Astinus siamensis Distant, 1903

Truong, Xuan Lam, Zhao, Ping & Cai, Wanzhi, 2006, Notes on the genus Astinus Stål (Heteroptera: Reduviidae: Harpactorinae) from Vietnam, with the description of the female of Astinus intermedius Miller, Zootaxa 1172 (1), pp. 31-41 : 36-37

Astinus siamensis Distant

( Figs. 7–22 )

Astinus siamensis Distant 1903: 248 ; Hsiao 1979: 253; Hsiao & Ren 1981: 496; Maldonado­ Capriles 1990: 166; Putshkov & Putshkov 1996: 228.

Redescription

Coloration: Body mostly orange to yellowish brown. Clavus, membrane light yellow and semitransparent; eyes purplish brown with irregular pale markings; ocelli light yellow; abdominal beneath with yellow to paler and black longitudinal strips in middle. Body clothed with white wax patches.

Structure: Body oblong. Body clothed short setae and vertical long setae; first antennal segment and basal half of second segment with sparse oblique setae, apical half of second and two distal segments densely covered with oblique short setae; under surface of fore leg densely covered with short setae. Head elongate, postocular portion about 1.5 times of anteocular portion; processes behind antennae short, especially in female; first antennal segment longer than third, second segment slightly longer than fourth; interocellar space much longer than distance between ocellus and eye on each side; first rostral segment extending beyond level of ocelli, thickest and distinctly longer than second and third segments combined. Collar process developed, not bent; pronotum wider than long; anterior pronotal lobe bulging and smooth, tuberculate process developed ( Figs. 9, 10 ); two processes on disk of posterior pronotal lobe ridge­shaped and slightly produced laterally ( Figs. 7–11 ); lateral angle of pronotum sharp, lateroposterior margin convex; posterior angle prominent; scutellum about 2 times as wide as long; hemelytra extending slightly beyond abdominal tip. Apical segments of female as shown in Figs. 12, 13 . Apical 2/5 of pygophore nearly triangular in ventral view ( Figs. 14, 17 ), median process small with apex pointed downwards ( Figs. 16, 17 ); paramere distinctly curved ( Figs. 16–18 ). Basal plate of phallus thicker than plate bridge, pedicel short ( Fig. 20 ); apical part of dorsal phallothecal sclerite slightly warped upward ( Fig. 19 ); struts fused at basal 3/5 and separated apically ( Fig. 21 ).

Measurements [♂ (n=4) / ♀ (n=2)]: Body length 19.93–19.93/20.29–21.50, abdomen width 4.67–5.47/5.18–5.21. Head length 3.20–3.60/4.28–4.72; anteocular portion length 1.07–1.10/1.32–1.37, postocular portion length 1.48–1.86/1.86–1.97; synthlipsis length 0.69–0.76/0.76–0.81; interocellar space 0.55–0.41/0.45–0.52; length of antennal segments I–IV= 8.56–9.00/8.78–7.90, 3.46–3.51/3.51, 8.34–9.21/8.23, 2.10–2.74 /3.40; length of rostral segments I–III = 2.31–2.24/2.42–2.52, 1.31–1.38/1.38–1.40, 0.66–0.72/0.72–0.76. Anterior pronotal lobe length 1.20–1.32/1.54–1.60, posterior lobe length 2.40–2.74/ 2.74–3.20; thorax width 4.67–5.65/5.81–6.13; scutellum length 0.52–0.62/0.69–0.7; hemelytron length 11.33–12.93/13.33–14.26.

Material examined: 1♀, Vietnam, Lao Cai Province, Sapa , 1200 m, 7.X.1995, S. Nomura leg ( IEBR) . 1♀, Vietnam, Mt. Tan Vien , 500 m, 16.X.1995, S. Nomura leg ( IE BR) . 2♂, Vietnam, Phu Tho Province, Xuan Son National Park , 22.X.2004, Xuan Lam Truong leg ( IEBR) . 2♂, Vietnam, Tay Ninh province, Lo Go National Park , 7.X.2003, Xuan Lam Truong leg ( CAU) .

Distribution: China, Vietnam.

Figures

FIGURE 7. Astinus siamensis Distant, ♀. Habitus. Scale bar = 2.70 mm.

FIGURE 8. Astinus siamensis Distant, ♂. Habitus. Scale bar = 2.70 mm.

FIGURES 9–13. Astinus siamensis Distant, 9, ♂; 10–13, ♀. 9, 10. Head and pronotum, antennae partly removed; 11, pronotum; 12, 13, apical part of abdomen; 9, 10, 13 lateral view; 11, caudal view; 12, dorsal view. Scale bar of 9, 10, 12, 13 =1.33 mm; of 11 = 1.00 mm.

FIGURES 14–22. Astinus siamensis Distant, ♂. 14–16, apical part of abdomen; 17, pygophore; 18, paramere; 19, phallus; 20, phallobase; 21, 22, phallosoma; 14, 17, 22, ventral view; 15, 16, 19, lateral view. Scale bar of 14, 15=1.00 mm; of 16, 17 = 0.5 mm; of 18–22 = 0.25 mm.