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 astrictus Perkins Figs. 4 , 42 , 54 , 70 Hydrochus astrictus Perkins 2020c: 66 Originally described from Peru . Habitus and male genitalia images are given in Perkins (2020c) , and herein ( Fig. 42 ). New locality and deposition records for Bolivia and Brazil are given below. Material examined (16) : Bolivia : Santa Cruz , 60 mi. N . Santa Cruz , Saavedra Exp. Sta. , 27–30.xii.1959 , leg. Robert Cumming (7 NMNH ) ; Prov. Sara , 2 km NW of Santa Rosa , 21.ii.1969 , leg. A. Martinez & R.E. Woodruff (4 NMNH ) . Brazil : Mato Grosso , Caceres , MT., ( 16°4’S , 57°41’W ), 2–4.xii.1955 , leg. M. Alvarenga (4 CAS ) ; Rio Bento Gomes ( Pantanal ); Flussabschnitt bei Periquito , ( 15°54’S , 56°33’W ), 1.i.1993 – 30.xii.1994 , leg. E. Stuhr (30) (1 NMW ) .