Arocatus, Spinola, 1837

Tsai, Jing-Fu & Rédei, Dávid, 2017, The genus Arocatus in Taiwan (Hemiptera: Heteroptera: Lygaeidae), Zootaxa 4299 (2), pp. 238-252 : 250

Key to the species of Arocatus occurring in Taiwan

1 Dorsum almost uniformly red (except for the brownish membrane), without contrasting dark markings ( Figs. 26–27 )......................................................................................... A. nanus Breddin, 1909

- Body contrastingly bicolorous, red and black...............................................................2

2 Head with a large black median patch between eyes; pronotum black with red lateral margins and with a red median vitta, distinctly carinate along midline; body with long, semierect to erect pilosity (Figs. Figs. 28–31 ).......................................................................................... A. pseudosericans Gao, Kondorosy & Bu, 2013

- Head without dark interocular patch; pronotum black with red lateral margins but without red medial vitta, without trace of carina along midline; body with short, adpressed pilosity ( Figs. 1–6 ).......................... A. elegantulus sp. nov.

Figures

FIGURES 26 – 31. Arocatus spp., dorsal and ventral views. Figs. 26 – 27, A. nanus (Breddin, 1900), male (Taiwan: Hsinchu County); Figs. 28 – 29, A. pseudosericans Gao, Kondorosy & Bu, 2013, female (Korea: Gyeongsangbuk-do); Figs. 30 – 31, same species, female (Taiwan: Nantou County). Scale in mm.

FIGURES 1 – 6. Arocatus elegantulus sp. nov., dorsal and ventral views Figs. 1 – 2, male holotype (“ bright variety ”, Taiwan: Pingtung County); Figs. 3 – 4, female paratype (“ bright variety ”, Taiwan: Pingtung County); Figs. 5 – 6, female paratype (“ dark variety ”, Taiwan: Hualien County). Scale in mm.