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) politus n. sp. Figs. 4A , 5I , 7I , 10B . Type material. Holotype (male): GUATEMALA : Departamen-/to de Huehuetenango ,/ 11 km N. Santa Eulalia / on road to San Mateo / Ixtantan ,/ 2865m 5.II>1965/ D. E. Breedlove ” ( CAS ). Differential diagnosis. Body size 6.6 mm . Clypeus dark yellow with the central third darkened to dark brown. Elytra without any detectable serial punctures or striae ( Fig. 4A ). Abdominal ventrites uniformly dark brown; pubescence dense and evenly distributed, the longest hairs shorter than those on the metaventrite. Aedeagus ( Fig. 7I ) 2.5-times longer than its greatest width; apex of parameres rounded, with outer corners widely rounded; inner corners of apex of parameres forming a nearly right angle; lateral outer margins of parameres parallel, slightly constricted near midlength; maximum width of aedeagus at basal half, nearly as wide as maximum width of aedeagus at apical half; median lobe with apex gradually tapering to an acute point. This species is extremely similar to H. laevis , from which it can only be definitively separated by the form of the aedeagus ( Fig. 7I ). Description. In addition to differential diagnosis: pronotum dark brown to black in central half ( Fig. 4A ). Ground punctation on head and pronotum moderately impressed, slightly less impressed on the elytra. Distribution. Guatemala ( Fig. 10B ). The single specimen was taken at a very high elevation ( 2865m ). Etymology. Politus (L), after the smooth elytra which lacks any coarse serial punctures or striae. Biology. Nothing is known about the biology of this species.