Taxonomy of water beetles in the genus Hydrochus Leach, 1817, from Bolivia, Brazil and Paraguay (Coleoptera: Hydrochidae) Author Perkins, Philip D. text Zootaxa 2021 2021-06-28 4994 1 1 93 journal article 10.11646/zootaxa.4994.1.1 1175-5326 5043261 107FCA64-345F-40A4-99D3-5C1441EEAD93 Hydrochus piroei Makhan Figs. 4 , 62 Hydrochus piroei Makhan, 1992: 97 Hydrochus bruggei Makhan, 1992: 102 ; synonymy Oliva (1996) Originally described from Suriname . Additional published locality records are from Venezuela , Ecuador ( Perkins 2019c , 2020b ), and Panama ( Perkins 2021 ). Habitus and male genitalia images are given in Perkins (2019c) . New locality and deposition data for Bolivia and Brazil are given below. A widespread species in South America ( Fig. 62 ). Material examined (41): Bolivia : Beni , Beni Stn. , Palm Camp, NE . of San Borja , 6–9.viii.1988 , leg. Robert W. Brooks (1 SEMC ) ; Tumi Chucua , 16 km . SW. Riberalta , nr. Beni R., 1.x.1970 , leg. W. Fitch ( Stn. 3) (3 SEMC ) ; Santa Cruz , 60 mi. N. Santa Cruz , Saavedra Exp. Sta. , 27–30.xii.1959 , leg. Robert Cumming (13 NMNH ) ; Potrerillos del Guenda , Preserva Natural , elev. 370 m ( 17°40’S , 63°27’W ), 12–13.x.2007 , leg. A. R. Cline (1 SEMC ) ; Prov. Sara , 2 km NW of Santa Rosa , 21.ii.1969 , leg. A. Martinez & R.E. Woodruff (2 NMNH ) ; Santa Cruz , 11–12.v.1969 , leg. P. & P. Spangler (1 NMNH ) . Brazil : Amazonas , 20 km SW Itapiranga , 9.xi.1969 , leg. JM & BA Campbell (1 CNC ) ; Mato Grosso , Corumba -., leg. F. Plaumann [no date] (1 NMNH ) ; Corumba [no other data], ( 17°32’S , 56°27’W ) -. (3 NMNH ) ; Varzea , Grande County , Cuiaba , Parque de Exposicao , 18.iii.1972 , leg. W. H. Whitcomb (1 NMNH ) ; same locality, 30.v.1972 , leg. Roger Williams (1 NMNH ) ; Minas Gerais , Pirapora , 1–30.xi.1975 , leg. M. Alvarenga (1 CNC ) ; Para , Faz. Taperinha , prox. Santarem, PA , 29.xii.1967 – 9.i.1968 , leg. Faz. Taperinha (1 NMNH ) ; Rio Grande do Norte , Ceara-Mirim , ( 5°38’S , 35°26’W ), 6–7.vii.1969 , leg. P. & P. Spangler (1 NMNH ) . Remarks. I have examined the holotype , including the male genitalia, of H. bruggei Makhan , and concur with Oliva (1996) that H. bruggei is a junior synonym of H. piroei Makhan.