Taxonomy of Central American water beetles in the genus Hydrochus Leach, 1817 (Coleoptera: Hydrochidae) Author Perkins, Philip D. text Zootaxa 2021 2021-05-21 4974 3 459 503 journal article 6214 10.11646/zootaxa.4974.3.2 5b4eaeb3-5722-4021-84ad-125ccd80855f 1175-5326 4777839 1BD6220B-7540-4A12-B3D2-5EDC1A3B7DD8 Hydrochus debilis Sharp Fig. 1 , 39 Hydrochus debilis Sharp 1882: 89 . Originally described from Guatemala . New locality data records are given below. Images of the habitus and male genitalia, and detailed description of the male genitalia of the lectotype are given in Perkins (2020a) . Material examined (16) : Belize : Blue Creek Village , 30.vi.1981 , leg. W. E. Steiner (1 NMNH ) ; Belize , 48 km SW Belize City , 5.vii.1981 , leg. W. E. Steiner (1 NMNH ) ; Belize Dist. , Hattieville , 7-8.vii.1968 , leg. W. L. Hasse (6 NMNH ) . Costa Rica : Guanacaste , Naciente de la Qu. Centeno Pocosol , elev. 200 m , 25.i.1997 , leg. T. Goldschmidt (2 NMW ) . Guatemala : Peten , Parque National El Rosario , E of Sayaxche , elev. 145 m ( 16°31’26.9’’N , 90°9’36.32’’W ), 16.x.2017 , leg. R. S. Zack (4 WSU ) ; Parque National Yaxha , ENE El Remate , elev. 167 m ( 17°4’1.99’’N , 89°24’.72’’W ), 13.iii.2017 , leg. R. S. Zack (1 WSU ) . Mexico : Veracruz , Los Tuxtlas area below La Palma , 15.v.1981 , leg. Paul J. Spangler (2 NMNH ) . Differential diagnosis. Among Central American species, recognized by the combination of moderate size (ca. 2.69–3.08 mm ), the densely punctate pronotum with deep foveae, the elytral sculpture, each elytron having four raised interstriae: 3 rd slightly raised over basal ¼, 4 th raised in area anterior to large callus of 5 th , 5 th raised from about anterior ¼ to midlength, plus the usual callus of 5 th , and the male genitalia. The male genitalia are distinctively different from that of other Central American Hydrochus .