Review of the Helochares (Hydrobaticus) MacLeay of the New World (Coleoptera: Hydrophilidae: Acidocerinae) Author Short, Andrew Edward Z. Author Girón, Jennifer C. text Zootaxa 2018 2018-04-09 4407 1 29 50 journal article 22806 10.11646/zootaxa.4407.1.2 8e0aac3a-6556-4b96-a67e-fce9f0db0ba9 1175-5326 3766290 B45E9ABD-CB52-4EE7-91D6-783E8E958AC5 Helochares (Hydrobaticus) laevis n. sp. Figs. 4B , 7J , 10B . Type material. Holotype (male): “ MEXICO : Chiapas / San Cristobal las Casas / 17-21.vii.1964 / leg. P.J. Spangler ”, “grass chocked stream on edge of town” ( USNM ). Paratypes : (5): MEXICO : Chiapas : 20 km NE of San Cristobal de las Casas on road to Tenejapa , Las Ollas , “bog”, 6.iii.1965 , leg. D. E. Breedlove ( 4 females , CAS , SEMC ); same data as holotype ( 1 female , USNM ) . Differential diagnosis. Body size 6.2–6.8 mm . Clypeus dark yellow to orange with the central third darkened to dark brown. Elytra without any detectable serial punctures or striae ( Fig. 4B ). Abdominal ventrites uniformly dark brown; pubescence dense and evenly distributed, the longest hairs shorter than those on the metaventrite. Aedeagus ( Fig. 7J ) 2.3-times longer than its greatest width; apex of parameres truncate, with outer corners rounded; inner corners of apex of parameres forming an acute angle; lateral outer margins of parameres parallel along basal two thirds, slightly constricted at two thirds, diverging along apical third; maximum width of aedeagus at basal half, clearly narrower than maximum width of aedeagus at apical half; median lobe with apex gradually tapering to an acute point. This species is extremely similar to H. politus , with the primary difference being in the form of the aedeagus ( Fig. 7J ). Description. In addition to differential diagnosis: pronotum dark brown to black in central half ( Fig. 4B ). Ground punctation on head and pronotum moderately impressed, slightly less impressed on the elytra. Distribution. Mexico ( Chiapas ) ( Fig. 10B ). Etymology. Laevis (L), after the smooth elytra which lacks any coarse serial punctures or striae. Biology. One series was collected in a “bog”, while the other was collected in a “grass chocked stream”.