Hydaticus palliatus Aubé, 1838

(Fig. 3B)

Hydaticus palliatus Aubé, 1838: 195; Gemminger & Harold 1868: 466; Sharp 1882a: 665; Branden 1885: 102; Zimmermann 1920a: 223; Blackwelder 1944: 79; Trémouilles 1996: 22; Benetti et al. 2003a: 10; Benetti et al. 2003b: 40; Benetti & Régil- Cueto 2004: 7; Ferreira (Jr.) & Braga 2009: 324; Nilsson & Hájek 2019: 95.

Hydaticus incaustus Aubé 1838; Gemminger & Harold 1868: 465; synonymy by Sharp 1882a: 666.

Hydaticus isabelii Aubé 1838: 187; Gemminger & Harold 1868: 465; synonymy by Sharp 1882a: 666.

Type locality. Brazil .

Material examined. PARAGUAY: “ Paraguay, Dept. Guaira, Calle Florida, 13.-16.II.1993, leg. Drechsel ”, 4 exs., (CGW); “ Paraguay, Guaira Department, Calle Florida, Quelltümpel, 26.viii.1993, U. Drechsel leg.”, 13 exs. , (ZSM) (NMW); “ Paraguay, Zorilla, 16-20.x.1992, U. Drechsel leg.”, 1 ex., (CLH) ; “ Paraguay, Villarrica, Sammlung A. Zimmermann”, 2 exs., (ZSM) ; “Paraguay, Sammlung A. Zimmermann”, 1 ex., (ZSM) . BRAZIL: “ Brasilien, Rio Grande do Sul, Sammlung A. Zimmermann ”, 1 ex., (ZSM) ; “ Brazil, vi.1901, Sammlung A. Zimmermann ”, 3 exs., (ZSM) ; “Brazil, C. L. Müller”, 1 ex., (ZSM); “ Brazil, Manaos, Cachoeirinha”, 5 exs., (NMW) ; “ Santa Catarina, Nova Teutonia, 27°11ʹS 52°23ʹW, 15.XII.1946, leg. F. Plaumann ”, 1 ex., (AMNH) .

Diagnosis. TL 13.0– 13.6 mm; TL-H = 12.2–12.9 mm; MW 6.6–7.3 mm; pronotum testaceous with a narrow black band on the anterior and posterior margin; elytron with sublateral and lateral yellowish stripes, subbasal transverse fascia absent, and with apex largely irrorated (Fig 3B); protarsomere I without a series of spines across the dorsal surface; metatibia with bifid setae curved ventrad basally on posterior surface; median lobe of aedeagus with apex angulate in lateral view (see Trémouilles 1996).

Differential diagnosis. Hydaticus palliatus is very variable in size, between 12.1–15.4 mm (Trémouilles 1996) and can be confused with H. inexspectatus . The two species can be separated by their different colour patterns of elytra and shape of median lobes.

Distribution. Hydaticus palliatus is known from Brazil, Paraguay and Argentina (Trémouilles 1996; Benetti et al. 2003b, 2003b; Benetti & Régil-Cueto 2004; Ferreira (Jr.) & Braga 2009).

Ecology. Knowledge of the biology of Hydaticus palliatus is limited. Trémouilles (1996) reported this species from habitats located in lowlands between 300–700 m (a.s.l).