Hydrocanthus paraguayensis Zimmermann, 1928

Hydrocanthus paraguayensis Zimmermann, 1928 . Type locality: Paraguay, Apa River. Zimmermann 1928: 166 (orig. descr.);

Blackwelder 1944: 74; Ellenrieder & Fernández 2000: 35; Nilsson 2011: 25. Hydrocanthus (s. str.) paraguayensis Zimmermann, 1928: Guignot 1957: 6; Young 1985: 97; Nilsson 2005: 113. Hydrocanthus (s. str.) paludimonstrus Miller, 2001 Syn. nov. Type locality: Bolivia, Beni, 3.4 km west San Borja, 14°52’57”S

66°56’03” W. Miller 2001: 364 (orig. descr.); Nilsson 2005: 113. Hydrocanthus paludimonstrus Miller, 2001: Nilsson 2011: 25.

Type material examined. Hydrocanthus paraguayensis . Holotype ♀ (Fig. 8). “ PARAGUAY, Apa River, Samml. A. Zimmermann ” (ZSM). Hydrocanthus paludimonstrus . Holotype ♂ (UASC, not examined). Paratypes. “ BOLIVIA, BENI DEPARTMENT, 3.4 km west San Borja, roadside pond, 14°52’57”S 66°46’03”W, 14.VII.1998, Miller K.B. leg” (1 ♀ / UNMC) ; “ 1.7 km east San Borja, weedy pond, 14°52’07”S 66°43’53”W, 15.VII.1998, Miller K.B. leg” (1 ♀ / UNMC) ; “ SANTA CRUZ DEPARTMENT, Velasco Province, San Ignacio, 16°22’21”S 60°57’41”W, 23.VI.1999, Miller K.B. leg.” (1 ♂ / UNMC); “ Velasco Province, 2.0 km south-southwest San Ignacio, cattail pond, 16°23’51”S 60°57’28”W, 24.VI.1999, Miller K.B. leg.” (3 ♂♂ 2 ♀♀ / UNMC) .

Taxonomic notes. The comparison of type material of both taxa confirms that Hydrocanthus paludimonstrus Miller, 2001 is a junior subjective synonym of H. paraguayensis Zimmermann, 1928 . Females of this species can be easily identified for the particular combination of dark reddish-brown pronotum and dark reddish-brown elytra with yellowish marmorations (Fig. 8b), prosternum laterally and medially setose, prosternal process entirely setose except along the apical margin, metaventrite laterally and apically setose (Fig. 2k, 8c), and large size (5.15 mm).