Thrips setosus Moulton

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 : 48

Thrips setosus Moulton

( Figs. 194–200 )

Female macroptera. Body uniformly brown to dark brown; antennal segments I to II brown, III yellow, IV yellow with distal half to third brown, V yellow with distal half brown, VI to VII brown; fore wings usually dark with basal fifth pale, clavus pale; mid and hind femora usually brown to dark brown, often yellowish, all tibiae and tarsi yellow. Head ( Fig. 194 ) rounded at cheeks, weakly sculptured within ocellar triangle. Ocellar setae III on margin or outside ocellar triangle, posterolateral to fore ocellus. Postocular setae the longest, longer than longitudinal diameter of hind ocelli, II and IV minute. Antennae ( Fig. 195 ) 7-segmented, II with some microtrichial rows on dorsal surface, III to IV weakly rounded at each side and gently tapering to apex, IV and V pedicelate, VI slightly rounded at each side of basal half and tapering to apex, the longest, with 12 setae. Pronotum ( Fig. 194 ) distinctly sculptured with transverse striae, with 20–24 discal setae; posteroangular setae 2 pairs; posteromarginal setae 3 pairs, setae I about twice as long as others. Mesonotum with CPS anteromedially, lines of sculpture absent around anteromedian CPS. Metascutum ( Fig. 196 ) 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; clavus with apical setae longer than subapical setae. Abdominal tergites III to VIII ( Figs. 197, 198 ) with no lines of sculpture extending to mesad of S1 setae; tergite II with 3 lateral marginal setae, usually without small seta on pleurotergite II near tergite; tergite VIII with posteromarginal comb complete; tergite IX with 2 pairs of CPS; sternites without discal setae; sternite I without microsetae anteromedially; sternite VII with S1 setae far from posterior margin; pleurotergites III to VII with one to three discal setae and no ciliate microtrichia.

Male macroptera. Body almost uniformly pale yellow with middle area between compound eyes shaded, fore wings slightly shaded at distal four-fifth. Antennal segment VI with almost same number of setae as female. Abdominal tergite VIII ( Fig. 199 ) with a few weak posteromarginal comb at middle; tergite IX with S1 setae at level of S2 setae and subequal length to or slightly shorter than S2 setae, their bases equidistant; sternites III to VII ( Fig. 200 ) each with a broad

Comments. This species is endemic to, and distributed throughout, Japan. It occurs widely on plain to mountainous areas. It is well known as a pest of Solanaceae crops such tomato, eggplant and tobacco, and is highly polyphagous. This species is very similar to T. brevicornis and T. typicus by having abdominal sternites and pleurotergites without discal setae. However, it can be distinguished from these two species by the key above. The males of all three species are uniformly yellow but the male of this species is different in being slightly shaded between the compound eyes. Moreover, males of T. brevicornis and T. typicus have many (about 20) setae on antennal segment VI but there are fewer in T. setosus . This species is widely distributed from sea level to mountain areas, but the other two species occur only in mountain areas in Japan.

Figures

FIGURES 194–206. Thrips species. T. setosus, female 194–198: (194) Head & pronotum; (195) Antenna, right; (196) Metascutum; (197) Tergite V & pleurotergite, right side; (198) Tergites VIII–X. T. setosus, male 199–200: (199) Tergites VIII– IX; (200) Sternite VI, sculpture omitted. T. shiranesanus sp. n., female 201–206: (201) Head & pronotum; (202) Antenna, right; (203) Metascutum; (204) Tergite VI & pleurotergite, right side; (205) Tergites VIII–X; (206) Sternite VII.