerous setae, whereas males of T. setosus are yellow and have slender antennal segments and segment VI with fewer setae.

Figures

FIGURES 74–89. Thrips species. T. brevicornis, female 74–78: (74) Head & pronotum; (75) Antenna, right; (76) Metascutum; (77) Tergite IV & pleurotergite, right side, female; (78) Tergites VIII–X. T. brevicornis, male 79–81: (79) Antennal segment VI, right; (80) Tergites VIII–IX; (81) Sternite V, sculpture omitted at right side. T. brunneus, holotype female 82–85: (82) Head & pronotum, sculpture omitted; (83) Antennal segments III–VII, left; (84) Metascutum; (85) Tergite V & pleurotergite, right side. T. brunneus. “allotype” male 86–89: (86) Head & pronotum; (87) Antenna, left; (88) Tergites VIII–IX, sculpture omitted; (89) Sternite VII.