Saicinae, Stal, 1859

Rédei, Dávid & Tsai, Jing-Fu, 2010, A survey of the saicine assassin bugs of Taiwan (Hemiptera: Heteroptera: Reduviidae), Acta Entomologica Musei Nationalis Pragae 50 (1), pp. 15-32 : 16-17

Key to the genera and species of Saicinae occurring in Taiwan

1. Ventrolateral side of head, dorsolateral side of first apparent labial segment, and coxa, trochanter, femur and tibia of fore leg armed with large spiniferous processes. Clypeus armed with a short, anteriorly directed process. ................................................................. .............................................. Gallobelgicus Distant, 1906 : G. heissi Rédei & Tsai, 2009

– Head, labium and fore leg unarmed, or at most supplied with stiff hairs or tufts of setae never inserted on basal processes. Clypeus unarmed. Polytoxus Spinola, 1850 ............ 2

2. Body length 5–8 mm. ...................................................................................................... 3

– Body length at least 11 mm. ............................................................................................ 6

3. Body with conspicuous long and dense, erect to semierect pubescence. ........................ 4

– Body with short ( Figs. 1 and 2 ) or insignificant pubescence. ......................................... 5

4. Pronotum distinctly carinate laterally, with 1+1 dark longitudinal stripes. Basal cell of fore wing connected with two longitudinal veins proximally. ................................................... .................................................................................. P. annulipes Miyamoto & Lee, 1966

– Pronotum not carinate laterally and without dark longitudinal stripes. Basal cell of fore wing connected with one longitudinal vein proximally. ....... P. eumorphus Miller, 1941

5. Head and pronotum with short but distinct pubescence. Pronotum with wide median longitudinal dark stripe occupying both anterior and posterior lobes ( Figs. 1, 2 ). .................. .............................................................................................. P. fuscovittatus ( Stål, 1860)

– Head and pronotum only with short and fine, mostly imperceptible pubescence. Pronotum with different colour pattern, anterior lobe never with wide dark median longitudinal stripe. .......................................................................................... P. minimus China, 1940

6. General body colour testaceous; femora uniformly testaceous; fore wings with extensive dark brown areas and spots. .......................................... P. esakii Ishikawa & Yano, 1999

– General body colour red; femora greatly brown except light base; fore wings without dark brown spots, costal margin red. ................................................. P. rufinervis Hsiao, 1965

Figures

Figs.1–10. Polytoxus fuscovittatus (Stål, 1860). 1 – head and thorax, dorsal view; 2 – same, lateral view; 3 – exposed parts of meso- and metanota, dorsal view; 4 – same, dorsolateral view; 5 – left fore wing; 6–10 – variability of the lengths of humeral and mesoscutellar processes, posterior views (6 – Myanmar, male; 7 – Philippines:Luzon, female; 8 – Malaysia: Sarawak, female; 9 – Philippines: Negros, male; 10 – Philippines: Luzon, male). Scales in mm.